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I am thinking of buying a used PowerColor Myst (Tahiti LE) and overclocking it to roughly 1200 Mhz.

However, my PSU is only rated at 550 Watts. Is that going to be too much to ask of my PSU. Link to my PSU's specs: http://www.coolermaster-usa.com/product.php?product_id=2726

Thanks for any help! thumb.gif