It is the little USB WIFI dongle. When it is plugged in. GPU usage goes up to 99% and the card heats up. Unplug it and usage goes down to 20ish% and card cools down.
All games, but the definitive result came from heaven benchmark. On max, 20 fps at the start, unplug usb wait a bit fps doubles, plug in fps drops, unplug fps goes back up.