Unless you're playing an RTS, you should be fine with that processor. It isn't going to "severely" hold back your card like some people try to make it out like it will. It's not like pairing a 64 X2 with a high-end card is going to suddenly halve the graphical power of the card. You'll just be framerate capped by your CPU instead of your GPU at lower resolutions, but that's common even with incredibly fast CPUs.
All this means is that you might have a maximum FPS of 90 in a game, whereas a QX9770 might have a max FPS of 130. The only time you might notice your CPU actually limiting noticeable performance in a game is when you play RTS like SupCom with 2958239572385 units or do something very physics extensive, ie. driving into a house in Crysis and destroying it. You might see slight framerate drops, but that's mostly with single-core CPUs. My 6000+ does just fine.