*www.extreme.outervision.com/index.jsp
if the wattage is low you are not geting full output from graphic card and at times it can be dangerous, you may fry mobo or graphic card
open the case and see what wattage is the smps,
more than wattage amps on 12 v rails is important///for that you need a multimeter any electronic shp can tell you that..
i have 48A on 12 v rails , tagan psu
look for the pwer rewuirements of the graphic card from manufac site,
i really doubt if iball supplies a good company SMPS/PSU
tagan 600 w cost me 6k a month back