What's Causing These Graphics Corruption / Glitches?

[Synomenon]

Just put together a new system:

Asus P8Z77-I Deluxe/WD
i7-3770T
16GB DDR3-1866 Corsair Dominator Platinum
EVGA 04G-P4-2673-KR
SilverStone ST65F-G 650W PSU

Dell U2713H (2560x1440)
Dell U2410 (1920x1200)
Dell U2211H (1920x1080)

I'm experiencing frequent / constant graphics corruption / glitches and momentary blackouts in Windows 8 Pro. x64 (full, clean install). It started the moment Windows 8 booted and the initial setup began. I've tried disconnecting all monitors except the U2713H since that's my main monitor and these issues still continue.

I had Windows 7 Ultimate x64 installed yesterday and I did not have this problem. I've run Memtest86+ for 48 hours as well as HCI Memtest (also for 48 hours) and no memory errors detected. I've also run Prime95 blend test for 24 hours straight without any problems.

I've uploaded a video of what's happening here:
https://www.dropbox.com/s/kzg3iui6sn8c69c/Graphical Glitches.MOV


Anyone have any idea what's going on?

 

[Synomenon]

Figured it out. The U2713H's DisplayPorts were set to DisplayPort 1.2 instead of 1.1 in its menu. Changing it back to 1.1 fixed the issue.

Surprised to see this happen though. Didn't happen with a Radeon 7970 that I had.