Low IOPS with Samsung 950 Pro 256GB on AMD system.

hurricane28

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Joined
May 25, 2016
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The Neterlands
Hello everyone, I am new to this forum so if i do anything wrong plz point it out to me and i will correct it. forgive me my bad English too because its not my native Language but i try my best to make you understand.

I have a weird problem which i don't understand and hopefully someone on here can provide me the correct answer.

I have Gigabyte 990FX Gaming G1 with an M.2 slot which is populated by an Samsung 950 Pro 256GB SSD and when i am doing an benchmark i get lower IOPS than on my previous Samsung 840 EVO SSD.
The problem began with upgrading to an 850 Pro SSD and ever since i get lower IOPS with the newer drives.

When i had the 840 EVO, i was getting around 100K IOPS which is the correct amount i should see but on the 850 Pro and the 950 Pro i get around 75K IOPS random read and around 65K random write IOPS.
I know that i will never see the advertised speeds of this SSD since i am only running PCIe Gen2 but still, the IOPS are rather low and are not constant. One day i get around 80K random read and 70K random write and after an reboot or cold boot i get 70K random read and 60K random write..

This is a bit strange to me so hopefully someone can help me with this? If you need any system information pls let me know and i will provide as much info as i possibly can.

Thanks in advanced!
Regards,

Hurricane28.
 
I stopped running benchmarks because of the apparent random, non-consistent results between different benchmark programs, and between runs with the same program. Plus, benchmark programs are designed to stress devices. They don't represent real-world scenarios. All they really do is increase wear and tear on your hardware and maybe provide bragging rights.

I do note Samsung (and all the others too) state their performance specs in terms of "Max" values. And there are many variables that affect results. Have you used Samsung Magician to change any settings? I note some users reported lower scores if "Write Cache Buffer" was disabled. I have Samsung SSDs in my systems and I don't use Magician. W10 knows how to use SSDs just fine and Magician was preventing my computer from going to sleep. I "saw" no difference after uninstalling Magician so why have a "man-in-the-middle"?

None of your values are bad by any measure. I would not go by "synthetic" results of benchmark programs but instead, your own perceptions. Do make sure your drivers are all up to date, your system is clean of malware, and you are not running low on free disk space. Otherwise, I would not worry about it. And let's face it, even slow SSDs are really, really quick!
 
Thank you for your quick answer!

I guess you are right, synthetic benchmarks are always an disappointment because the scores are never the same no matter how hard you try... It's not that there is something slow or anything, this is really a BEAST of an SSD to be honest so no complaints there, i just wondered if there could be something wrong but it clearly isn't.

I do have another problem with the SSD and that is whenever i reboot or boot the system, i get: Reset to device, \Device\RaidPort1, was issued. I tried different drivers and even mod the registry without any result and the warning message keeps turning up.. Is there anything to worry about and is there a way to solve this issue? Could it also be IOPS related?

Thnx in advanced!

This is the best forum i ever visited to be honest! Lots of very good information can be found here and there are people here that actually have an idea what they are talking about.
 
Well, I have an SATA 3.0 850 Pro and an 850 Evo in this system and neither perform as well as the "Max" specs suggest using AS SSD Benchmark. But when I look at the whole computer, it blows the socks off of any other computer I've had, including my last i7 build and this one has an i5. This one also uses DDR4 and 850 SSDs vs 840s and DDR3. While my graphics card is not a top end, it is okay and only a small improvement over the old one. But all together make this computer scream.

It takes less than 7 seconds to totally come out of sleep mode, which still amazes me every time. Boot from total power off state is less than 20 seconds. I have a 63 page, 20,000+ word Word document I use for canned texts and other references when helping out on forums. I made a shortcut to that doc and put it on my QuickLaunch toolbar. With MS Word not running, when I click that document's shortcut, it "pops" open. I mean seriously, in less than a second, Word starts and my document are open and ready for me to edit, find a reference or copy some text. And that is by far mostly due to the 850 Pro Word and that doc sit on.

