Hello everyone. I just bought an XFX 9800GT & to my dismay, it didn't run smoothly as i thought it would be. Games, websites ctd. All because of my low wattage psu. It didn't occur to me to change the psu when using the latest gfx cards because it came with a 6 pin to dual molex connector, so i thought it would be okay. I've done some research on looking for psu's & found to look for the amps as well. Now i don't know just how much i amps i need. I've selected 3 options from my local store, a Coolermaster Real Power Pro 550w with 25amps & two unknown brands which i`ve never heard before both at 500w with one at 27amps & the other at 30amps. All which fits under my budget of 100 bucks. Please advise. Thanks.