upgrade itch

[pc_monkey]

HI guys, I am suffering from upgrade-itis, and I'm really tempted to get a GTX670.

I have a 2500k overclocked to 4.6ghz, an Asus P8Z68-V mobo which is not PCI 3.0 ready, and GTX460 1gb SLI.

Question is will I see a significant performance gain playing BF3 if I upgrade to a 670, or do I need to upgrade the mobo as well ?

 

[pc_monkey]

thanks rusty0611, now the hunt for the best overclocking 670.. time to post another question.