• ×
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
  • ×
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
We have new content about Hotkey issue, Click here to check it out!
HP Recommended
Ubuntu LTS

Just entered the community via procuring a Z420 with a (HP Z420 Workstation Intel Xeon E5-1650 V2 3.50GHz) . 

I then went "all" the way with a memory upgrade to "256GB Lot 8 HP 32GB 712384-081 715275-001 Samsung PC3-14900L DDR3 1866 4RX4 RAM".

And...got five beeps...

First tried clearing the CMOS with the button.  Then removed the memory I had just purchased, installing one stick at a time - thinking that perhaps of locating the 'bad' one(s).

And nothing.  I put in the non-error correcting sticks that the computer came with and everything booted up just fine.  And got lunch.

That's when I recalled my old days of building computers ( I like many today have gotten 'lazy' and just get laptops ) - but I recall the need to update the bios and started to read more about that process.


So my questions are - do I 'need' to update the bios?  If I do, in order to see the memory I'd like to install - is there any gotchas that I need to be aware of? 

Or is there something else I'm missing? ( This CPU doesn't works with the intended memory for example - something I'm not aware of...)




PS - You might have seen that the memory installed is not in the "proper" order, i.e.: 1->2.  This is how the unit came to me.  When I've been installing the new memory however, I have followed the proper ordering ( and actually tried random DIMMs as well. All to no success. )


Screen Shot 2022-09-23 at 10.44.35 AM.png

HP Recommended

According to Kingston memory finder, maximum memory is 64gb using 8 of the  8gb ECC

That is also documented in the configuration guide



Do no upgrade bios if there is any chance of bad memory or flaky system.

I had several Z400 and had to mix and match memory using memtest86 to see which sticks were different enough to cause problems when mixed.

Possibly the z420 has a memory tester build into the bios as good as memtest86


That kingston finder shows that 2Rx8 and 1Rx8 are allowed.  I would not mix single rank with dual rank.  Stick with one or the other.

Thank you for using HP products and posting to the community.
I am a community volunteer and do not work for HP. If you find
this post useful click the Yes button. If I helped solve your
problem please mark this as a solution so others can find it
HP Recommended

Only I have a friend with a similar setup. The only difference is their Bios is slightly newer and they have a slighter better CPU. 


Also, I guess my pic of my bios setting was removed.  I've removed my S/N - hoping that this might be of use to some.


Screen Shot 2022-09-23 at 10.44.35 AM.png

HP Recommended

the z420 had two motherboard revisions, with the later v2 boards preferred due to them being able to run faster undocumented cpu's and faster ram


it might be that you require "LR" type dimms (load reduced) when using 32gb dimms in the 6 slot dimm v2 motherboards

(the v1 boards only have 4 dimm slots as i recall)


the link below may be helpful to you:



HP Recommended

EDIT: DGroves posted while I was typing this... his link at the bottom gives my old links that I just tested and they don't seem to work anymore. I'll go dig them out and attach the ones related to the ZX20 v2 workstations.



That HP link you provided is old news, from 2012 it is related to the version 1 of the Z420. With the release of the Z420 v2 that workstation could support faster memory, 1866 MHz. Thus the statement in there "Speed • 1600 MHz, 1333 MHz and 1066 MHz DIMMs are supported • Memory will operate at the speed of the slowest rated installed processor or DIMM" is incorrect.


And, if you don't use one of the v2 processors approved for the v2 motherboard you won't get the max speed even if you have 1866 memory.


We in our enterprise have been using the v2 motherboards in our Z420 and Z620 workstations for years now, and the fact is that we use the exact same memory in our Z420 v2 workstations as our Z620 v2 workstations. All 1866 ECC buffered. I mainly install 8GB sticks because it is so reasonable in price from retired servers. I have tested 16GB ECC buffered sticks in both the Z420 v2 and Z620 v2. Those work fine too, but too expensive for our needs... 8 x 8 = 64GB is enough for the programs we run.


Some of the confusion revolves around "supported". Just because a memory type is not "supported" by HP may simply mean they did not do the extensive testing required to prove it would work.


To the OP:  The original poster shows his boot block date the presence of the v2 processor... that means he should be good to go. Please learn how to upgrade BIOS from within BIOS. I've posted here a number of times about that. It is safest, and it also is better to use the most recent BIOS.


I'll add in the newer PDFs showing the 1866MHz faster memory in official documents from HP. I sure wish they would have an archive that they did not keep screwing up. That should happen within the hour...


DGroves... Z420 v1 and v2 have 8 memory sockets like the Z620 v1 and v2. It is the Z400 you're remembering...

HP Recommended

Was typing when I saw your posting. Thanks so much. I actually was reading your posts and hence my thought to go 'all' the way.


As for the bios updating - you think that this is my issue then?  ( If so, could you point me to the most up to date / relevant post  you think I need to read.  Just want to cut to the chase and all. ) Thanks.

HP Recommended

to "SDH"...... is it only the chip revision on the v2 z420 boards that is different (like the z820  boards?)


i've never worked on the workstation z4xx/6xx lines, only the full tower z8xx lines


and have just acquired the two z240 sff/tower systems for home use to play with

HP Recommended

Ok, so I updated the BIOS;however, still getting 5 beeps when I install the new memory.  I have 8 sticks in total - I can't believe that all are bum.  Made sure that they are seated nicely.

Any other ideas I ought to try?


Screen Shot 2022-09-23 at 2.11.25 PM.png

HP Recommended

DGroves: For the Z400 v1 there were only 4 memory sockets and for the v2 they got 6 sockets. It was an early way to figure out how to get the later better version. For the ZX20 v1 vs v2 I believe it was the same issue for all... needed a different chip. Early on HP thought they could engineer around the need for another motherboard version and thought they could get the v1 and v2 processors to run on the same original motherboards.  This is based on an interview with the HP director of workstation development on the day of the ZX20 v1 launch. We're lucky with the ZX40 family... all those can run both the v3 and the v4 processors.


