@Ciggavelli
If you're going to run a Primetest then I advise you follow the instructions/settings laid out under The Prime Test in this thread,
http://www.overclock.net/t/1198504/...sandy-bridge-ivy-bridge-asrock-edition/0_100#
To take memory completely out the equation nothing beats a few hours of MemoryTest86+ like DF suggested. 1 hour though is too short a test since errors can come up hours after. I'd run it overnight if you wanted to really make sure it isn't ram.
Hard lock ups are usually CPU / Ram related. It would be rare for it to be the CPU if you're not overclocking. If your GPU's are factory overclocked you can try to increase their voltage a bit though unstable gpu clocks usually just cause driver crashes or game lock ups, not complete system lock ups.
If you're going to run a Primetest then I advise you follow the instructions/settings laid out under The Prime Test in this thread,
http://www.overclock.net/t/1198504/...sandy-bridge-ivy-bridge-asrock-edition/0_100#
To take memory completely out the equation nothing beats a few hours of MemoryTest86+ like DF suggested. 1 hour though is too short a test since errors can come up hours after. I'd run it overnight if you wanted to really make sure it isn't ram.
Hard lock ups are usually CPU / Ram related. It would be rare for it to be the CPU if you're not overclocking. If your GPU's are factory overclocked you can try to increase their voltage a bit though unstable gpu clocks usually just cause driver crashes or game lock ups, not complete system lock ups.