I have never seen that RaidPort error but according to Google, others have. But there does not seem to be on standard fix so you look through those results to see if something helps.
 
Yeah, those SSD's are fast man. The 850 Pro i had was booting very very fast as well and programs load pretty quick. Booting was dealt with within 20 seconds and i could use my system immediately, simply stunning performance. Now, my 950 Pro boots slower but all apps open instantaneously i mean, seriously man, even Adobe Premiere pro takes only 5 seconds to boot.. Its not only programs but games also load very quick, its much faster than my 850 Pro i had so big upgrade there.

About my RaidPort error, i searched all over Google and couldn't find any useful information about it, i tried several "fixes" but nothing worked unfortunately.

Now, i have an different problem. My PC shuts down randomly no matter what i do.. it doesn't completely turn off and i can see that my motherboard and Corsair H100i GTX is still running and there is 65 watts being pulled from the wall (i have an watt meter between the wall and my PC) When i go to Windows log, i can't see anything that indicates this problem.. I start to suggest its my PSU again but that's a little weird because that means that this is the second one in only 1 year time.. I am having Cooler Master V850 which is among the best out there. Can it be my CPU that is going bad or something and that also explains the low IOPS? I heard from people that CPU's don't die that often and if they do they will just fail, but in my experience there can be all kinds of things go wrong with a bad CPU..
 
I heard from people that CPU's don't die that often and if they do they will just fail, but in my experience there can be all kinds of things go wrong with a bad CPU..
Well, I agree with the people you heard from. Typically, when a CPU fails, it just dies completely.

BUT - heat can sure make it unstable.

65W with the computer turned off (that is, in standby mode) is WAY too much. With my computer awake but idle, if I turn off my monitors, the LCD display on my UPS shows I am using just 55W, and that includes my cable modem, wireless router, and 4-port Ethernet switch. So something is not right with your system and if me, I always start with power. Until Man can create perfection 100% of the time, even the best PSU makers can produce a sample the that fails prematurely. Or perhaps there is something else wrong with your system that is taking out PSUs! :(

Depending on your motherboard, you might be able to check your voltages in the BIOS Setup Menu, typically somewhere under PC Health. Otherwise, check the Sensors using HWiNFO64. They should be within ±5% of +3.3V, +5V, and +12VDC. Don't worry about the negative voltages - modern motherboards don't use them. And if the voltages look "impossible", they probably are. Some HW monitor/info programs just don't read the sensors on some motherboards properly.

Speccy (from the makers of CCleaner) is one of my favorite HW info programs, but it reports my +12V is +.048V and my +5V is 3.2V. A computer would not work the voltages were really that far off.

HWiNFO says +12.168V and +5.010V. Much more believable, and reassuring. You might also consider a PSU Tester. I keep one of these in my tool bag in my truck for house calls. The advantage of this model is that it has a LCD readout of the voltages. With an actual voltage readout, you have a better chance of detecting a "failing" PSU, or one barely within the required ±5% tolerances.

These testers are not 100% conclusive however, because they only have a single and small "dummy" load. They don't present a variety of realistic loads needed for a conclusive test. Nor do they (or most multimeters either) test for ripple and other AC anomalies riding the DC that can affect computer stability. Therefore, conclusively testing a power supply is done in properly equipped electronics repair facilities by a qualified tech using an o'scope or power supply analyzer. That typically leaves swapping in a know good PSU for most "normal" users as their only real option to conclusive verify a PSU either works properly, or doesn't.
 
Okay, i thought maybe when a CPU starts to fail, that means if some cores don't work properly anymore, it can lower my IOPS but i guess i am wrong.

