Hi.
As for the first part in BIOS Setup > System Information, we have:
Video Controller = Intel(R) kabylake Graphics
dGPU Video Controller = AMD Radeon R7.
Even though, every Windows 10 system info program I used says intel 620.
Second part, the models you wrote are not the same as my HDD. I visited Seagate's web and to download new firmware it requested my HDD's serial number. When I entered it, it said there is not new firmware.
And at last, does this mean I need to get some overclocking software? Because all I found with Googling is RAM overclock. I couldn't find that option in the DELL BIOS.