I have just been playing against like 6 bots and not online. I installed my 5770 and I'm 100+ all time maxed 1080p except for de_nuke which I drop down to 40. Anyhow, I remember something weird happening, few months ago. I woke to play Gmod, and once loaded up i was getting my usual 150+ fps than all of a sudden dropped to 50-70. Ever since that TF2 and CS:S have lowered FPS. Even with my radeon 5770 installed I go as low as 28 fps in TF2. Even when I change screen resolution the FPS stays the same.