

Well, I wouldn’t call them a “scam”. They’re meant for a different use-case. In a datacenter, you also have to pay for rack space and all the servers which accomodate all the GPUs. And you can now pay for 32 times as many servers with Radeon 9060XT or you buy H200 cards. Sure, you’ll pay 3x as much for the cards itself. But you’ll save on the amount of servers and everything that comes with it, hardware cost, space, electricity, air-con, maintenance… Less interconnect makes everything way faster…
Of course at home different rules apply. And it depends a bit how many cards you want to run, what kind of workload you have… If you’re fine with AMD or you need Cuda…
I think there are some posts out there (on the internet / Reddit / …) with people building crazy rigs with old 3090s or something. I don’t have any experience with that. If I were to run such a large model, I’d use a quantized version and rent a cloud server for that.
And I don’t think computers can fit infinitely many GPUs. I don’t know the number, let’s say it’s 4. So you need to buy 5 computers to fit your 18 cards. So add a few thousand dollars. And a fast network/interconnect between them.
I can’t make any statement for performance. I’d imagine such a scenario might work for MoE models with appropriate design. And for the rest performance is abysmal. But that’s only my speculation. We’d need to find people who did this.
Edit: Alternatively, buy a Apple Mac Studio with 512GB of unified RAM. They’re fast as well (probably way faster than your idea) and maybe cheaper. Seems an M3 Ultra Mac Studio with 512GB costs around $10,000. With half that amount, it’s only $7,100.