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‎04-28-2020 10:40 AM

HP Recommended
Product: Zbook 15 Gen6
Operating System: Microsoft Windows 10 (64-bit)

Received a  Zbook15-G6, intentionally ordered it with 2x4GB modules,  and will be adding 2x32GB Samsung modules ( DDR4 ,  PC4-21300 , 2666 MHz, SO-DIMM 260-pin, non-ECC).  

The original 2x4GB modules in slots 1 & 2 are not easily accessible (under the keyboard).   Slots 3 & 4 are easily accessible when the back cover is removed.

This PC will be used for memory intensive, engineering applications.

Is there any known performance degradation, if capacity in slots 1/2  (2x4GB) does not match slots 3/4 (2x32GB) ?       

The add-on Samsung modules do meet the Zbook15's published specifications.

Web search info is inconsistent, and seems dependent on specific motherboards and chipsets.  The Zbook User Manuals and Service Manuals provide zero guidance.

Any references to authoritative sources would be especially appreciated.

TIA

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