Tom's Hardware's guide has similar results too in thier new Summer Benchmarks. The results indicate that at low resoultions like 1024x768, etc the SLIed cards perform signifcantly slower than single cards, and u can see ATI X800 series cards rule the top there.
Only at higher resolutions of 1600x1200 and high levels of anisotropy and antialiasing, the SLIed cards perform better.
Only at higher resolutions of 1600x1200 and high levels of anisotropy and antialiasing, the SLIed cards perform better.