Is there much between the Radeon 7950 vs R9 280X?





 
Except the 7950 is no longer in production and you can only get second hand cards for exorbitant prices. So you might end up with a dead/faulty product with no warranty.

Most high end games support Crossfire but even then it has issues yet to be fixed by AMD. In casual/indie games a single 7950 is already overkill.
 


You are right. It isnt worth getting a 7950. But I dont think its worth upgrading to a 280x either.

 
If you really want an upgrade why not get one of the new R9's and crossfire it with your 7950. The 280x is equivalent to a 7970 ghz edition and compatible to crossfire with 7 series cards. While your 7950 is slightly slower, even with the R9 dropping down to the speed of your 7950 you'll still get a nice performance boost in games that support crossfire, and can run the R9 alone for games that dont.