I have purchased a used PC recently & want to verify whether my SMPS is ready to handle this for a long run.
SMPS : Cooler Master Silent Pro 600w.
Main GPU : Geforce GTX 570
Phyx GPU : Geforce 9800GT
Moderate level of overclocking i have already did with Proccy.
It will handle easily. Let see other's view on this.
i wouldnt consider CM silent pro 600w better than Corsair VX550.
Corsair vx550 can handle a single GTX 570, but not another card along. and u overclock too.
it would be better going for a 750-850w power supply from corsair or seasonic.
Corsair tx750 @ 7200 and Seasonic s12d 850 silver @ 7200.
i will recommend the second one.
^^ Dont ever underpower any PSU's. But although considering that OP had done OCing and going to use 570+9800GT, Seasoni 850W seems to be good option
IMO he is already having it & btw it running, he is just clarifying whether it can survive for in future or not.
Next CM Silent Pro is a good series of SMPS, it not like i'm saying Corsair or Seasonic is bad PSU's.
@OP : This PSU can handle it, but later onwards, if your are planning to SLI or upgrade another card, then it might create a trouble.
600W will handle both. 850W will be an overkill. also if the 9800GT causes any stability isue, simply unplug it.