Solved

Mixing RAM densities in a Dell server?

Posted on 2014-12-17
7
228 Views
Last Modified: 2016-11-23
We have a Dell PowerEdge gen 12 server that is capable of a total 384 GB of RAM and has 12 RAM slots total.  Currently, we have a total of 32 GB of RAM occupying 4 slots at 8 GB each.

I would like to upgrade this server at some point in the future using higher density RAM of the same specifications as RAM prices go down, making maximum use of the slots available.  But I would like to of course continue to be able to use the existing ones.

My question is, can I mix RAM density types if all other specs and brand are exactly the same?  My guess is yes, but just wanted to double check.  Also, I am guessing that they will need to be paired in some sort of slot staggered order?

Thanks.
0
Comment
Question by:CnicNV
7 Comments
 
LVL 37

Expert Comment

by:Neil Russell
ID: 40505534
Unlikely if it is a newer server.  Please specify exactly what server you have as they will specify exactly what memory configurations are available for that model based on what processor configuration you have.
0
 
LVL 34

Expert Comment

by:Seth Simmons
ID: 40505692
sure, you can add 16gb modules if you wanted, but no more than 2 different sizes
for number of modules, depends if you have 1 or 2 processors
you can add a 16gb module if you have one processor but have to put 2 modules if you have 2 processors (1 in each channel)

if you have 2 processors, you can add 8 16gb modules giving you an additional 128gb
of course, how much of that you can use is dependent on the operating system
0
 
LVL 55

Expert Comment

by:andyalder
ID: 40505694
Just about every new Intel or AMD based server lets you mix capacities and even speeds and number of ranks, the only hard and fast rule is you can't mix RDIMMs with UDIMMs or LRDIMMs. Population rules vary slightly and it's a fraction faster having the same amount of RAM on each memory channel, you've probably got 3 or 4 channels per CPU. Try to ensure the same of amount of RAM on each CPU.

384GB suggests 12 * 32GB dual rank DIMMs max, if you confirm the machine you have someone will recommend what to put in which slot.
0
NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

 
LVL 55

Expert Comment

by:andyalder
ID: 40505720
Silly me, that would be 12 * 32GB quad rank at 2DPC, there aren't 32GB dual rank although 32GB load reduced DIMMs look like 2 ranks to the CPU.
0
 

Author Comment

by:CnicNV
ID: 40532129
Sorry for the delay, holidays/their lead up and all that.

This server is a 12th generation Dell Poweredge r420 with 4 8GB RDIMM chips at 1600mhz.  So I am gathering from most of the feedback that as longs as I buy RAM that is of a "Dell supported" brand in the 1600mhz RDIMM configuration, mixing any densities up to 32 GB should be fine?
0
 
LVL 55

Accepted Solution

by:
andyalder earned 500 total points
ID: 40532692
Yes although there's no requirement to match the speed of the current ones, but if you put slower ones in then all the RAM will run at the slower speed.
0
 

Author Closing Comment

by:CnicNV
ID: 40533998
Ok perfect.  Thanks for the help :)
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How to Retrieve Motherboard Details 10 85
Hardware RAID vs OS RAID 20 121
Group Policy Object - Mapping DrivesI'v 5 51
RAID, not sure what Type ?? 14 123
Patch Management is administrated by page 129 of  the following document:     http://support.dell.com/support/edocs/software/smdmc/11/en/ug/ug.pdf However, there are issues with Patch Management with FTP (for instance, a slow Internet connectio…
INTRODUCTION The purpose of this document is to demonstrate the Installation and configuration, of the HP EVA 4400 SAN Storage. The name , IP and the WWN ID’s used here are not the real ones. ABOUT THE STORAGE For most of you reading this, you …
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
This video shows how to remove a single email address from the Outlook 2010 Auto Suggestion memory. NOTE: For Outlook 2016 and 2013 perform the exact same steps. Open a new email: Click the New email button in Outlook. Start typing the address: …

932 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now