Okantah,
sorry for the late response... I use STS a lot with my Asus, and it works fine, even at low latencies. But I must insist that the PCI-E bus is a true performance killer (MV test), and that the Intel D930 really heats up a lot. Just yesterday, when doing some 12-track mixing on sfp, it was running at 82º C, meaning I have to open up the case to let some fresh air in (and some noise out). I believe that the latest dual-core processors run a lot cooler, and maybe the AGP graphics bus is a better option for scope...
Cheers and good luck,
T