It's a server motherboard with 8 GPUs crammed on it, facing up. The tall towers are the GPU heatsinks. I believe the blade looking things on the side are CPU RAM, the heatsinks on the back are covering the CPUs, and the little heatsink in the middle must be the CPU VRMs. Fans are in the back, and they crammed some electrical components on the front where all the IO is.
Looks like an HGX drawer, so there’s only GPUs on this. The heatsinks towards the front are probably on NVLink switches.
Ah you are right.
Just fyi, if 1 of 8 of the GPU's fail, you will be replacing the entire assembly; they are not modular.