Memory for server

Posted on 2014-08-07
Last Modified: 2014-08-08
We have a Dell server (R410) running vSphere ESXi that has the following memory installed:
8GB 1Rx4 PC3L - 12800R (total 48GB)

We purchased 4 more DIMMs, but when they arrived, it says: 8GB 2Rx4 PC3L - 12800R.

I installed the additional memory and everything seems to be working OK. Can you explain the difference between 1Rx4 and 2Rx4, and if the two can be installed on the same server?

Also, is there a performance degradation?
Question by:pzozulka
    LVL 34

    Accepted Solution

    the 1x and 2x refer to single and dual rank, respectively
    this should answer your questions

    Singe Rank Memory vs. Dual Rank Memory

    as far as performance goes, the speed is probably reduced to 1066MHz though you probably won't notice much of any difference.  it's not a dell thing, it's how the intel chipset was designed.

    some additional reference material

    PowerEdge R410 Technical Guide
    LVL 8

    Author Comment

    Why would you say it's reduced to 1066MHz?
    LVL 34

    Expert Comment

    by:Seth Simmons
    it's the design of the chipset
    if there were only a couple modules that were 1600 then it would run at 1600
    but when you start populating more slots, the speed is reduced
    if it was fully populated it would slow to 800

    i had a number of R710's with all 18 modules populated with 8gb 1333 modules (total 144gb) but the speed was reduced to 800

    the chipset used in the 12g servers (R420, R720, etc.) don't have that limitation
    LVL 8

    Author Comment

    Oh I see, so the speed limitation has nothing to do with the memory mismatch -- that was my main concern.

    Also, seems like in the article you posted, it's not a bad thing to have dual rank mixed with single rank, and in fact recommended when you have a lot of memory installed. We have 80GB now after the latest upgrade.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Top 6 Sources for Identifying Threat Actor TTPs

    Understanding your enemy is essential. These six sources will help you identify the most popular threat actor tactics, techniques, and procedures (TTPs).

    In this article we have discussed the manual scenarios to recover data from Windows 10 through some backup and recovery tools which are offered by it.
    I use more than 1 computer in my office for various reasons. Multiple keyboards and mice take up more than just extra space, they make working a little more complicated. Using one mouse and keyboard for all of my computers makes life easier. This co…
    Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…
    Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

    759 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