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- Question regarding Memory Rank

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11-05-2018 07:43 AM
I want to upgrade my workstation Ram. everything is perfect DDR 3 8GB 1Rx4 PC3 14900R . But I need to do upgrade up to 16 to 32 GB. Everythihng correctly Matching PC PC3 14900R DD3 . Only Rank is not matching which is 1Rx4 . So what will be the solution. Why rank do not matching? I believe the reason is its 16 GB . dual rank. so please advice it. Can I use Single 16GB or 16x2 32 GB Ram?
my actual installed ram is this one : https://memory.net/product/hmt41gr7afr4c-rd-sk-hynix-1x-8gb-ddr3-1866-rdimm-pc3-14900r-single-rank-x...
I want to installed : https://memory.net/product/e2q95aa-hp-1x-16gb-ddr3-1866-rdimm-pc3-14900r-dual-rank-x4-replacement/
reference : http://www8.hp.com/emea_africa/en/products/oas/product-detail.html?oid=5394267
11-06-2018 06:38 PM
the z820 can work with memory of diffrent ranks,
however all memory in each bank must be the same size/speed/rank/capacity
read the link below for more information
http://isvpatch.external.hp.com/HPPTF2/drvlib/docs/Z820_Memory_Configurations.pdf
11-06-2018 06:50 PM
Thanks for the link. most time I try to download it from HP side. But its not working.
another issue My installed ram is 1RX4 . Hp suppport suggest me to Buy 1GX4 . is that work? infact if I put my parts number then I see suggestion from HP site too.
11-06-2018 06:57 PM
11-06-2018 07:01 PM
the z820 can work with memory of diffrent ranks,
=== Interesting I read this now. So you mean to say if 1RX4 and 2RX4 or 2RX8 it will work? Bus speed, Type, All other correctly match. only rank never match. But support don't want to provide any other parts. They said pc will damage etc
11-06-2018 08:16 PM - edited 11-06-2018 08:21 PM
for the last time,.......dimm rank is not a issue
AS LONG AS ALL MODULES IN A BANK ARE THE SAME RANK/SPEED/CAPACITY/SIZE the z820 will not have a problem
in other words
bank one can have dims that are 2 rank installed (all dimms in the bank must also match in capacity/speed)
bank two can have 4 rank dimms installed (all dimms in the bank must also match in capacity/speed)
bank 3 can have 1 rank dimms installed (all dimms in the bank must also match in capacity/speed)
bank 4 can have 4 rank dimms installed
11-09-2018 12:07 PM
Looks like my idea is right. But what do you mean by RAM bank?
is rank bank mean per challenge. or per group of slot? Hp z820 sample installed I see and understand correctly. that indicate as ram rank need to be same.
But I also see something else. in the diagram. If I installed 8 GB in Slot 1 . then need to install another slot 8 .
Everything match expect rank. DDR3 Speed/capacity/RDIMM etc
last I found something when I search using my parts number. I see Hp parts only mention 1Gx4 or 1Rx4 . even 16 GB. Not 2RX4
Bank will help me to know the answer almost close. a Ram specialist saied. you can not mix together. But similar ram you can install
11-09-2018 12:28 PM
look at the side cover of your z820 note the picture showing the ram slots
now refer to the link i gave you showing you the correct way to fill the slots when using 2gb modules in all 4 slots
this installs the same ram size in all 4
read the document!!! note the section
Total of 16 memory sockets
• 8 memory sockets available per CPU
• 4 channels per processor and 2 sockets per channel
in other words 2 memory sockets = 1 bank
http://h20331.www2.hp.com/Hpsub/downloads/Z820_Memory_Configurations.pdf
hp only tests/recomends HP ram, why is this suprising to you?
do you really think they are going to recomend a competiors product/ram?