pi 4 on order so will try it and feed back - shame i bought 4x pi3b+ last week (friday) and the new launch was monday!! Still gots lots of use for em!
As I have built a cluster with these (48 pi's) i seriously recommend the blade quattro boards. ( https://cpc.farnell.com/bitscope/bb04b/ ... dp/SC14214
A single 12V 50A meanwell PSU powers 6 quattro boards each with 4 pi's on easily. The cluster is 12x pi2b 12x pi3b 16x pi3b+ with space left for 8 pi4 4Gb yay!!
Programming in a mix of elixir (and erlang) and python (at the edge)