I have got a Cooler Master Xtreme Power Plus 460 watts
So now I am planning to replace my hd4670 with a gtx560ti(384 cores) or a hd6950 2gb.
According to wattage both cards should just barely run on my psu,but I cant understand
the deal with the 12V rail thing
its says 12V1 and 12V2 both have 18A so thats 12x18=216w on each rail right? :S
A review of your PSU from a reputable site: http://www.hardwaresecrets.com/art [...] iew/550/10
Even though you have (2) 12V rails with 18A on each rail, the max wattage for the both 12V rails is 312W...26A. The GTX 560ti requires a 500W PSU with a minimum of 31A on the 12V rails and the HD6950 requires a 500W PSU with a minimum 30A on the 12V rails. The Coolermaster Extreme Power Plus 460W is not sufficient to power your planned upgrade.