Hello, i have questions about 5970 cards.
Is it possible to use 3 cards (6 gpu) under windows? Dummy plugs are mandatories ??
How can i undervolt these cards to run 3 cards on 1000w psu.
Thanx in advance

I don't see a problem with it software wise, but u'll most likely need stronger PSU or add 2nd PSU to the system. Does your PSU have enough PCIe 6+2 cables?
Dummy plugs aren't required anymore (as of Catalyst 12.8 if I recall correctly)
Use MSI Afterburner to control voltage etc.