You can easily get over 10 fps in large battles without expensive high-end components. Those are not expensive because they are so much better, they are because they're new and find enough buyers who want to increase their e-peen
Reducing some options can help a lot before upgrading. The last patch introduced two new culling settings which should be the first to look at if someone wants to improve his WvW performance.
I'm confused - are you implying that the GTX 650 is a high-end card that can handle WvW without any problems?
It is actually in the same lower-mid tier as the GTX 550 Ti and therefore expected to have problems with many players & effects at higher settings.
The GTX 570 of the OP, on the other hand, is in the higher-mid tier (+ overpriced ^^) and should offer enough performance for high-max settings at 1920x1080,
if driver problems are not an issue. The Phenom is clearly the bottlebeck at CPU-heavy games like GW2, then.
Yep... you should definitely be aware of those fanboys