
If you look in the bottom right, you can see that the current memory clock is 594mhz and not 900mhz. I checked that the window was updated by alt-tabbing between them. This explains the problems I have been continuously experiencing with the card. I believe it has something to do with the ATI Hotkey Poller, which manages the clock speed changes from 2d to 3d and vice versa. It is running, and so is ATi Smart, according to MSconfig.
How do I get the Hotkey Poller options back up again, or even better, get the clock speeds right once more?