Not enough power for an OC?

[vivi2000]

I am trying to OC my gpu, a 6950 1gb
http://www.newegg.com/Product/Produc...-921-_-Product
I have this PSU currently
http://www.newegg.com/Product/Produc...82E16817371010
I also have an i5 2500k @ 4.8ghz and 1.38v. I was running GPU-Z during some gaming today at stock speeds and noticed the VDDC current was around 60A +/- 3A.
The combined 12v rail on my psu is just under 60A, when i try to overclock past the limit set by CCC using sapphire trixx my system locks up and i get multi colored lines covering my screen.
I am going to be replacing the psu soon, because i have the intention to crossfire, but i wanted to get an opinion on if my current psu is limiting my gpu's oc ability.

 

[dma0991]

A 650W PSU shouldn't be having that much of a problem handling an overclocked CPU and GPU. Maybe it could be cause by your PSU that has more than one 12V rail instead of having a single strong 12V rail.

 

[BTRY B 529th FA BN]

A good place to ask this question about the split rails is Jonnyguru.. check out their forums and web-page..