Halo

Halo is very shader dependent and the 6800GT-SLI and the 3D1 simply tear it up here. We're seeing about a 67% jump over the single 6800GT. The CPU does play a role here in limiting performance so we are not seeing the 90%+ like in 3DMark05 but it is still impressive nonetheless.

UT2k4

Our UT2k4 demo is also fairly heavily CPU bound with the current high end cards. We once again see the overhead that is involved with the SLI setup as the single 6800GT is a tad faster on several occasions. Framerates on the 6800GT-SLI setup stay excellent up to the 1280x1024 8xS / 16x AF setting before it plummets, likely due to memory constraints. We see this problem with the 3D1 as each GPU only has access to 128MB of memory and it takes a sharp nosedive at 1280 with 4xAA/8xAF like other 128MB cards.

* Note that the custom setting is not a direct comparison between the NVIDIA and ATI card as the antialiasing setting is different - 8xS mode on the NVIDIA and 6xAA mode on the ATI.