I built this machine to 5-box World of Warcraft.
The motherboard requires 8 slots in the case to do triple SLI. :-( So I have one card sitting out for the moment until I decide to either replace the motherboard or the case.
Less than two months in with less than 100 hours on the machine, it blue screened with a video_tdr_failure error code. Then randomly rebooted twice in less than two hours afterwards, and then completely froze with no reboot in less than 5 minutes after the last random reboot.
UPDATE: I'm leaving this build here for historical purposes. I've upgraded this machine with a bigger case in order to install the third video card. See https://pcpartpicker.com/b/JHTH99 instead.