4870 + 4890 CF with 700W PS

BoBzzz

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Jul 10, 2008
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In a few days I will be getting my hands on a 4890. I currently own a 4870 which will be going to my brother but he wont be around for a few weeks so I was toying with the idea of crossfiring the two for a bit.

Will my current power supply be enough to power them both? (+ an E8500 and 2 hard drives)
PS: http://www.newegg.com/Product/Product.aspx?Item=N82E16817256045

Also will I run into any problems I should know about? From what I understand this should work but the 4890 will underclock itself to 4870 speeds.

Thanks!