RMA motherboard,ram,graphics card?

[judmann]

motherboard:EVGA nForce 680 (Socket 775) PCI-Express DDR2 Motherboard

Ram:OCZ 2GB (2 x 1GB) PC2-8500 1066MHz SLI-Ready Edition Dual Channel DDR2 (OCZ2N1066SR2GK)

graphics card : BFG GeForce 8800 GTX OC 768MB GDDR3 HDTV/Dual DVI (PCI-Express)

when i change my settings to sli max in bios in vista i keep getting driver display error nvlddmkm.
when i un-installed the nvidia drivers and let windows do an update this normally seems to make vista stable.but to day it never.
i then rebooted into xp and started getting bsod which was NVENETFD.SYS and the other was something about usb.
so ive changed ram from sli enabled to default which still gave me same problems,i then turnt pc off went away for 1 hour came back and now vista seems stable no errors.
any ideas if i have problems with motherboard,ram or graphics card or maybe all.
thanks.

 

[Had3s]

check that you aren't accidently overvolting the ram, and if possible run a memtest to make sure the ram is good.

I never had my evga 680i with ocz 8500 completely stable, and it turned out the board nuked the ram after about a month or so running fine on vista. RMA'd the lot, sold the ram and got corsair (which was also nuked by the evga) and got a striker. another ram rma later and all is well - plus i got a spare 2nd revision EVGA i'd like to use for the missus new PC.

 

[judmann]

thanks for reply
ive ran a memtest in xp for 9hrs and it didnt find any faults.
ive never changed volt settings or any other in the bios only enabled the ram to sli.