Yes, If you can, I think you should.  I think you will notice a difference.  But make sure your motherboard can support a newer fx cpu.  You will probably need to update your bios. If you do decide to upgrade, get the fx 8320 instead of the 8350 and over clock it.  It will save you a few bucks.  Also be sure to get a good after market CPU cooler if you don't have one.