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S.T.A.L.K.E.R: Clear Sky: S.T.A.L.K.E.R: Clear Sky is another game that takes advantage of the capabilities of DirectX 10.1, and it also happens to have a free downloadable benchmark. Set in the time period before Shadows of Chernobyl, the player assumes the role of a mercenary in a radioactive wasteland. Based on the X-Ray 1.5 engine, Clear Sky makes for a popular benchmark. For the single GPU cards, testing was done at 2560x1600, with all other settings maxed out, including DX10.1 rendering and 4xMSAA. HD4890 2GB:
The first run was done with the HD4890 2GB, and we have average framerates of 12.9, 11.4, 12.1, and 8.7. HD5770 1GB:
The HD5770 was run next, with average framerates of 10.7, 9.8, 10.5, and 7.4 frames per second. HD4870X2 2GB:
On the 4870X2, the benchmark ran at 19.3, 17.1, 18.0, 13.2 frames per second, roughly doubling the HD5770. HD5870 1GB:
The HD5870 ran at 18.6, 17.5, 19.3, and 13.2 frames per second. The 5870 lost by 3.8% in the first test, won by 2.3% in the second test, won by 7.2% in the third test, and won by 0.8% in the last test. The HD5870 wins here, but only by a nose.
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