Hi, long time reader first time poster. Been getting the old IRQ_NOT_LESS_EQUAL BSOD since I upgrade my motherboard and cpu. If I run Prime for more than 10minutes and my pc BSOD's with either (the infamous) 'IRQ_Not_Less_Equal' or 'Memory Management' (normally 0x9D728CC0 0x000000002 0x00000000 0x805ODF62) errors. Happens in some games like BF2 as well. What I have tried to do.. and nothings helped -Reformatted -Updated bios -Removed 1 memory stick -Ran at stock/default speeds -Ran at overclocked speeds -Tried different timings -removed and uninstalled soundcard -Ran Memtest for 14 hours with no errors -resecured all wiring -Cleaned out case of dust -updated video drivers -increased cpu volts -decreased cpu volts -upted ram volts -defragged -scandisked -virus scanned/spyware scanned -uninstalled virus scanner (AVG) This has all started since I installed a new motherboard/cpu (MSI NF3 Neo 2 Platinum and a Opteron 146). System is running DX9c No conflicts in Device Manager XP Pro SP2 Audigy 2 ZS X850XTPE 1gig Corsair DDR400 Value Select (had 2 gig but removed other stick) Antec True Blue 480w psu (6 months old) I have a Vapour Cool Micro thats on the cpu and it also cools the ram, system temp never goes over 52c in the torture test. I'm pulling my hair out... any help really welcome Included 2 memory dumps.