Visually, the card looks exactly like the regular GTX 1080 Gaming X. A metal backplate is available too. Dimensions of the card are 28.0 cm x 14.5 cm.
Installation requires two slots in your system.
Display connectivity options include a DVI port, an HDMI port, and three DisplayPorts. Unlike previous NVIDIA cards, the DVI port no longer includes the analog signal, so you'll have to use an active adapter. NVIDIA also updated DisplayPort to be 1.2 certified and 1.3/1.4 ready, which enables support for 4K at 120 Hz and 5K @ 60 Hz, or 8K @ 60 Hz with two cables.
The GPU also comes with an HDMI sound device. It is HDMI 2.0b compatible, which supports HD audio and Blu-ray 3D movies. The GPU video encoding unit has been updated to support HEVC at 10 and 12 bit.
With Pascal, NVIDIA made some changes to how SLI works. In a nutshell, for 4K at 60 Hz and above, NVIDIA recommends new high-bandwidth SLI bridges it dubbed "SLI HB." These bridges occupy both SLI fingers. Traditional triple- and quad-SLI setups are gone as well. Only certain benchmarks can run more than the dual-SLI setup to which all games are limited.
We shine the light from a self-leveling line laser onto the card, which shows around 1 or 2 mm of sagging, which is nothing.
Pictured above are the front and back, showing the disassembled board. High-res versions are also available (front, back).