Thanks for your reply Dark Mantis.
Annoyingly for some reason on Christmas Eve whilst working, my computer was invaded by gremlins (possibly the Grinch) and decided to BSOD on me. After rebooting back to Windows it was fine for another two hours or so and it did it again. However after the second reboot, the computer would not stay in Windows for even a minute before it would BSOD. This would occur in safe mode too.
Even after going into the BIOS and lowering the RAM timings to 1333MHz and playing with the voltages, I still continue to have the problem. If it does not BSOD, Windows will say that only a certain amount of RAM (10 or 8 ) of the 12GB is available. My Crossfire setup also started for no reason to play up (my 5970 was going over 30 degrees hotter than before) so I've now gone back to 6GB of RAM and taken out my other card.
Does anyone know what settings (voltages) I should set in the BIOS in order to get all 12GB RAM to work? As for the short time my system was accepting it, I found that the software I use for work was running a lot faster; saving me valuable time.
I'm using the EX58-UD5 board with two lots of Corsair's XMS3 (CMX6GX3M3A1600C9) 3X2GB 1600MHz RAM. I am aware that the board does not support 1600MHz, so I have it set for 1333MHz with the timings 8-8-8-20 2.
Any suggestions would be most helpful.
Gigabyte EX58-UD5
i7 920 Do Stepping @ 2.67MHz
12GB Corsair XMS3 1600MHz RAM - Currently 6GB @ 1333MHz
ATI 5970 2GB + 5870 1GB in Crossfire - Currently 5870 removed
Corsair AX 1200w
Antec 1200 case