About as tiny as a PC can get, Raspberry Pi 3 loaded with RetroPie. I am getting this for my sister as a xmas gift this year and I think she will love it. When we were kids we used to own some of the old consoles and we played it a lot then. Couple years ago our original SNES bit the dust so I wanted to bring back its joy. I know she already has a PS4 so she can use those controllers with this box just fine. Just to show scale of size I added a couple pics of it next to my wrist watch to compare.
I decided on getting a case that had a built on fan for it. Technically the raspberry pi doesn't need heat sinks on its chips and doesn't need a fan but I feel safer with it on. I plugged the fan into the 3.3v line instead of 5v line so the fan would make virtually no noise and I should not have to worry about this overheating at all. The 32gb micro SD card is plenty of room for my game library for consoles before the PS1. It has built on wifi and bluetooth with 4x USB 2.0 ports and HDMI out.
I would have made a thanksgiving joke with this build if I were in the US but I am in Canada and ours was back in october. I know the US has theirs in 3 days from the time I am posting the build.
Super cheap all in one PC, has a quad core CPU, built in wifi and bluetooth.
Fast and plenty of space for the cheap price
Comes with added cooling to add to a raspberry pi with heat sinks and added fan that is positioned right above CPU heat sink for cooling. The 4 bolts that hold the fan in place had a 5th bolt and nut in the bag incase if you lost one. The USB power adapter has a built on switch since you turn a R-Pi on and off by plugging in power so with the switch you save the life of the port on the Pi. Super cheap price for what you get and the fan is virtually silent when powered at 3.3v and still much quieter than an intel stock cooler at 5v.