I picked up a used m2090 and have tried adding it into a Windows XP 64bit PC (foxconn destroyer mobo) and a Dell precision 3500 running Windows 7 64 bit without much luck at all. No matter what drivers I try, it always comes back as a coded device failure. I have both of these machines working fine with nvidia 8800-series, and 750 Ti series GPUs, respectively, just fine. I suspect there is combination driver problems trying to get the m2090 to work at the same time as the 8800s or 750s. Anyone have tips or tricks? THANKS IN ADVANCE!

Is this what you try:
TESLA DRIVER 341.44
http://www.nvidia.com/download/driverResults.aspx/82964/en-us

I don't know if this driver can co-exist with the
GEFORCE 341.44 DRIVER
http://www.nvidia.com/download/driverResults.aspx/82467/en-us

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- ALF - "Find out what you don't do well ..... then don't do it!" :)
 

I resolved the issue, had to do with power connections. I now have my m2090 humming along nicely with my 2x 750 TIs, and a GT 8800 in a Phenom II x4 940 Foxconn Destroyer rig...