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BareFeats runs GPU tests for FCPX 10.1 and Motion 5.1
https://www.barefeats.com/tube02.html
Notice that toward the end of the article he says:
Out of curiosity, we ran the tests with dual Radeon HD 5770s and got render times only slightly slower than dual 7970s. The 5770s require only one power feed each so we used the two factory standard PCIe power feeds. A pair of them is definitely faster rendering in FCPX 10.1 than any single AMD GPU including the Radeon HD 7970.