cant you jsut SLI them and have the display port one as the master card? Sure your case may feel like having a hair dryer at your feet but think of the FPS!
(dont know anything about SLI, using crossfire myself)
Live! Kashak PSN Kash_Surgeon
Steam Surg3on / Kashak
Old stuff: CoH - Professor Magma, WoW - Kashak, Kashuk, WAR - Kashak (Magus), Rift - Kashtekur
Bishop AKA Jackdin AKA Autekur 1979-2011. Miss you.