No I haven't run a good benchmark on my card (had a lot of issues choosing cards and kept on switching lol). I can run a 3Dmark and see what I get when I get home if you're curious. I'm running my 7950 at 950mhz core and 1350mhz for memory with load temps around 60-65C and idle temp around 40C in a nzxt phantom case with 6 fans total. I'm running an intel i5 2500k cpu at 4.6ghz.
as far as gaming goes I haven't had any issues with my setup and is able to run everything on max settings with the exception of a few directx9 games giving me driver related issues (which I assume will be resolved eventually)
Also, I'm glad to see that you're running a 750w gold psu, I was running mine 7950 card on a 850w bronze psu before and was getting occasional weird crashs and boot-up issues, switched to an 80+ gold psu and all my problems went away
lastly, there's an interesting 7950 overclocking guide on guru:
http://www.guru3d.com/article/radeon-hd-7950-overclock-guide/
it seems pretty good. again, be mindful of how much heat your gpu fan and case can handle and happy gaming!