[SOLVED] whea_uncorrectable_error windows 7 BSOD - HELP

T

TimTam00

New member
Joined
May 6, 2015
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Hi everyone, I've just assembled a new PC and am getting frequent BSOD's with error code 124 (unrecoverable hardware error).
The minidumps are available here:

https://www.dropbox.com/sh/dqwwz0ljbv6vfal/AACgERQ2PPtuLai8V9XesWMRa?dl=0

On day 1, the blue screens were about an hour apart.. now (day two), it blue screens within 30 seconds of Windows loading.

It doesn't blue screen in safe mode.

Sorry, but I'm at work and can't post the system profile. High level:
The motherboard is an Asrock Fatal!ty Killer Z97X with drivers from the CD installed.
CPU is an i7-4790K running at stock clock speed and voltages.
OS is Windows 7 with Windows Update turned on and all updates installed.
I removed the video card (Gigabyte R2 290X) and am using the onboard graphics for now. I uninstalled the Gigabyte software and drivers.

I picked six minidumps at random, and consistently the error is:

FAILURE_BUCKET_ID: X64_0x124_GenuineIntel_PROCESSOR_CACHE

The specific errors were:

Error : DCACHEL0_EVICT_ERR (Proc 6 Bank 1)
Error : DCACHEL0_EVICT_ERR (Proc 6 Bank 1)
Error : DCACHEL0_EVICT_ERR (Proc 6 Bank 1)
Error : DCACHEL0_EVICT_ERR (Proc 6 Bank 1)
Error : DCACHEL0_EVICT_ERR (Proc 7 Bank 1)
Error : DCACHEL0_SNOOP_ERR (Proc 7 Bank 1)

I stripped the system to bare bones: mainboard, 16GB RAM, CPU + cooler, one drive (OCZ Vertex SSD), 850W power supply, PS2 keyboard, USB wireless mouse.

Is it a bad CPU? Or could there be something else wrong?
 
Correct, it doesn't blue screen is safe mode. I recall reading many years ago that safe mode disables the CPU cache, is that right?
 
I'm looking into the EVICT and SNOOP error types.

The EVICT request type means that an error occurred during the cache eviction process, the SNOOP request type indicates that an error occurred during a snoop operation, which is one of the methods used to maintain cache coherency. It seems there may be a problem within the caching process.
 
I concluded that it was a bad CPU, and exchanged it for another one. Problem solved. Looks like the CPU was faulty!
 
FYI the Lx Cache on the CPU is Physical memory on the CPU die there is no way to increase it's size through software.
 

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