Best card until bottleneck by X3 710?

[lamp23]

I have a phenom II x3 710 (stock @ 2.6). Is there a card out there that would be bottlenecked by this cpu?

Also, I was looking into the gtx 460. I currently have a gts 250 and noticed that there wasn't a big difference in the core clock speed. I haven't researched cards since the gts 250 came out. What is the main hardware feature that makes the gtx 460 get double the frames in benches?

 

[nforce4max]

The GTX 460 there isn't much more that is going to improve things unless you expect to get some high overclocks on your cpu. Even a quad these days are starting to fall short in some tasks and a 6 core isn't much better.