Steam Machine's Tiny Mainboard Pushes Pico ITX to the Limit
Valve’s teardown reveals the Steam Machine uses a nearly Pico ITX–sized motherboard (about 100×72mm), smaller than standard Mini ITX. It packs an AMD CPU/GPU, four 2GB VRAM modules around the GPU, and a single 16GB DDR5 SO-DIMM (a second RAM slot is unused). The board sits on four corner posts, and a full cooling assembly is visible in Valve’s teardown photos for Digital Foundry, highlighting an impressive feat of hardware miniaturisation.