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your 600w psu only has 22a on the 12v rail?!?! get rid of that.

see that's why people are often so confused about psus....

an Antec smaertpower 2 350w has 2 12v rails w/ 10a and 15a
the FSP 450w psu I just got has 2 12v rails w/ 18a on each.

both of those psus are probably more powerful than your 600w... your current psu is definately the problem! it is not near powerful enough for your system.

depending on price range here are the best psu's you can get.
under 100 - sunbeam nuuo 550w
under 200 - seasonic s12-600
over 200 - pc power and cooling 510 express sli (or a better pc power and cooling model)
 

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yeah, your psu is capable of supplying 680w max power... but the problem is that the majority of the power is on the 3.3v and 5v rails...

older computers primarily used the 3.3v and 5v rails and that is why a lot of power supplies still have most of their amps on these rails... the problem is that today's computers draw most of their current from the 12v rails... so the newest psus have more power on the 12v rail(s) and not as much on the other rails as they used to.

for example, my Seasonic S12-600 which is widely held as the best psu for under $200 has rails like this:
3.3v 30a
5v 30a
12v1 18a
12v2 18a

so you see my psu has almost double the amps on the 12rails (mine has 2) and much less power on the 3.3v and 5v rails
 
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