RAM Increase

[kaushikrahul]

Hi There,

                 I have an HP Z4 G4 Workstation with 32 GB RAM (8 GB X 4) and Intel(R) Core(TM) i9-7900X CPU @ 3.30GHz   3.31 GHz processor. 

                      I need to install additional (16 GB X 4 ) in this workstation. Doing this, gives error red blink in CPU during SwitchOn.

Please help and provide solution. 

[BeemerBiker]

I have that same i9-7900x CPU but a different system and ran into the same problem: wrong memory type.

Memory problems are described on top of page 51

https://kaas.hpcloud.hp.com/pdf-public/pdf_6775743_en-US-1.pdf

Please read the following description of Z4 G4 memory options.  I am not recommend the company,  just recommending their suggestions and the listed memory which is RDIMM

https://memory.net/product-category/hp/z4-workstation/z4-g4-workstation/

According to bios release for the Z4 G4, the 2.91 core x bios quote:  "Added support for a new DIMM manufacture"

Please put the old ram back in and verify you  have 2.91 core-x bios.   Can you take a picture of the label on both the new and old ram and post it here?

I had to return my 64gb of ram and get low density (double sided) UDIMM that was DD4-2666.  I believe your system needs RDIMM.  If your old memory is not RDIMM then the new memory needs to be low density with chips on both sides and limited to 2666 type.

[kaushikrahul]

Previous Configuration: 4 X 8GB = 32 GB (SAMSUNG DDR4- 2666 (Part No: M378A1K43CB2-CTD))

New configuration which is causing problem: 

4 X 8GB = 32 GB (SAMSUNG DDR4- 2666 (Part No: M378A1K43CB2-CTD)) + 4 X 16 GB (KINGSTON DDR4-2666 (Part No: KVR26N119D6/16

Please tell if the issue with loading sequence and tell appropriate loading sequence  

[BeemerBiker]

Hi Again.  Sorry, been a week, I just saw you still have problems.

All that ram should work.  Possibly it is not being loaded in the right order.  Each pair of match ram should be in the same channel

Look at bottom of this document

https://h20195.www2.hp.com/v2/GetDocument.aspx?docname=4AA7-2219ENW

start with the 16gb put them in 

1,2 then 3,4

if problem run memory diagnostics starting with one stick.  Then add the 8gb sticks once the 16 are all recognized.

The expert @DGroves covered the above here

[kaushikrahul]

How to Run Memory Diagnostic. I have loaded only 16 GB X 4  RAM in the suggested lading order. They are still not working. 

[DGroves]

xeon board Ram specs: (ECC registered ram)

https://www.kingston.com/en/memory/search/model/97125/hp-hpe-workstation-z4-g4-xeon

Core "X"  IE- core i7/i9  motherboard  (non ECC Registered ram)

https://www.kingston.com/en/memory/search/model/98171/hp-hpe-workstation-z4-g4-core-x

Since these platforms have 4 memory channels, YOU SHOULD INSTALL memory in sets of 4

rather than sets of two

the minimum is one module in each of the 4 black memory channels

• Proper individual DIMM capacity selection is essential to maximizing performance.

Evenly distributing total desired memory across all operational channels

and CPUs will deliver the best performance.

Loading rules
• Load the memory modules in order of size, starting with the largest module

and finishing with the smallest module.

• Each channel includes two DIMM sockets; black and white connector pairs represent a channel.

The DIMMs should be loaded first in the black sockets and then in the white sockets.

The DIMMs should be loaded starting with the DIMM furthest from the CPU,

with the first DIMM loaded in the top most socket and alternating sides of
the CPU.

here's the full document describing the memory load order for both motherboard versions (xenon/Core X cpu's)

https://h20195.www2.hp.com/v2/GetDocument.aspx?docname=4AA7-2219ENW      (pages 19/20)