To OP: I've attached some of the PDFs which apply to the 1866 MHz ECC buffered memory HP used in the Z620/Z820 that works perfectly also in both the v1 and the v2 motherboards of the Z420. One gof the PDFs provides HP part numbers, but I found that the same memory HP used was also used in other same-era servers from IBM/Lenovo/Dell. Hence, as the servers were retired the memory glutted the market and scroungers like me could recycle it. Servers tend to get retired significantly earlier than workstations that can use the same memory. I know HP writes about using ECC unbuffered in the Z420 and ECC buffered in the Z620/Z820 but we've self-validated that the same ECC buffered memory works great in all 3 of those ZX20 upper level workstations. I think HP never did the validation testing because the Z420 was kind of the red-haired stepchild when compared to the fancier Z620 and the Z820 ones. Plus, memory was way more expensive then and the idea was that if you could only afford the Z420 you also could not afford the bigger more capable memory sticks. Things have changed...


My advice is to get four of the 8gb sticks I describe below and pull all the other memory and just load into the 4 dark color sockets you have. If you like that you can add 4 more later into the white sockets.


I did test with corresponding 16GB ECC buffered (= "registered) server sticks in the Z420/Z620 v1/v2 and it worked fine. The amazing thing that when I did test with both those same 8GB or 16GB sticks in a Z600 v2 that also worked fine. The memory speed was downregulated to the fastest those older workstations could run (1333 MHZ) given that they had the highest speed (1333 MHz) processors also. Here is a copy/paste from the past:


"One of my HP forum friends, the guy who has mastered PassMark, got me a tip... There is a specific type of server memory 8GB sticks, ECC, buffered, rated for 1866MHz (14900R) speed that can be bought used off eBay. The version 2 ZX20 motherboards running the fastest HP-certified v2 processor(s) cannot run faster than this speed and work well with that recycled memory. 


This HP/ IBM/ Lenovo/ Dell ECC buffered server memory works just fine in the Z620 v2 and also in the Z420 v2, and I have even tested it also in the HP Z600 v2 where it also works fine (but downregulated to 1333MHz max speed to match the fastest processors for that workstation).  NOTE:  It does not work in the Z400 v2 running the fastest HP certified processor for the Z400 v2.  It will auto-downregulate its speed if a slower processor is present. Also, I discovered that same version of 4GB sticks are actually the same price or greater on eBay than the 8GB sticks (unless one has incredible hunting skills and great memory-buying karma).  This is because there were many more 8GB sticks sold for now-retired servers. I bought mainly the Samsung version for our projects.


The Samsung version has this code:     M393B1G70QH0-CMAQ8M but I also have seen M393B1G70QH0-CMA. I simply search eBay for the second one and the results usually also include the first code sticks.  The alphanumeric after –CMA are not of value for finding these sticks.


There are equivalent alternative sticks to the Samsungs you could buy, but if you choose to do so it is ideal to at least get all from a single OEM... all Samsung, or all Micron, or all SKHynix, and surely all of the same rank (single rank is preferred), all ECC (required), and all buffered (strongly preferred over unbuffered):


The Micron version has this code:         MT18JSF1G72PZ-1G9E1HE

The HP SKHynix version has code:        HMT41GR7AFR4C-RD T8 AD

The Lenovo SKHynix version code:       HMT41GR7AFR4C-RD T4 AB

The Dell SKHynix version has code:      HMT41GR7AFR4C-RD T4 AD


I have bought these 8GB sticks for as low as 10.00 each including shipping. This was from a rare find of untested sticks sold “as is” from a highly rated seller.  My friend paid about 14.00 for each stick, but they were tested. In all my memory buying over the years server grade memory from Samsung just does not seem to fail. So, my cost with tax and shipping was under 100.00 to load up on 64GB.


There is a specific synergistic benefit to having all slots filled with identical memory, so for any of our workstations with 8 x 4GB sticks I'm happy with that. I’m also sure a 4 x 8GB sticks build would be just fine for our Z420 v2 workstations. 8 x 8GB has been tested with no perceptible benefit for our particular type of real-world work.


Memory costs for the ZX40 next generation of workstations is another issue (which is partly why I still recommend the Z420 so strongly). In the ZX20 v2 workstations one can get the best v2 processor upgrades at a reasonable cost.  We do not need to run dual processors (which a Z620 can do).  Processor upgrade costs for the ZX40 workstations (which use v3 and v4 processors) are significantly higher. Even for the older Z620 “v1” workstations there are some very good processor upgrades, but I prefer to instead ugrade the v1 motherboards to a v2 version motherboard as the first step... that is quick and easy, and inexpensive."


Here's some quick info on the 16GB sticks I tested in our Z420 builds and even in a Z600 v2 build:

712383-581 1866 E2Q95AA (and I have seen SAM/SKH/Micron versions of these.


The HPE version. There also is a 712383-081, 1866 MHz, with Spart P/N of 715274-001 on its HP holographic label.


The Samsung version I tested with:  M393B2G70QH0-CMAQ8 M 16GB 2RX4 PC3-14900R-13-12-E2-D3 (or D4)


Attached below are ZX20 version HP memory white papers, plus a DDR3 PDF for the v2 sticks. As stated above, ignore the Z420 unbuffered statement... from years of experience.



HP Recommended

I think the problem is my CPU:  https://www.truenas.com/community/threads/do-e5-16xx-v3-v4-support-lrdimm.77210/


I've ordered a e5-2695 v2.... Will see if this solves the issue.  ( Just need to find that tube of thermal paste... ) lolz

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.