A few months ago, we assessed the performance of a pair of GeForce 6800 GTs and a pair of GeForce 6800 Ultras running in SLI-mode, and were impressed by the platform's performance. We did have some concerns over driver support and the TCO of the platform, however. NVIDIA's current SLI (Scalable Link Interface) technology requires a specific profile be integrated into the drivers that dictates whether alternate frame rendering (AFR) or split-frame rendering (SFR) can be used for a particular application, and without that profile SLI won't function correctly. And a pair of GeForce 6800-class cards plus an nForce 4 SLI motherboard commands a significant monetary investment, so the technology isn't for everyone.
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Review:
Hothardware