No, there is nvidia pixel clock patcher for that, here: http://www.monitortests.com/forum/Thread-NVIDIA-Pixel-Clock-Patcher. Included in that package are several patchers, the one to use has SLI in it's name.
This must be used to unlock pixelclock with SLI, i think it is locked at 400Mhz but CBA to check.
Crossfire users must use two crossfire bridges in addition to normal clock patches, as one bridge wont have enough capacity for high refreshrates or something.
Edited by CptKuolio - 5/1/13 at 2:14am