Current test samples of Radeon 8500 are using chip with the stepping 'A12'. This stepping has still got several known issues, as already mentioned above. It was neither able to run FSAA, nor video playback or HydraVision. ATi is currently waiting for stepping 'A13', which is supposed the final stepping for the cards that will go on sale in September.
Our card was equipped with Hyundai 3.6 ns DDR-SDRAM, which is required for memory clocks of 275 MHz.
Here is the Powerstrip screen to show the clock settings: