Crossfire with Two Different Sapphire 7950's?

Hey guys,

I currently have a Sapphire Radeon HD 7950 (, and I'm looking to buy another card for a crossfire setup. I found a pretty good deal on a used Sapphire Vapor-X 7950 on eBay; this is the model: Would it be smart to crossfire these two cards? Or will there be some complications?

My current card runs at a constant 925 MHz, and the Vapor-X apparently runs at 850 MHz with a "Boost State" of 950 MHz. Should I overclock my first 7950 to 950 MHz, and somehow get the Vapor-X to run at a constant 950 MHz?

I'm relatively new to this kind of setup, so I'm really just looking for the best options and solutions.

Thanks for the future help!
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    Shouldn't be a problem at all, but I wouldn't recommend the 7950 Vapor-X. Its badly designed on the 7950, even though its one of the best coolers on the 7970. It has no VRM cooling, so you frequently see people getting 105 degrees on the VRM's at STOCK clocks. So no overclocking, and there is a chance of causing permanent damage. I wouldn't recommend getting the Vapor-X
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