Right, ran Prime95 with stock DRAM settings (667Mhz) and it got through without BSOD!
So, it would appear the issue is RAM related when I try running it at its correct (1600MHZ not 1333MHZ) speed.
Any suggestions? This is it currently:
This is what CPU-Z is showing for the i5, with BIOS defaults:
Isn't the Vcore high? Note: this was during a Blend test run...
EDIT: So, when BIOS Optimized Defaults are loaded, Prime95 runs fine. When XMP Memory Profile is selected, I get WHEA_UNCORRECTABLE_ERROR. I went into BIOS and used your settings Shankly, so timings: 9-9-9-27 and DRAM Voltage 1.575. Got into Windows, fired up Blend test and instantly WHEA_UNCORRECTABLE_ERROR Blue Screened. I then tried the manufacturers settings for 1600MHZ (the XMP-1600 column on the SPD tab), which meant upping the voltage to 1.65v, and that also Blue Screened.
So it looks like running the RAM at its correct speed is causing this...which is odd, because on my old PC I had all 16GB running at 1600MHZ using an XMP Profile and that was fine.
I then reverted the RAM to BIOS default; and thought I'd try OC'ing the CPU by its self, so set the multiplier to 38 (3.8Ghz). So this was with the CPU @ 3.8Ghz and RAM @ 667Mhz, I ran Prime95 Blend and Blue Screened almost instantly! So that was without touching the RAM settings - is this an issue with the CPU, or is the CPU overclock linked to the RAM in some way?
Full system specs:
i5 3570k (running at completely stock)
16GB PC3-12800 Kington HyperX Genesis Grey (having to run at PC3-10700 to prevent BSOD'ing
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Gigabyte Z77X-D3H
Gigabyte 7970 GHZ
Agility3 120GB SSD
XFX 850w PSU