Re: Upgrade processor or graphics card?
Your CPU is fine, your actual GPU is still fine, it may be running a lil hot? Try cleaning the vents, also what games is it? If it's your GPU get a GTX 460 1GB Version or a 6870. Your CPU will be the limiting factor most likely then but I highly doubt a Q6660 will bottleneck you, If it does overclock it.
Intel I5 2500K | Gigabyte P67 UD5 |16GB Mushkin Redline @ 2133MHZ|Custom Watercooling | Crucial C300 64GB SSD | GPU currently bidding for |Corsair HX 1000W PSU | Corsair 700D