根據VR-Zone的測試及推論, 7800 GTX SLI的表現主要受制於CPU瓶頸.
至少要把FX-55超到3.2G才能餵飽.
http://www.vr-zone.com/?i=2367&s=1

VR-Zone has posted their GeForce 7800GTX Review for your consumption. The review includes some CPU Scaling tests in 3DMark05 showing that 7800GTX SLI is CPU limited.
Based on the fact that we should see a similar 31% boost in 3DMark05 for 7800GTX SLI, we projected the score should be 13557 and if you look at our scaling tests above, the bottleneck is not solved yet. Based on some calculations, every 200MHz increase in clock speed of the FX-55 will give us a ~550 boost in score. Therefore by running FX-55 at 3.2GHz with a projected score of ~13570, only then the CPU bottleneck issue will be resolved.
http://www.nvnews.net/