Depends on what version of 11 you're benching.
1.0.1 gives higher Physics but lower overall
1.0.3 is absolutely different. It gives you lower Physics BUT higher overall.
7970 Lightning and DCII haven't convinced me yet!
I mean that I haven't noticed anyone with huge clocks (elmor doesn't count once he is working for MSI).
On the other side many ref. cards have scaled at 1600+ core.