This message was posted by Intel Corporation on behalf of
Here are the answers to your questions:
1- That will depend on the total wattage that your server components will use but normally 650 watts is good enough.
2- Get a new one indeed.
3- The power supplies validated for the board from Intel are listed here page#9
4- The validated cards for the board are the following:
NVidia Tesla M2090
NVidia Tesla M2050
NVidia Tesla M2070