rob.
it sure did. i took it down to 550 and 330 (original, 500mhz and 300mhz) and might do some more experimenting when i buy a new psu and fan for the card.
I did get some direct3d errors though, and the screen filled with artefacts and shortly after went black.
But what really scared me was i left it to oc (ati tool) and i didnt know how long it was at 800 and 500, because i returned (from training which went for an hour) and the screen was black, so i had no idea how long it was liek that for.

i am very suprised i didnt cook it.