I think the heat dissipation relative to volume of the ISS is way lower than these satellites, yet that already needs sizable thermal radiators to cool: https://physics.stackexchange.com/q/150004

GPUs are also very power hungry, I need about 2 square meter of solar panels on my room to feed a single RTX 5090 during summer. How many do you want to send up in a single satellite?

What about the data link? Real world Starlink speeds are capping around 300 Mbps. I understand that is a shared link with plenty of peers but what is a realistic bandwidth between these satellites and some fixed, earth receiving stations?

The whole idea of orbital data centres just doesn’t seem to pan out… the heat management issues are immense and the bandwidth is never going to be as fast as good old fibre