Samir D 

What if i put 8 of this module in PN: 712383-081, Samsung. Will the speed of the memory clock down?

Samir D 

I have hp z420 v2 with a e5 1750 v2 cpu.

I have 16gb 14900e now running 1866mhz. I would like to upgrade to 8 x 16gb 14900r would they run at 1866mhz?

Jon Yes it will.  And this is common for any normal registered ecc ddr3.  My servers that take this stuff clock it down too after you have so many modules.

Jon I'm not sure if udimm ecc clocks down in the z420.  I know ecc reg will clock down.

Samir D so its better to buy 8x 8gb 14900r? I can get a great deal for 8x 16gb 14900r.

Jon Registered ecc is going to clock down once you fully load all the channels, no matter what the size is.  How much are you getting these for?  If they're under $1/gb it's a good deal, but anything more than that is too expensive imo.

Samir D 

Oke too which mhz shall it clock down.

i can get 8x 16gb for 110 euro include shipping.

Jon That's a pretty good deal. :)  So the clocking down depends on the max ram speed of the processor, not the ram.  So for example, my z420 has an e5-2630L which has a max memory speed of 1333Mhz.  Even with with 1866Mhz ram running at full speed, it will only run at 1333.  Then it will clock down as you fill up the banks.  I can't find the exact documentation that states in what stages it will clock down, but it is common that it will drop to the next slowest clock speed as the number of overall ranks increase.  So 1333 will drop to 1066, and then to 800Mhz.

Samir D 

Thanks for the info, i will let you know when i order them. In my other hp z420 v1 i have 64gb running at 1333mhz

Jon Sounds good!  Should be a solid plan. :)  I've got a v1 and I have 8x 32GB LRDIMMs in it.  Those things get HOT though so you need the front memory shroud.  It might not be a bad idea for you to get one if you don't already have one.

Samir D 

Thanks I was searching and found 1 on ebay i email the seller, i also wanna buy the front fan. Check out this topic. https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/Z420-Missing-memory-fans-and-air-baffles-part-numbers-please/td-p/7522856

Jon That's a good reference as SDH on there knows a tremendous amount about the z series.  Be sure to also check out hp partsurfer for a complete listing of all the parts for the z420:

http://partsurfer.hp.com/Search.aspx?type=PROD&SearchText=B5N55LT

For my z420, I found the cost of the front memory duct a bit off putting considering I could get a dedicated aftermarket memory cooler for less, and that it wouldn't be forcing the hot air through the power supply, so I went that route getting the first picture in this link:

https://graphicscardhub.com/ram-cooler-heatsink/

It works very well and was cheaper than the duct.  I simply converted one of the drive power to power the fan on the cooler.

Samir D 

Thanks for the link. Ill wait when i receivs the memory then i will order the front memory shroud..

Jon I would check how hot the modules get.  I discovered the heat when memtest started having errors and those modules were much hotter than the other ones that had the stock fan.  I rigged up a simple case fan pointing at the second memory bank and the problem went away so I knew a memory cooler would solve the issue.  I also knew this was some serious heat that I really didn't want going into the power supply like it is originally designed--something to consider.

Samir D 

Hmm ok how did you test the memory heat. I have now a hp z420 v2 with e5 1650 v2 @ 3.50ghz 4x 4gb 14900e (16gb) totaal. I dont have the front memory shrouder. But planning to buy it. For the rest i have a saphire rx580 nitro + speciaal edition card and samsung 500gb ssd. And 1 tb wd sata drive.. how to test the memory heat

Jon It was actually pretty simple.  I ran memtest and stressed the memory.  When I started getting errors, I was wondering why.  I shut off the system and unplugged everything and opened the case and felt where there was heat--the memory modules were hot enough to burn my hand if I held it there.  So I took off the memory fan cover on the other side and felt those modules and they were only warm.  My guess was that the front memory bank was overheating, so I plugged in a spare fan and put it inside the case facing against the second bank of memory and re-ran the memtest.  No more errors.  I felt the modules when I swapped to another set I needed to test and they were no longer scalding hot.  Then I debated the front memory shroud versus a memory fan.  Finding a very good condition secondhand memory fan for cheap made my decision.  I installed the memory fan and re-ran a memtest--passed with flying colors.  And now the system is in production. :)

Samir D 

Ai thats a good test indeed. I wonder how my memory are now. But will see when e receive the 8x 16gb 14900r. And then order the front memory shrouder. Hope that work for me

Jon Yep, was pretty easy to diagnose the issue.  Easy way for you to find out is to run memtest overnight.  If it passes that, your current cooling is fine.  Then run the same test once you have your new ram and memory cooler.  If it is not going to work, you will start to have memory errors once the heat is too much. 

One thing I also did was set all my fans in the bios to 100%.  I always run my systems that way--I had a motherboard die once because pwm didn't kick in when an ac system failed.  With 100% fans I have no risk.

Samir D 

I received the memory today and just installed them, they are running at 1866mhz. By removing the old memory i noticed the front memory are a bit warm. So im gonna buy the hp front memory shrouder

Jon That's awesome!  Always great to see so much memory on the z420. :D  If it's warm in just normal usage, then a memtest will probably stress it to the point of errors.  Once you have the memory shroud in position, run memtest on a continuous loop to test all 128GB.  It will probably take almost a full 24hrs to test that much ram as my 256GB took 34hrs.  With the shroud in place if you have any memory errors, stop the test and feel the temperature of the memory, and if it is too hot, get a memory cooler with a fan as the shroud isn't enough.

