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Quoted from insanity

Im using Windows Vista 64-Bit though, so i doubt windows 7 is the problem.

7 and Vista are just as bad as each other.

yesterday I said fuck it and installed Vista 32-bit again (bullshit OS) now however my fps is at 120 all the time with chris high fps config.

It’s a shitty solution but It’ll have to do for now

i had a very similar problem a while back, and mine was due to overheating like some of the previous posts suggest.

i had no idea why it randomly started – it was all working flawlessly then suddenly i started getting the mental fps drops, and like i said, once i realised it was overtheating (and yeah strangely only on tf2, not apparent when playing other higher spec games?!) and got a new fan it was competely fixed.

should at least look into that possibility mate