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HP Z800 RAM Upgrade

HP Recommended
HP Z800
Microsoft Windows 10 (64-bit)


I am trying to do a ram upgrade on my hp z800 from 12GB to 48GB.


In my inventory, I have these 2 types of ram, 


help me figure out which one works better?


1. Samsung M391B5273DH0-CK0 M 1325 (4GB 2Rx8 PC3-12800E-11-11-E3)


2. Samsung M391B5773DH0-CK0 M 1218 (2GB 1Rx8 PC3-12800E-11-11-D1)


I have enough to fill all the slots.


or do I need to buy a different kind of ram that works?

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HP Recommended

first of all you can not mix ram types/capacity


you have 2gb sticks that are "1 rank"


you have 4gb sticks that are "2 rank"


the z800 uses a tripple memory controller, so you have 3 banks of memory each bank has 3 slots for memory


For single processor configurations, configure memory in sets of 3

For dual processor configurations, configure memory in sets of 6


so, i recomend  if you have dual cpu's fill all  banks with 4gb sticks if you have that many


if not buy  at least 4gb modules to fill each slot (24GB) ,  or six 8 gb modules  (48GB) if you can afford it if using dual cpu's


just make sure that you fill all 3 memory banks  with the same type ram (6 banks if dual cpu's)


read this pdf on memory config

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