I woked it out.
Got my XFX6600GT 256MB AGP to core/ram@548Mhz/1.03Ghz Max core Temp@68˚C
Did not want to push the ram, have not fited all the heatsinks that came with the Zalman VF-700cu. It's a tite fitt for the ramsinks on the core side of the board. I'l have to modify them becauce of the small clearing under the FV-700cu and the board.Half of 2 ramchips are very close to the GPU. I's a pain installing two of them, but woth it for that little extra power