Nvidia’s Response to Early DIY Quad-SLI

Nvidia notes in the reviewer’s guide that “Quad-SLI is designed for extreme HD gaming at 2560×1600 with very high levels of anti-aliasing and filtering (i.e. 8X SLI-AA and 16X-AF). At resolutions lower than 1920×1200 and with low filtering settings, CPU-bound behavior is more prominent, and Quad-SLI may perform a bit slower than standard SLI due to additional driver overhead managing four GPUs.”

If you are thinking of splurging on Quad-SLI, you will probably want to wait unless you plan on running 2560*1600 with high AA and AF. The main issue is the latencies at lower resolutions cause games at 1600*1200 and lower to actually run slower on Quad-SLI.