The processor does not matter as the GPUS are the main reason for this rig, you could probably still mine on the CPU, one extra hash is one extra hash, right?
It only has to do one job, is not a media centre or gaming PC... Nice looking unit anyway, looks well made too. Would be good if there were a choice of PSUs if you did not want to utilize or need all that power.
Complete rubbish !
Dependant on what coin you mine, the cpu and ram can have a massive effect on gpu performance. You must only mine a limit range of coins.
Several coins i mine require 4gb ram per 1080ti, and at least 1 dedicated thread per card, otherwise hash rate can half, or sometimes you cannot even utilise all cards.
I have been using a min of quad core (8 threads) and 8Gb ram in all my rigs for over a year now, and it makes a difference (to some coins)