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In regards to all the posters mentioning other 1950pro models, I was trying to keep the additional money out of pocket to a minimum. It sounds like it needs more power than my PSU has.
How about the 7900gs? I recall reading that it overclocks well, putting it to about 1950pro levels?
The 1950PRO uses 65 Watts of power, or about 5.4 Amps from the 12 Volt Rails. You could probably run it on a 350W PSU with 20A on the 12V rails. Of course it depends on your other system components too.