Samir D It's super to see it running at 1866Mhz too--that's just killer. :)

Samir D 

Will order the shroud and see, but its not a.problem because my pc is not on all the time. I just use it for gaming and youtube etc.. 

Samir D 

Yes indeed it is. I was doubting if it will clockdown. 

Jon It could be a problem because any continuous use of memory that uses those modules could overheat and cause system crashes.  Better to test and take preventative measures than find out after the damage is permanent.

Jon From what I've read it should have clocked down with all the slots full, but I'm glad to see it didn't. :)

Samir D 

yeah im also glad that it didnt clock down., i just order the memory shrouder and also the front fan, got them both for 50 euro.

Jon Let me know how the shroud seems to work for the heat.  I'd be curious since I never got one.

Samir D I have the shroud and front fan mounted in my pc. but i didnt run the memtest because i dont use the pc all the time, i use it most for just music and sometime gaming. but it run fine. my settings are.

E5 1650 v2

128gb ddr3 running at 1866mhz

Samsung 860 EVO 500GB

WD Blue 1tb

Sapphire Nitro+ RX 580 8G G5 SE

Creative Sound Blaster X-Fi SB0460 XtremeMusic PCI Sound Card SB0460 

Jon Thank you!  I ended up adding a corsair memory cooler and it keeps everything cool. :)  I don't think I would have wanted that heat going through the power supply anyways.

David David 

Check in the bios or on the mothetboard.

Jon  Thank you for your fast response. If I have the below board is it V1 processors only for me?. I've just bought a RX580 8gb GPU and hope this cpu won't bottleneck it.

David 

The bootblock date you can see. If it is 2011 its v1 if it is 2013 its v2.. i alao have rx580 8gb. I had ir dirat in my v1 but now in my v2. Make sure you have a 600 watt psu

Jon  Thanks for clarifying that. I have the factory 600W PSU and have just upgraded to 16gb ram (2gb x8). I'll see how it performs and consider V2 processors if it's badly affecting FPS. What V2 CPU did you match your 580 with?

David 

I also have 16gb 4x 4gb 14900e in my v2 systeem. But i just order 8x 16gb 14900r. I have a e5 1650 v2 @ 3,5ghz

Jon I was quite confused by all the memory types to be honest so bought identical ram to the modules that came with the PC. I knew they ran at the fastest speed the CPU would allow 1600mhz as per the Intel website. 16gb ram is plenty for me at the moment. Thanks for your help today, it's great knowing I've better upgrade options for the future with V2 CPU's. 

David 

Yes 16gb is enough actually but i got a good deal for the other module. And mine is running at 1866mhz. I got some of the 12800e memorry if you need

Jon Thanks for the ram offer. I don't want to spend any more money on this build untill I can confirm it's still working. I'm on a tight budget already. You see I took out the Nvidia K600 that came with it to photograph and sell, and when I reseated it there was no video out ( persumed broken) I'm now patiently awaiting my 580 from Amazon as I don't even have another GPU to run diagnostics. I got the PC for €17.70 with 8 gb ram and the RX580 was £158 new. If I didn't break the k600 the whole build would of ended up costing be about €190. Fingers crossed it still works, if broken I'll just sell RX 580 and pc parts and move on. 

David ok ok i understand..

David It's hard to break a gpu.  I would just check how it was seated.  These aren't fragile consumer systems so it shouldn't have broken just like that.

Alfredo Barrios 

*If you plan to install a CPU that utilizes more then 130W,  HP recommends that you install the liquid cool heatsink assembly.*

Xeon 8C E5-2687W V2 3.4Ghz 25MB 8GTs 150W Processors | 4.0Ghz Max Turbo Frequency (SR19V)

Gorilla Warfare 

I appreciate the response. I currently am already running a liquid cooled heatsink with the E5-1620 v2.

Alfredo Barrios Then go with the upgrade you listed. It's the best choice for your needs.

Alfredo Barrios Welcome to the Forum. I have found it helpful. I am running an Intel Xeon E5-2760 8 core CPU on my HP Z420v2 workstation. The stock HP liquid cooled heatsink is expensive and not as efficient as other after-market AIO liquid cooled systems. I am using the CoolerMaster AIO liquid cooled system, which has a 240mm radiator. I have installed 4 120mm fans in a push/pull arrangement. The radiator is positioned next to the front panel of the computer. I typically get temperature readings in the 65 to 75 degrees F range even under load. I replaced the stock cover of the workstation with a 1/8th inch clear Acrylic panel, which has two 120mm quiet-cool exhaust fans. They take warm air coming off the radiator and areas around the CPU and vent the air to the outside. The Acrylic panel is fastened with tiny magnets super-glued around the edge of the panel. The system has 64GB RAM and an EVGA GTX 1080ti graphics card. It gets truly impressive benchmarks all around.  

Gorilla Warfare Yes, It's MSI

Catwoman531 MSI GeForce GTX 1050 Ti DirectX 12 GTX 1050 Ti GAMING X 4G 4GB 128-Bit GDDR5 PCI Express 3.0 x16 HDCP Ready ATX Video Card

Jackson Wareing Most Xeon based systems (from either Dell or HP) do not support SLI unless it's on specific Quadro cards or using sketchy hacked drivers. I did however checked HP's support forums and the answer is no.

https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/SLI-HP-Z420/m-p/8076014