Heat is where the math breaks down. If you examine the heat the ISS is able to deal with (about 70 KW) vs say a H200 SXM5 (700W), you can stick a grand total of 100 units there, or about 12 nodes. This isn't even accounting for supporting infrastructure, compute, etc., nor are we taking a power source into account.

Either there's a revolutionary heat dissipation system in the works they're keeping a secret, or my ass is getting a smoke rash.