Windows 7 HP (64bit)
Intel Core i7-2600 Quad Core 3.4Ghz
8GB DDR3 1333Mhz RAM (2 DIMMs)
NVidia 1GB 192Bit GTX 550 TI (About to Install an MSI GTX 660)
2TB 7200RPM HDD
600W HP PSU
The HP rep and other people have said that replacing the 550ti with the 660 shouldnt over power my system based on my PSU. I, like any other person, dont really trust The big Manufacturers. My question is do you think that this would over power my system? Ive done research myself, but some PSUs have 1 12V+ Rails. some 2 and some 4 so Im a bit confused......