With current firmware/bitstream versions those can do 400/200 MH/s. With the new firmware that's going to be released soon, they will add dynamic overclocking support, so they should end up at the same hashrate (or twice the hashrate for the X6500) that the ztex boards have.
Cheers Seven, that does change the stats a hell of a lot now.... seriously, that gives the x6000 series a bigger wedge to apply...