Heat is not an issue here, i am running Corsair h100iGTX and my temps never get higher than 55c under full load, also my VRM's don't get hor either. I have 1 120mm Corsair sp120L fan blowing on the back side of the socket in order to properly cool this CPU (volcano) I also have 2 80mm fans blowing on the VRM's and when i am working in Adobe or something very demanding i always monitor my temps very closely with HWINFO64.

I have AMD system which is much more power hungry than Intel systems, maybe that explains the high standby wattage? BTW, i discovered its my PSU that starts to die on me.. I remember that with my previous PSU i had the same exact issue when it died.
Strange thing is is that this PSU is not even 8 months old.. This is actually the 3rd Seasonic made PSU that died on me within 4 years.. I lead to believe Seasonic makes the best Power supplies but i am not so sure anymore since my experience is very different. IF there is an PSU eating component in my System, it must be the CPU since that is the only one that is not brand spanking new in my system. The rest is relatively new. I bought new motherboard a couple of months back same with new RAM and my cooler also died and got a new one from Corsair. The only think i can think of that can cause my PSU's to die is my watt meter which is in between my wall socket and the PC.. Could that be the problem?
 
Okay, i thought maybe when a CPU starts to fail, that means if some cores don't work properly anymore
That's very rare a CPU with a bad core would make it out the factory undetected. There are CPUs that come with cores disabled at the factory and marketed as CPUs with fewer cores. But I've never seen a CPU that still functioned that suddenly reported a dead core.
and my temps never get higher than 55c under full load
55°C under full load is really good. I agree, no problem there - at least with the CPU. The problem with alternative cooling solutions is they sometimes fail to provide adequate cooling for the sensitive devices surrounding the CPU, including the voltage divider/regulator circuit components and the chip set devices. So make sure your "system" temps are good too.

I lead to believe Seasonic makes the best Power supplies
They certainly have a reputation for quality PSUs.
IF there is an PSU eating component in my System, it must be the CPU
Not true. Any failing component (new or old) can develop a short or low resistance situation. Ohm's Law (I=E/R) states in a DC circuit, if the voltage (E) remains constant and resistance (R) drops, current (I) must go up. And Power (W) = IE. So if current goes up, so does the wattage.

I don't see how a wattmeter can damage a PSU. But lousy power from the grid can beat on a PSU and cause damage. I generally recommend ALL computers be on a good UPS with AVR. Surge and spike protectors are little more than fancy and expensive extension cords - better than nothing but they do nothing for low voltage anomalies. And for high voltage anomalies, they just chop off ("clamp") the tops of the waveforms leaving very ugly and dirty power for the PSU and motherboard regulator/filter circuits to clean up. That cleanup process is stressful and generates extra heat. I've not seen any wattmeter that provided any surge and spike protection.
 
Okay, well thanks for the clarification i am certainly no expert so any feed back is welcome. I know something but i am certainly no expert.

Yeah, i am using the Corsair H100i GTX with Noctua NF-F12 Industrial PPC 3K RPM fans and they blow a lot of air and have an amazingly 7.4mm H20 static pressure. Cooling is not a problem here. Yes i noticed that my VRM, (voltage regulator modules) can get really hot even with my previous Asus Sabertooth motherboard so i always have 2 fans blowing on them in order to keep them from cooking or can cause throttling issues, so no problems with cooling. I also monitor my system very closely with HWINFO4 in order not to let the system run too hot.

Okay, well the rest is new except for the CPU. I don't have UPS but maybe its a smart idea to buy one instead. I will need to investigate this more. I called Cooler Master and they will replace the unit next week and they will test it for me in order to determain what is causing this.
 
As far as UPS, in terms of quality, it is hard to beat APC. I used this one and it easily supports my i5-6600, 2 x 8GB RAM, 2 SSDs, and decent graphics, plus my router, modem and 4-port switch, my phone, and "two" 24" monitors.
 
