Will I need a larger power supply?

[xenon5]

My current setup is 2x 5770s overlocked and 1xAMD Sempron 130, and I have a 530W 80+ certified PSU.  I have space for 1 more GPU on my motherboard.  When buying my components I followed a guide that suggested using the 530W PSU for 3 5770s, but I was thinking of getting a 5830 or 5850 instead for the 3rd GPU.  How much more power, if any, would I need if I chose one of these cards instead of another 5770?

[Kermee]

My current setup is 2x 5770s overlocked and 1xAMD Sempron 130, and I have a 530W 80+ certified PSU.  I have space for 1 more GPU on my motherboard.  When buying my components I followed a guide that suggested using the 530W PSU for 3 5770s, but I was thinking of getting a 5830 or 5850 instead for the 3rd GPU.  How much more power, if any, would I need if I chose one of these cards instead of another 5770?

Do you have a Kill-A-Watt available to see how much headroom you have?

I'd highly suggest a 5850 over a 5830 since the TDP difference between a 5770 and 5850 is 50W.  Though you might be fine with a 5830 still...  Hard to say.

Cheers,
Kermee

[PiGames]

https://en.bitcoin.it/wiki/Mining_hardware_comparison
Has the wattage for some of the more popular overclocked cards.
Might help if you haven't seen it before.

[pekv2]

Maybe a 750w - 800w to be on the safe side?

[deslok]

The max board power of a 5770 is 108w. Check how the 530w is separated per voltage on the psu to make sure you have enough left on your 12v rails.