Will this work?

Good Ole Spens

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I'm kind of new to crossfire,and I know the basics, but I have just a quick question: I currently have an HIS ATI Radeon 1GB HD 5770, and I've found a good deal for this on eBay, but I'm just a bit scared that it may not work, even though it's the same family and all, what do you guys think?

Here's my specs, just in case
 

Good Ole Spens

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I have an XFX 650w PSU, and it says on my mobo's page on Newegg that a 600w psu is recommended for Crossfire.
 

Good Ole Spens

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My psu performs exceptionally well for it's price, and I would definitely bump up to 750 if it was in the budget, but sadly it's not, so I'm not too worried about the psu.

 

Good Ole Spens

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Well, hopefully, I'll have just enough leg-room to stabilize the voltages for both cards, now I'm scared lol.