Just bought two used gtx 580s on ebay, Need a cheap 80+ power supply
A PSU is not something you go cheap on. Most likely your budget will have to exceed $120. You'll probably need a 750 to 850 watt power supply.
http://www.extreme.outervision.com/psucalculatorlite.jsp will help you calculate peak power draw.
See the PSU recommendations list http://whirlpool.net.au/wiki/PSU_Recommendations
I recommend a Silverstone ST75F P
A PSU is not something you go cheap on. Most likely your budget will have to exceed $120.
You'll probably need a 750 to 850 watt power supply.
http://www.extreme.outervision.com/psucalculatorlite.jsp will help you calculate peak power draw.
See the PSU recommendations list
http://whirlpool.net.au/wiki/PSU_Recommendations
I recommend a Silverstone ST75F P