First of all,GTX 460 is a complete overkill for your resolution,cards like HD 5770/GT 450
can handle all games fine on that res.
Anyway,to answer your question,yes the CPU will bottleneck a GTX 460 at this resolution.
The GTX 460 would perform admirably. However as Maziar stated, it's more video card than you can use. The CPU will limit it ultimately, and the low resolution you're at doesn't require nearly as much power as the GTX 460 can provide.