Based on testing at NVIDIA’s SLI Validation lab, the following power supply suggestions should be followed.

Check here for a list of NVIDIA Certified SLI Ready Power Supplies.

If the power supply specifies two 12V windings (i.e. 12V1 and 12V2), then these current numbers can be added together to check against the specifications described above.

For systems with the 6800 Ultra or 6800 GT, please make sure the power supply also contains a PCI Express auxiliary power supply connector.

If your power supply does not have a PCI Express auxiliary connector, please contact your graphics board partner for a HDD to PCI Express power adaptor.

Note: NVIDIA SLI power supply recommendations are based on the following test configurations:

High-End NVIDIA SLI Configuration:
Dual GeForce 6800 Ultra Graphics cards
Athlon 64 939-pin CPU or Intel Xeon
Two or more HDD, including RAID 0,1, 0+1 or 5 configurations
Two optical drives
PCI sound card

Mid-Range NVIDIA SLI Configuration:
Dual GeForce 6800 or GeForce 6800 GT Graphics cards
Athlon 64 939-pin CPU
Single HDD
Two optical drives
PCI sound card

Entry-Level NVIDIA SLI configuration:
Dual GeForce 6600 GT Graphics cards
Athlon 64 939-pin CPU
Single HDD
One optical drive