I put together this chart comparing the GTX 460 to the GTX 560Ti 448 core and the GTX 670 using the following benchmark sites:
»
www.videocardbenchmark.n ··· pus.html»
www.hwcompare.com/I didn't include the GTX 660 because, while it is faster in some cases, it's actually slower than the 560 Ti 448 core when it comes to pixel rate. I consider the GTX 670 to be the next "true step up" to the 56Ti 448core, so I included that for reference.