I’d never looked at this. In a set that’s easy to check, I get the following:
7 with 928MB (5 are hAPax3, 2 hAPax2)
2 with 960MB (both hAPax2)
In case someone want to script it in bash/zsh:
user=admin; for x (10.99.100.31 10.99.100.41); ssh $user@$x ':put ([/system/resource/get total-memory] / 1024 / 1024)'
(change user= to your user & no I don’t use “admin” just for example 
)