Built this years ago when the 4790K was new and have only upgraded the video card since then (GTX 970 originally). Strictly for gaming.
Windows 10 Pro
Corsair 250D Mini-ITX case
Intel i7 4790K (OC)
Corsair H100i V2 water cooler
Asus Z97I-Plus motherboard
Asus GTX 1080 Ti Turbo
16GB RAM
480GB M.2 SSD
Asus 34" ultrawide (3440x1440)
It was a pain in the ass squeezing it all in that tiny case, though. Given all the hassles of small case builds and the costs of parts these days, I think I’m going with something prebuilt for my next gaming rig. Maybe this, with the idea that I’ll be doing all my gaming from the couch in my living room:
https://www.corsair.com/us/en/one
I do all my work on a 2015 MacBook Pro with an external Dell 27" 5K display.