Hi there my 8600gt died and am thinking of getting either a GTS 250 or 9800gt as replacement, cant afford any better. My PSU is a thermaltake PurePower 500W with 14 and 15 and on the 12v1 and 12v2 rails respectively. The GTS supposedly needs combined 30 amps on the 12v but im not exactly sure what that means, because it will only be using one connector. Any help will be appreciated!