S3 will be available in later GPU-Z releases it currently does not support it however S3 has contacted w1zzard and they are currently working together to add support for S3 in gpu-z future releases keep tab on the GPU-Z beta threads for more information.
if i were to take a guess id say a couple more weeks ATM not sure if S3 has to send hom a tester card b4 he can figure it out but it would probably speed the process up..however if you can submit a bios dump contact w1zzard and give them to him it may help