Absolutely, but remember a hd7790 is 150 or so a hd7950 is 300 and a hd 7970 is 400.
So there is a lot to weigh if you want mining only vs some gaming. If you have a 2 card mobo. vs a 3 or 4 card mobo.
So picking what you want can be tricky.
I have some 1 card setups mitx with 7970's that can game or mine. I used coolermaster elite 120 case's.
I have open board miner only setups.
A lot depends on miner only vs gamer/miner.
Also a lot depends on your access to a good cheap mobo.
Here is a great mobo to mine or game but it costs. 260
http://www.newegg.com/Product/Produc...82E16813128552
this can run 3x hd7970's hash at 1500- 1600 underclock 500-550 watts
or 4x hd 7790's hash at 1200 locked volts watts 380
so if you get a i5 3770k this mobo and 1 hd7970. like I did in nov then add a second and then a third 7970. you can have a great miner /gamer.