> I see three possibilities:
>
> 1. The GPU is overheating.
>
> 2. There's a bug in the version of the video driver I have installed.
>
> 3. Valve have made an update to TF2 which introduces some kind of 
> rendering bug.

4. Hardware fault on the graphics card (eg bad RAM)

> Apparently the nVidia control panel no longer tells you your GPU 
> temperature; you have to download and install an additional tool. Anyway, 



Try showing the temperature in parallel with running the GPU (eg 3D game in 
a window), IIRC when I did those sorts of tests before, the GPU temperature 
dropped rapidly very quickly (eg 10-15 degrees in just a second after 
exiting a game).

> To me, that sounds rather damned hot. Is it usual for a GPU to get this 
> warm?

Actual chip core temperature of 55 degrees seems fine to me, if it got to 80 
or 90 I would start to get worried.

> At this point, I'm not sure if my GPU is failing, or whether I just need 
> to update my drivers...

One very easy and cheap way to check...

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