NVIDIA announced and hyped it's Quad SLI technology a couple of months ago but they are still not available.
At press time in mid-April the world’s leading maker of high-performance systems – Alienware, a part of Dell Inc. – could supply quad SLI systems no earlier than on May 18, 2006. Dell Inc. itself did not take pre-orders on its famous Dell XPS 600 Renegade system. Velocity Micro, a launch partner of Intel Corp.’s dual-core Pentium D processor, also could supply quad SLI systems no earlier than on the 9th of May. Bolton, England-based Scan Computer said it could ship quad SLI computer “in 10 to 14 days” after online order when phoned during the week.