@Corpse
About the CPU, the CPU isn't the most important part in FPS games, it is however more important in RTS games from my expirience.
I'm running an old 775 Q8200 2.33Ghz quad-core, i never overclocked it, and with the cooler i have
I'm well able to do a LOT of overclocking, but i never needed it up till now....
IDK but this old quad is capable of running ANY game available atm without having to overclock it, i don't know about BF3 tough, it says on MAX it requires a Quad-core but some say a quad other say a Good I-5 processor, so idk what processor do you use?
About the power supply, i ussed to have a 8500GT and i upgraded to an 8800GTS(before i got my 250GTS) my power supply at that time was 500Watts.
So i had the problem your asking about, you see at certain points in a game the GPU or just the PC might need a sudden extra power or a spike....and in my case these sudden spikes where above 500Watts, so my computer Reseted without an error report....i payed 79Euros for a new motherboared thinking that was the cause.....
After that i just upgraded to an 800Watt nox modular and if i haden't taken that one i wouldn't be able to upgrade my card....
MT