Thanks, after some testing i think its not PSU related to be honest.. I was running 257 FSB before that gave me 2570MHz CPU/NB and 2827MHz HT and i guess it didn't like it, for some reason motherboards have dead spots when it comes to FSB overclocking..
Now i set the FSB to 260 which result in 2600MHz CPU/NB and HT and its much happier now and i didn't have the shutdowns anymore.. i still investigating through tests but things look promising..
 
for some reason motherboards have dead spots when it comes to FSB overclocking..
Not sure what you mean by dead spots. Certainly, stability issue can arise if components are stressed, get too hot, subjected to abnormal or out-of-tolerance voltages, or just bad timings.
 
Its well known that some AMD FX boards have so called "dead spots" in the FSB, which means that it can't run at 257 but can at 260 which is only marginally higher. Yes i agree, i never had this issue though so i was kinda worried that it was my PSU but so far everything goes well. Temps and voltage are no issue in my case so it must be an misconfiguration or something. Keeping my fingers crossed..


Thank you for your time though, much obliged.
 
Its well known that some AMD FX boards have so called "dead spots" in the FSB
Ummm, no. It is not well known or else it would be widely publicized and clearly, it is not as seen (or not seen) here.
 
Well over at overclock.net where there is a FX-8350 thread people reported of these FSB dead spots which happens on different boards. I tested this myself with my previous Sabertooth and Gigabyte boards and they all tin to have FSB dead spots for some reason. As an example, i can't boot at 300 FSB with 4.8 Ghz CPU, 2400 MHz ram and 2600MHz for CPU/NB and HT but i can with 260 FSB. That is what i mean with FSB dead spots.
 
Yeah, I understand what you are saying. I am just saying the problem is not as widespread or well known as you suggest. I've been a member there since 2011 and while I don't participate there, I lurk about and follow the hardware trends there and many other sites too. And frankly, I cannot find any "recent" reference to any dead spot that does not refer to air flow or wifi. There may be some, but the point is, not many.

Regardless, I do believe you when you say you have encountered a dead spot. I am just saying that is a rare occurrence that does not indicate a trend, pattern or well known event.
 
Okay i understand. I do remember reading it in the official FX-8320/8350 thread and on several others.

It happened again an hour ago.. My PC shuts down out of nowhere when i was doing in Internet speed test.. Temps are fine and voltage too. I checked the voltage in the BIOS and all is well except HWINFO64 is reporting weird voltages which are not corresponding with the voltage i see in BIOS. When i was looking in Windows log i got event 41 Kernel-power again with the following message: "The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."

How do i determain that is the cause without having any spare parts or very limit tools to work with? I still suspect the PSU because its completely random and i never had this problem before, it just happened without me changing anything.
 
Well, that is not the "official" anything! The only "official" FX-8320 sites are here and at the makers sites for the specific motherboards that support that FX series. Now if you can find an "official" KB (knowledge base) article at AMD or Gigabyte, ASUS, or another motherboard maker that discusses those "dead spots" with that series of processors, I would be very interested in reading up on them.
It happened again an hour ago.. My PC shuts down out of nowhere
When pushing clocks beyond published specs, it is not "out of nowhere". You need to reset all your clocks back to default levels, then see if your system is stable.

I checked the voltage in the BIOS and all is well except HWINFO64 is reporting weird voltages which are not corresponding with the voltage i see in BIOS.
Well, without telling us what those weird voltages are, we cannot help with that. I will say that there is no industry standard for sensors. Motherboard makers can put them anywhere they want, or not use them at all. And note it is not uncommon for HW monitoring programs to report "weird voltages" when reading a non-existent sensor.

If your voltages are within the ±5% tolerances allowed (11.4 to 12.6VDC, 4.75 to 5.25VDC, and 3.14 to 3.47VDC) as shown in the BIOS and HWiNFO64, then that is good. But note running the BIOS Setup menu is probably the least demanding task we can ask of our PSUs. Displaying HWiNFO64's results is hardly demanding either. To conclusively verify a PSU, it must be done on a variety of loads, up to 100% load.

