a power supply has 3 different "rails", +12, +5 and +3, so yes it is possible. the slot itself won't suffice in giving the video card power, the 260 will have a 4pin molex connector to give itself power directly from the powersupply. you should check if your current power supply has enough wattage to feed it as it will be significantly more than your previous 8600.
Before I forget I think the voltage diff is when they changed from
0 to 2.0 pci-e. It is backwards compatible but if anything your cpu will be the bottleneck
FYI :
8600GTS min 350w
GTX260 min 500w
Before I forget I think the voltage diff is when they changed from
0 to 2.0 pci-e. It is backwards compatible but if anything your cpu will be the bottleneck
FYI :
8600GTS min 350w
GTX260 min 500w
Little bit of show, little bit of go.