It contains crystalline prose like this, something all technical manuals should aspire to:

"Digital technologies are driving major industry shifts, ushering in a new age. In the Cognitive EraTM1, it is either disrupting or being disrupted. Tomorrow’s disrupters will be organizations that can converge digital business with a new level of digital intelligence. A key in digital transformation is the ability to accelerate the innovation of new business (Internet of Things, Cognitive, and Virtual Reality), while keeping complexity in check."

The answer to your question, by the way, appears to be 'very'. You can have lots of processors and 32TB of RAM.

It features the next generation of IBM's CMOS mainframe technology, with a 10-core CPU chip using 14 nm silicon-on-insulator technology, and running at 5.2GHz, claimed to be the fastest processor in the industry. Each core has hardware accelerated encryption implementing a CP Assist for Cryptographic Function (CPACF). The CPU also has 1.5 times more on-chip cache per core compared to the z13. There can be up to 32TB of memory, three times the z13 maximum, and its IO is three times faster as well.

They are also built like a tank, and have so many levels of redudancy and reporting that if any component breaks in your machine they guarantee there won't be any downtime (and a technician is dispatched to fix it automatically). That includes things like CPU cache line bridges, complete cooling failures, storage failures, etc. Also they guarantee that every new version of the mainframe will not increase power consumption (which is absolutely insane).

Oh, and the bill will make you dizzy.

Really, it's the way that non-computer people think that all computers are but actually aren't because they aren't mainframes.