How Many Xbox 360 Versions Exist? Four Main Hardware Revisions

Four major motherboard revisions define the Xbox 360 lineage:

1. Xenon (2005) – Launch "Fat". 90nm CPU/GPU, external 203W PSU, notorious RRoD, no HDMI (early), no Wi-Fi.
2. Falcon / Opus / Jasper (2007-2008) – 65nm/45nm shrinks, improved cooling, HDMI added (Falcon+), 175W PSU. Jasper (late '08) largely solved RRoD.
3. Xbox 360 S "Slim" (2010) – Valhalla (45nm unified CPU+GPU), internal PSU, 250/320 GB HDD or 4 GB flash, built-in Wi-Fi (802.11n), Kinect port, whisper-quiet.
4. Xbox 360 E (2013) – Final revision. Xenia SoC (32nm), one-piece shell, dedicated Kinect port, no AV out (HDMI only), 320/500 GB or 4 GB flash.

Counting Nuance

Technically five distinct models if you count "S" 4GB and 250GB as separate SKUs, but four motherboard generations. All play the same library.