Gigabyte GA-M59SLI-S5 nForce 590 SLI Motherboard Review
 

You might be thinking Gigabyte has devised some kind of 'Tri-mode SLI' feature where three graphics cards can be run in tandem for mind-blisteringly fast gaming results.... well not quite. In reality the two blue PCI Express x16 slots operate to support SLI with a standard SLI bridge card and 32 PCI Express split between the two. The third slot operates at PCI Express x8 speeds, and can currently be used with an additional PCI Express videocard to expand desktop real estate, or very shortly with the anticipated new nVidia physics cards.