It's quad core CPU with one faulty processor. It could be nonfunctional or just some parameters of it are outside of specs range.

>You mean this is like the 8K memories for the old Spectrum - actually 16K where one side didn't work so Sinclair got them really cheap? I.e. a quad core processor where one of the four doesn't work? Wouldn't be anything new - even to me. I wonder why is that, they lock one to have a processor which fits the price niche, or they are selling a series of quarter-faulty quads as trios?