for my case naa koy mga unit nga dual core for pisonet more or less than 100 W ra ang total sys consumption.then kng mupalit ko ug true rated branded na 500W PSU then murag imbalanced ra kaayo ug medyo pricey pud "nevermind the quality".ug usa pud murag nihit na pud karon mangita karon ug branded na 300W PSU.so most of the people who have less <100Watts PCs will fall to buy a generic 500W PSU than a costly branded one.