It may well be the CPU. Not all Haswell clock well. Infact most dont. Run it where it is stable.
Managed to get stable in games that is lol and over 2 hours of aida32 bench .....
though my graphics are still flakey, i can play other games but splintercell always dx11 crashes
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event log:
Faulting application name: Blacklist_DX11_game.exe, version: 0.0.0.0, time stamp: 0x52069460
Faulting module name: atidxx32.dll, version: 8.17.10.514, time stamp: 0x520cc3b9
Exception code: 0xc0000005
Fault offset: 0x00070f17
Faulting process id: 0x1ff8
Faulting application start time: 0x01cea6acfe555ce5
Faulting application path: G:\BLACKLIST\src\SYSTEM\Blacklist_DX11_game.exe
Faulting module path: C:\Windows\system32\atidxx32.dll
Report Id: bd268f32-12a3-11e3-8298-94de806e97f6
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seems graphics card related though i can play other games and no issues, played bf3 tonight for over a hour no issues.
though i gave it a try just for kicks, i enabled splintercell dx9 mode with everything maxed out and the game works

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now did you managed to take a look at the green venom set i bought for settings to try, also i have a spot cool 100 on the memory and there ice cold

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got this new set setup with xmp 2133 with T1 enabled and no errors in memtest86+ so need some settings to test out

cheers