Windows 7 x64 - device query only sees cards with monitors plugged in

Hi All,
I am running CUDA 3.0 on a early 2008 macpro with windows 7 x64, everything seems to work great, but I just installed a second gtx285 card and when I run devicequery the second card only shows up if I attach a monitor to it. Does anyone know a way around this? I would like to use the cards just for processing.
Thanks,
Craig

try the 256.xx betas–you might have good luck with those…

Thanks for the quick reply. I assume you mean the 257 drivers as I’m on a windows platform. Anyways I tried to install them but it fails saying that it couldn’t find any compatable drivers… but them maybe I need to correct what I said… I am actually using windows server 2008, which supposedly has the same base as windows 7 x64, so the drivers should work… right?
Thanks,
Craig