Prime95 crash, help needed

[Philip Skinner]

My home built PC crashes almost randomly while gaming. GPU tests run fine however a blend test on Prime95 or a large FFTs test causes a crash. The small FFTs test runs perfectly fine. The OCCT and linpack test also cause crashes. I know that the problem is almost definitely hardware related and until the prime95 test i thought my RAM was perfect. I have run memtest86 overnight and there was no errors. I have a suspicion that the motherboard has a problem and cannot handle the loads as individual tests are passed (only when they are combined is there a crash). However it could also be that the ram cannot handle the load. The voltages given by my psu are all just above what they should be and everything is brand new. I have a i5 3570k (stock cooler), ga-z77-d3h, 8gb ballistix sport, 1tb caviar green hdd, saphire hd 7850, ocz 650w psu and windows 7 64bit. ANY advise on tests i should do, or what the cause of the problem is would be much appreciated

 

[ewok93]

Something may be overheating, that's pretty much what Prime95 tests. How is your wire management? Stock coolers aren't great and sometimes come with bad thermal paste.