Matching power supply with new video card...

add up your watts

you should use 600-700 psu with 42-50 amps - my son is running a x1950 pro with 560j @4.1ghz and its crashes alot of psu's under 35 amps - we test parts in his system

read those links on how to size it

silverstone strider 600 is $110 at east luna i think its more at newegg?

600W for a 1950 pro? that's more than a 8800GTX requires!