@sheogorath the 50% is explained in the article itself. It is a conservative assumption on cloud data centers being twice as effective utilized as local small DCs. Therefore comes the conclusion that a cloud server needs half the hardware as a dedicated local one. But still not sure if this assumption would hold up.
@fooker I see, in the paragraph they talked about utilisation and energy consumption, which I assumed meant basically the same. But it makes sense to translate that to amount of machines to have around.
Either way, thanks. And I'm with you, that I don't think the assumption of "more utilisation" means less hardware works out.
Especially considering that according to RH, depending on your use-case, you can get twice the performance out of baremetal compared to public cloud VMs :D