2400cc Inference Racer: Dual RTX 3090 motors, NVLink turbo, naked 7840U ThinkPad ECU, VW Golf radiator

Today I present a fine piece of engineering, carefully assembled inside a custom chipboard chassis: the 2400cc Inference Racer , a.k.a. my winter heater. Power comes from two second-hand AORUS RTX 3090 XTREME WATERFORCE cards. One glows a beautiful teal, the other red. I have no idea why, nor how to