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If you've got around £600 to spend, going for anything other than i7 is a waste of money. If you've got half that, go for a quaddie and clock it.
I do actually, need a case and everything that's in itand a monitor.
I use my pc for pro audio (DAW) and im finding it hard to get the CPU meter in Nuendo to go over 12%! thats at stock speed! music software is very cpu intensive, im not a gamer so cant comment on that side of things.