Is it better to have a 750 wat modulair powersuply (no 80% efficency) or a 450 watts 80 plus bronze?

Btw: it wil be build with a AMD A6-3670k in dual graphics with the Sapphire Radeon hd 6670 (ggdr5)



interesting... 450 is best for now but go with 750 if u want future upgradeability