The best replacement for 7950 crossfire is 290x.

The best alternatives to 7950 crossfire are rated as following:
★★★★★  290x
★★★★  760 sli
★★★  7990
★★★  670 sli
★★  gtx 670 sli
★  660 ti sli
★  680 sli

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Speaking about 7950 crossfire, one probably shouldn't forget about 7970.

Other search terms related to 7950 crossfire and their ratings are:
★★★★★ 7970
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7950 crossfire
290x
760 sli