to put it into numbers - at 80C (353K) 1m2 radiates 880Watts
I think though that instead of the Moon we'll be putting data centers into orbit - for 1KWt GPU we'll need 5m2 solar panels and 1m2 radiator - all together under 10kg, ie. $1000 at Starship prices while the GPU itself is $20K+ .
The kicker here is that the Starship launch price is cheaper than installing solar on the ground ( $2K/KWt and higher)