How do i determain that is the cause without having any spare parts or very limit tools to work with? I still suspect the PSU because its completely random and i never had this problem before, it just happened without me changing anything.
You really can't. That's why troubleshooting problems is the hardest, and most time consuming aspect of electronics repair. It can take hours to find the problem, then just a few minutes to actually fix it. This is also why technicians really don't like giving out estimates. The man-hours involved in determining the problem to make an estimate is 90% of the entire job. This is why many techs charge for estimates, then apply that charge to repair if you let them repair it. Other wise, they waste their most expensive (in business terms) resource, their time.

I still suspect the PSU because its completely random
That's another part of the problem because the shutdowns are NOT random at all! It is just that we (humans) don't see a pattern. If we don't see a pattern, we cannot duplicate the scenario at will. And if we can't duplicate the scenario at will, it is very difficult to troubleshoot.

Technicians also don't like to swap in parts just to see if that fixes the problem for fear the faulty system will destroy their spare parts. They would much rather use test equipment and bench mock-ups. But good test equipment can be expensive and often requires you to be a qualified technician to use and understand the results. And there just isn't a bench mock-up that support the 1000s and 1000s of different motherboards out there repair shops may encounter. Even the factories retool their mock-ups for different models once production of that particular model (or its warranty) ends.

So swapping in known good spares is really the only course of action left for many techs and enthusiasts alike. So again, I recommend you reset all clocks and setting to the defaults, then borrow a PSU from a trusting friend or family member and see how your computer works.

You should also test your RAM. I recommend MemTest86. Allow the diagnostics to run for several passes or even overnight. You should have no reported errors.

Alternatively, Windows 7, 8 and 10 users can use the built in Windows Memory Diagnostics Tool.

Note, however, that software based RAM diagnostic tools are good, but none are conclusive. So you might try running with just a single RAM module to see if it fails. Repeat process with remaining modules, hopefully identifying the bad stick through a process of elimination. Just be sure to unplug the computer from the wall and touch bare metal of the case interior BEFORE reaching in to discharge any destructive static in your body.

Going back to what I said before, note to conclusively test your RAM, you need to use sophisticated and very expensive test equipment, like this $4,000 Eureka Express DDR3 DIMM Memory Module Tester. Obviously these are something only very large repair facilities can afford. So again, risking damage, swapping in spare RAM is often the only recourse even for many techs in smaller shops. :(

In case this is heat related (perhaps a component that does not have a sensor), you could also try opening the side panel and blasting a desk fan in there.

I am still concerned your system is drawing so much power (65W) when the system is shutdown, and in standby mode. Your 65W in at least 3 times higher than it should be. I just did some testing with my computer using the power meter on my UPS to measure power consumption. I "shutdown" the computer and saw that I am drawing about ~16W. I booted completely then put the computer to sleep. I use and recommend "Hybrid" sleep mode for all PCs (not notebooks). Windows "hybrid" sleep mode is ideal for PCs - especially those with UEFI BIOS and DDR4 RAM, which this computer has. When in Sleep mode, my UPS shows just 18W of power is being consumed. That extra 2W is due to some data is being maintained in my RAM using the "low voltage" state DDR4 supports to allow for faster wakes.

Note too, some of that 18W comes from my modem, wireless router and 4-port switch which are also protected by my UPS. All other connected devices in the house were turned off for this test to minimize power demands on those network devices. So in reality, I suspect my actual computer power consumption when shutdown and in standby mode would be closer to 5W, or even less considering the power adapter rating for my wireless router alone is rated at 12W!

Power consumption of DDR3 in standby can be expected to be a bit higher than DDR4, but not a lot more. And certainly, when the computer is shutdown and the PSU is only providing a very minimal amount of +5Vsb standby voltage, the power consumption should be near nothing, not 65W. :(

So this could be the PSU, or something in the computer pulling power when it shouldn't. You could use one of those testers I noted above to power up the PSU out of the computer then use your kill-a-watt meter to see what is doing. You could also use the "paper-clip" method. I don't really like this method because it puts zero load on the supply and PSUs don't like that. But for this test, it might be telling.
 
