We use a 2 PC stream setup in an array of 3 computers. The 2 "gaming" computers are identical in specifications, while the dedicated streaming PC is slightly less powerful overall. The gaming computers are directly connected to the streaming PC, as well as any consoles.
Below are the main specs for each computer. Note that the power supply, case, monitor and other random peripheral components are not listed as they are not performance essential to the build.
Gaming PC
Motherboard - Gigabyte GA-Z170X Ultra Gaming
Processor - Intel i7-6700K Processor
Ram - G.SKILL TridentZ Series 16GB
Video Card - Zotac GeForce GTX 1070 Amp Extreme
Hard Drive - Toshiba OCZ Trion 150 480GB 2.5"
Microphone - Audio-Technica ATR2100-USB
Webcam - Logitech C922x Pro
Streaming PC
Motherboard - Gigabyte GA-Z170X Ultra Gaming
Processor - Intel i7-6700K Processor
Ram - G.SKILL TridentZ Series 16GB
Video Card - Zotac GeForce GTX 1060 Mini
Hard Drive - Crucial MX300 750GB 2.5"
Capture Card - El Gato HD 60 Pro
Gaming PC 1 / PS4 Slim (Top) / 2x CyberPower UPS (Bottom) / Streaming PC / Gaming PC 2