oclhashcat+ gives error of wrong device

hi everyone
i have asus laptop with ati graphics card radeon 5870. it seems to accept the driver and work on graphics with no problems, yet when using oclhashcat+ it gives error:
i have ssearch the error and found that it means that drivers do not support the card, yet at the same time the amd web site fowards me to catalyst 13.8 beta driver for this hardware.
anyone has any suggestion ?
thanks in advance
tux