Try the 6.3 drivers. I have a little more faith in them than 6.6. Make sure you properly remove the old drivers before installing new ones. Just curious, what are the rest of your specs?
My last three cards have been sequential generations; however, this is not really planned. I have a card, it was high-end when I got it and I'm still happy with it, but then I catch a newer gen. card for cheap, and I buy it. Perfect example is my most recent video card upgrade, replaced my...
I still have my X850XT PE. Still a great performer (I put it in my SFF PC). It still has some lasting power, it will be fine 'till the end of the year and a little further. just don't expect to run all of the latest games maxed.
Believe it or not, someone on another forum had a similar problem with low performance with his X1900XTX. IDK if it's drivers or what, because he got low frames in CS:S playing 10x7 with everything else cranked. I play 16x10 with everything cranked on my card and never drop into the 40's. Try a...