My whole set-up, monitor is an Asus PB287Q 28" 4K 60Hz 1MS, Cambridge Audio Topaz AM1 amp, Wharfedale Delta 30.2 speakers, Cherry mouse and keyboard (I don't like fancy mice or keyboards, these cost £30 for the pair and are absolutely fine).
4k gaming is so-so, most games work but because the game textures aren't designed for 4k I find the benefits are marginal. Most games I've tried it's just not worth the heat and noise running 4k. Sims 4, Rome 2, Elite Dangerous, Wargame European Escalation, Civ 4, Metro 2033 Redux all look better at 2560x1440 with the setting on full compared to 4k with the AA off (the FPS is usually lower in 4k too). May just be me but I find running games in 1440 with AA on full on a 4k monitor looks lovely, the wife's Sims 4 looks like a Pixar movie and Wargame looks like Google Earth at times.
What I was surprised at was my Skyrim Realvision ENB mod actually runs fine in 4k and is quite happy with the SLI despite people saying ENB and SLI don't get on. I do actually have some 4k textures in my mod as well as many 2k textures and you can really tell the difference. Only thing is the characters, their weapons and armour are all crystal clear and the furniture around them is all fuzzy pixels.
Top GPU runs about 10C hotter than the bottom one, the 3 120mm fans does seems to help as the bottom one basically blows right in the gap between the two. The windforce coolers on the GPUs do seem to manage to keep them from going much over 80C during benchmarking but they do get a bit noisy when they get up to the higher usage percentiles.
No photo of the other compartment as it's just a mess of wires with a glowing white PSU block in the middle like some kind of Borg creation.
That's about it, thanks for having a look