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by throwawayish 3388 days ago
n-P / n-S / n-way = how many sockets/processors a system has. A 1S system has one socket / processor, a 2S system two, a 4S four and so on.

x U (or x HE, if you're talking with a German manufacturer, they like to make that mistake ... ;) are rack-units, i.e. how large the case is.