4 Graphics Cards - Ready For SLI And Crossfire
The Skulltrail system is designed for two CPUs on the one hand and up to four graphics cards on the other, allowing multi-card configurations such as Nvidia's SLI or ATI's Crossfire.
Using two powerful graphics cards in the Skulltrail system also means you'll need a power supply with four six-pin auxiliary power cables. Consequently, you'll need six such cables for three cards. Even many of the pricier PSUs found in stores only sport four PCI-Express power cables, forcing you to use two adapter cables with a three-way SLI system.