Well, more is generally better, but I'd look at the card you intend to buy before you decide on upgrading your power supply.
Take this with a grain of salt -- after all, I bought a passive-cooled card specifically because I didn't want to worry about power issues -- but I'm running just fine on a 400w supply right now.
Check out this link: http://www.antec.outervision.com/PSUEngine
It allows you to specify everything you have and will give you an estimate of the minimum wattage you need. My system chimes in at 271w, for example -- 331 if I throw in the recommended capacitor aging factor.
--sofaspud
--"Listening to your kid is the audio equivalent of a Salvador Dali painting, Spud." --OpMegs
Take this with a grain of salt -- after all, I bought a passive-cooled card specifically because I didn't want to worry about power issues -- but I'm running just fine on a 400w supply right now.
Check out this link: http://www.antec.outervision.com/PSUEngine
It allows you to specify everything you have and will give you an estimate of the minimum wattage you need. My system chimes in at 271w, for example -- 331 if I throw in the recommended capacitor aging factor.
--sofaspud
--"Listening to your kid is the audio equivalent of a Salvador Dali painting, Spud." --OpMegs