My friend and I just built his newly bought gaming machine and the first thing that happened was that we ran into a really annoying problem. With random interval the coputer freezes and won't start again before we reboot it. We can't see any links between the freezes except that we usually get another freeze while rebooting after the first one. Another common denominator is that it's almost always in games that the freezes occur. We aren't seeing any other problems then this one and we have tried to update all the drivers (catalyst, intel chipset e.t.c) we have even flashed the BIOS to see if that was the problem. The only thing we noticed was that the problem seemed to occur more after some of the updates, but it's hard to tell when the freezes can occur hours apart sometimes.
Motherboard - MSI P45 Platinum
Processor - Intel Core 2 Duo E8400
Memory - Corsair XMS2 Xtreme TwinX PC6400 2x2 GB
HDD - Samsung SpinPoint F1 750GB SATA2 32MB 7200RPM
Power Supply - Corsair Powersupply 750W Black
Graphic Card - 2x Sapphire Radeon HD 4850 "TOXIC Edition"
OS - Windows Vista Home Premium 64-bit
As you see we are running a crossfire system, not that this should be a problem with these cards.