I know its not "official" its just how the thread is called, i should have clarified that sorry.

Well, it did happen out of nowhere because i did the same exact thing over and over again without any problem, i did run benchmarks and several stress testing programs without any problem at all. I first used IBT AVX but that doesn't even stress the system well enough because i only see temps in the 55c range while i am rendering/exporting in Premiere pro or run realbench, i see temps up to 62c.. which is still way below max temp of 72c. That is why i don't really like stress test programs since they put unrealistic load on the system. I was IBT AVX stable so to speak but i crashed after playing Crysis3 within an hour.. while i was stable at IBT AVX at maximum for over 20 runs. Now, i am not saying that stress testing programs are bad per say but IMO its better to test with different programs and definitely Premiere pro since it stresses the system like no other program i know of so if there is something not stable, it will find it and it will find it pretty quick i noticed.

I did run memtest before and let it run overnight and it found no errors. I have no spare parts and in my city there is no PC retail store anymore unfortunately :( the shop i bought it from is almost 100 KM from me and since i have no car that's no option.
I will replace the PSU and hopefully it solves the problem.

I did open the side panel and have fans all over the place in order to be sure nothing gets too hot, i even have a 120mm Corsair SP120L fan blowing on the back side of the socket and vrm's and temps dropped almost 20C! So that really makes a huge difference.

Regarding the high wattage being used when shut down, i don't know if it makes any difference but i am on an very very power hungry AMD system, these systems eat watts and volts like there is no tomorrow, seriously, when i run real bench i saw that there was 562 watts being pulled from the wall! That is what most Intel i7 systems draw with SLI configurations lol I called Cooler Master and they said it must be the PSU so i decided to do an RMA service from them.
I also looked on the Internet with similar problems and 90% of the users were reporting that it was the PSU that caused this.

I don't know man, it looks like i have to swap my PSU and hope for the best if it didn't work and i still have these "random" shut downs, i RMA my ram and go from there.. there is no other option in my situation unfortunately. I do want to point out that today my system is working perfectly well.. i ran OCCT for an hour and real bench for an hour after that but it was doing just fine.. i also worked on some projects in Premiere Pro with no problems at all.. go figure..

Below i posted some images of some benchmarks, HWINFO64 screen shots and IBt AVX screenshot in order for you to look at and perhaps you can see something i don't, to me it looks pretty normal but let me know if you find something strange.


PSU voltage.png
Samsung 950 Pro benchmark.jpg
System.jpg
4.88 Ghz Stable.jpg
950 pro.jpg
The following image is one i got from a guy over at overclock.net and as you can see the SSD benchmarks are rather different. I get higher random read/write speed but he gets higher IOPS..
Johan45 correct IOPS.jpeg
The following image is the Windows log error i get with this SSD:
windows Nvme error.jpg

I tried everything and there seems no solution to this error, it seems that the Samsung Nvme driver is causing problems because i didn't get it when i had the Microsoft driver installed.
 
Regarding the high wattage being used when shut down, i don't know if it makes any difference but i am on an very very power hungry AMD system
It does not matter how power hungry the CPU is, when the computer is shut down, the CPU should be drawing nothing. Even in standby, the CPU is doing nothing.

I called Cooler Master and they said it must be the PSU so i decided to do an RMA service from them.
This is happening now? Or did you already get this replacement and have the same problem?

i RMA my ram and go from there..
While Memtest is not conclusive, you did get no errors. Did you try running with 1/2 your RAM at a time?

If this were years ago, I would also suggest you inspect your motherboard for leaky or bulging electrolytic capacitors. Most motherboards now use solid caps. But you still might inspect your board to make sure all look good.
 

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