i got official benchmarks of a single hd 7970 (some cfx as well in the source):
http://www.donanimhaber.com/ekran-karti/haberleri/AMD-Radeon-HD-7970-icin-resmi-test-sonuclari.htm
results:
3dmark 11 (1024 x 768)/ :
entry- 11992e
preformance- 7972p
extreme- 2737X
batman: arkham city (2560 x 1680)
high /w fxaa- 40fps
max /w 16AF, 8AA - 25fps
bf3(1080p, 2560 x1680)
high- 80fps
ULTRA 0msaa- 50fps
skyrim(max @ 2560x1680) - 51fps
there are more but this is jsut a sample. by and large the 7970 appears to preform VERY well at resolutions beyond 1680 x 1200 and absolutely raped the gtx 580 @ an extreme multimonitor resolution of 7600 x 1600. benchies were done in games on an fx-8150 while fluids and multi-monitor were done using a core i7 SB-E 3960X, drivers used were CCC 11.11b, nvidia drivers used were 290.38
watch out for the return of the big red machine:
http://www.youtube.com/watch?v=RH0mdKw4iFM
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