At this point what you really need is an incredibly powerful heatsink with some relatively small chips pressed against it.
If you disassemble a modern GPU, that's what you'll find. 95% by weight of a GPU card is cooling related.
Transhcan Mac Pro was this idea, triangular heatsink core cpu+gpu+gpu for each side
If you disassemble a modern GPU, that's what you'll find. 95% by weight of a GPU card is cooling related.