Oct 102012
 

Straight from the README for the latest NVIDIA drivers. Going to give this a try next week when I have more personal time.

Increasing 4-way SLI/Multi-GPU Performance

Issue

With some games and applications, you may experience little to no performance gain or
even a performance drop with 4-way SLI or multi-GPU configurations.

Resolution

  1. Open the NVIDIA Control Panel, then click Manage 3D Settings from the navigation
    pane.
  2. Click the Global Settings tab, then scroll to the Power management mode feature, click the corresponding list arrow and select Prefer maximum performance, then aclick Apply.