About a month ago, a friend of mine gave me a new graphics card as a gift. It was working well. Temperatures were under control, and I could run Team Fortress 2 at near max graphics settings and native resolution and manage 60 or more frames per second. However, as of late, that's all gone down the toilet. The quality has gone down to the point that I have to run TF2 at 1600x900 resolution and medium graphics just to get a decent framerate (30 to 60 frames). It might be the graphics card, and it might be the Tough Break update that recently came out for Team Fortress 2. I want to know if there's any way to be sure, and if I can fix this problem in any way.
My processor is an AMD FX-6300 Six-Core Processor 3.52GHz.
I have 8 GB of RAM.