htc fan :
I thought it's better to go with 80 + gold psu and could you explain why a G1 isn't good? is it because it's outdated or something?
Gold is just an efficiency rating, it does not mean the unit is quality. In particular, the 750 NEX G does not do very well with voltage stability. It does have 100% Japanese capacitors which is a good thing, but the voltage stability is not good. It's average, to say the least. The 650 NEX G is much worse.