boomdead123 :
i was wondering if my fx 6300 4.5ghz will bottleneck a windforce 780
other specs
mother board asrock 970 extreme4
16gb 1333mhz ripjaw ram
i have a 600w power supply
h100i cooling cpu
Depends on the software, however, I would have to say that it will bottleneck it overall. I have an AMD FX-8150 @ 4.5ghz myself and it's bottlenecked as well. I've got an i7-4770k coming in though so I won't have to worry about that. I'd say if you can upgrade your processor, go for an 8350 or higher or an i5-4670k or higher if you don't want any bottlenecks.
Edit #1: Let me clarify that I still think you should get the GPU! Just keep in mind that you'll get more out of it if you also upgrade your processor. You can always sell your old one later to re-coup on the money spent.