I'm shopping for a new Vid card, so I've been heavily comparing cards using THG's "VGA Chart" (http://www23.tomshardware.com/graphics.html). I noticed that most (all?) "SLi" capable cards on the list turn in higher numbers than their non-sli counterparts. Is this because the test results reflect multiple cards running in SLi mode, or are single SLi-capable cards just better?