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Currently i have GTX 260 1.8g as my main video card, i am thinking to purchase a GTX 470 as an additional. My current power supply is AlienwareTM 525 Watt Multi-GPU Approved Power Supply. Is that enough?

matherick wrote:Currently i have GTX 260 1.8g as my main video card, i am thinking to purchase a GTX 470 as an additional. My current power supply is AlienwareTM 525 Watt Multi-GPU Approved Power Supply. Is that enough?

that's just on the edge.
i'd try it. if it does'nt work, upgrade the PSU.

Radiance

I am using an Antec 550 Basiq Plus PSU and it works fine. I am not sure if it would work for multiple GPU's but it has enough amps that it "should". Like Radiance said, try the one you have and if it doesn't work then start looking for another one.

At full load/max draw, the 260 + 470 should pull almost 400W (180W+215W). That leaves 125W for your CPU, motherboard, hard drive(s), optical drive, and case fans, which is definitely pushing the limits of your PSU... assuming it even has enough on the 12V rail to power both cards. You will probably have to decide if the cost of a new PSU outweighs what it would cost to replace the rest of your system if the Alienware PSU fries everything.

There are also secondary PSU's really designed just for powering video cards. I can't seem to remember any of them at the moment though.