Thought I'd give this a bash, as I've not played it since upgrading my gfx card from an, XFX 512MB 9800GT....to a, Gainward 1280MB 570GTX.
I encountered an issue, however. Thankfully, not caused by the gfx card.
On a, Deck map fly-by, my framerates would drop from 120 to 15, whenever passing over the slime pools.
Full screen res of 1280:1024; all settings enabled or set to the highest, except vsync, and decal options.
Turns out that the Gamestracker client, I recently installed, was the cause of the sharp drops.
By closing it down, my drops around the said areas of Deck, fall to about 70fps.
Other than that, all seems good !! Might join a multiplayer game later on today...