Mr DPD will be bringing one of these today, can't wait, should have only really cost me £50 out of my pocket once I sell a couple of things and it's giving me hopefully about a 20+ FPS increase.
They certianly are cracking cards mate, sure you'll be delighted with your purchase.
Dial down on the AA settings and you'll see even better frame rates naturally.
My benchies were all pushed at max settings at 1080p based on a couple of review benchmarks so you will certainly see the performance you're looking for!

What are you upgrading from?