> if it goes up to x850

That would be R400 then. Drivers not only for R300 but R400 as well would be nice indeed.

> the fastest possible flashable card would be a
> Sapphire X800 XT Platinum Edition i think :)

I believe an X850 XT Platinum Edition is even faster. Or can't you flash such a PC card with a Mac ROM for X850 XT?