Radoslaw writes
> The memory is not unique design. There are regular DIMMs inside the
> book. High quality, ECC, good brand, but still same technology as in
PC.
> Memory controllers are probably completely different, but the
"back-end"
>   (DIMMs) are not.

The PARTS that are used in the box are pretty much the same as other
commodity parts. True enough.

The DESIGN of the way they are put together, the circuitry, EDC/ECC,
page-modes etc. are predicated on the TSO (ie "total store order" not
timesharing option) memory model and the z architecture storage
consistency rules documented in PoPs. 

The DESIGN of the z memory subsystem (and caches) is only distantly
related to the memory subsystem design in a commodity PC.

CC

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