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I'm getting a good deal on a 6990, going to sell my 570. Was wondering with my sig rig just replace 570 with 6990 going to work on the 650w?

Thanks so much!
 

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I wouldn't. I had a 820w blow out on me when I switched from cfx 5870s to a single 6990, and that was setting overclocks to stock. I'd get something with a bit more room.

Also, official requirements are a 750w power supply.
 
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