Getting a "a Clock Interrupt was not received..", "IRQL_NOT_LESS_THAN_OR_EQUAL", "System Service Exception" error.

[Fenriss]

first my setup info:

QX6850 w/ Coolermaster Gemini (2 X Aerocool 120mm fan)
EVGA 680i SLI
2GB Buffalo DDR2 PC8000
XFX 8800GTX
4 X Raptors in Raid0
PCP&C 1KW PS connected to an APC 1100va
winXP pro SP2
system is run @ stock speed and never OCed.

started getting "IRQL_NOT_LESS_THAN_OR_EQUAL" BSOD and crashes after i updated my EVGA 680i SLI bios' to P31. i rolled back to P27 (bios i had before the update. system was stable prior to update) but the random crashes still happens.
installed Vista home prem and started getting the "a Clock Interrupt was not received.." BSOD along w/ the IRQ... and other BSOD crashes.
tested the mems w/ memtest, 12 passes w/out errors. swapped it w/ a US mod DDR21066 and ran memtest w/ 10 passes w/out errors. loaded windows and still the BSOD occurs.
temp for the CPU never go beyond 55 and the 8800gtx beyond 70 during load.

any ideas?

 

[robisbell]

what voltage are you running the ram at? I am seeing where the cpu is not cooling down properly and one of the cores is failaing and triggers the "a Clock Interrupt was not received on a secondary processor within the allocated time interval". I'd reverify the voltage the ram is running at and CPU temps. I'd recheck with crucial and kingston as see what the list as 100% compatible ram, and check their specs against the ones you're using.

 

[Fenriss]

initially ran the sticks @ Mobo default before the bios update when the system was stable. after the update when i started to get the BSOD's i upped the Vdimm to 2.1V which was the rated voltage for the Buffalo Firestix DDR2 1000. this didn't help.
switched the sticks to US Modular's Cold Fusion DDR2 1066 and ran it w/ 2.2 VDimm rated then to mobo Default. didn't help and BSOD's continued in both cases. ran Memtest on both sets of sticks. no errors.
i should also point out that the Gemini HSF extends to the ram slots and cools it so heat shouldn't be an issue.

 

[Roguestar]

Crossposted enough?