Crash when Stressing Cache (Gigabyte Z87X-UD3H + Core i5-4670K)

[King_Colbra]

Hi all

Been having computer stability issues for a while so decided I would try and see if my computer is stable from the get go. my system had 2xATI 7870 but have removed them and now just running with the IGP, switched from an SSD to two different mechanical HD's, changed power supplies from a Antec 1000W to a new Antec 750W, installed fresh installs of Windows 8, tried a fresh install of Windows 8.1 then tried a fresh install of Windows 8.1 with update, and now running windows 7 64bit. I've ran Memtest86+ for 5 passes and had no issues, also tried running each stick on its own with AIDA64 but still get the same computer crashes/reboots. I've tried setting the CPU core voltage to 1.15V and the ram at XMP and 1.5V, tried each on their own. Currently everything is at the BIOS defaults. Both Windows 8.1 and Windows 7 give me the error Bugcheck code 0x124 in Whocrashed. Which it says is a fatal hardware error which might be caused by a thermal issue. My room is sitting at about 15-18 degrees, CPU temp never reaches about 63 degrees.

 

My computer has the follow;

 

Intel i5 4670K

Gigabyte GA-Z87X-UD3H - run both F9 and beta 10B bios with same issues but stuck with the F9 bios

16GB GSkill DDR3-1600 (2x8GB)

 

When I select stress CPU, FPU, CACHE, memory and GPU, my computer would reboot anywhere from 7-8hours mark. Over the last few days I started to test each component individually in AIDA64. I started with the CPU and worked down. Both CPU and the FPU stress tests lasted 22+ hours before I stopped them. The system is crashing 3-4 hours when stressing the cache (tried 2 twice now).

 

So what is the cache stress actually stressing on the CPU? Does the test prove its the CPU that is at fault or is it the motherboard? Its a bit hard to convince friends to let me pull apart their working system so I can take parts and stress them for a few days.

 

[Fiery]

So what is the cache stress actually stressing on the CPU?

It simply does the same thing as the memory CRC checking, but with such block sizes that would fit in the L1, L2 and L3 caches of your CPU. So it heavily stresses all CPU caches. In your case, considering how many things you've tried to replace in your system, I'd say it could either be the CPU or the motherboard. Out of those two, I'd start with trying a new CPU. It could be an affordable Celeron as well, you could probably borrow one easier than a high-end Core i5/i7 part.

Regards,

Fiery