memory demand


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Hello everybody and especially developers,

I have a question concerning the memory and procesors demand to perform a molecular dynamics or QM/MM on medium sized clusters (also plane wave calulations on solids):
what is the least demand on the hardware? how many processor cores and RAM should be available and moreover, how much memory capacity theses calculation usually need ?
I should mention that our university needs these data, in order to assign the correct memory demands  !

thank you in advance!
greetings
Alfred