This site is currently read-only as we are migrating to Oracle Forums for an improved community experience. You will not be able to initiate activity until January 30th, when you will be able to use this site as normal.

    Forum Stats

  • 3,890,260 Users
  • 2,269,776 Discussions


RDIMM question

4063717 Member Posts: 27
edited Dec 5, 2019 8:46PM in Oracle x86 Servers

Hello everyone.

so my question is this...

I have an X4270 M1 and am having some ram issues. this may be my own fault, but here goes.

The manual does not say anything about 1 or 2R x 8 RAM sticks not working in my server, but when it talks about RAM for my server, the examples are 1Rx4 and 2Rx4 and 4Rx4 (single, dual and quad rank x 4 bit)

i have 6 x 2GB 1Rx4 PC3 x 8500R stick that work and post fine.

when i remove them and replace (for testing purposes) them with 6 x 2GB 2Rx8 PC3 -10600R, it posts sometimes with a less than total Memory count.

the server can use the PC3 -10600R RAM according to the manual, but i think it does not like the x8 sticks.

I have a yellow fault light. when i unplug and open the server and push the fault button, all the leds light up for all the locations that have sticks in there.

the server will boot and run with the 8 bit RAM, but still has a fault light.

i'm looking to buy more RAM, but do not want to buy 8 bit if it's not going to work.

so my question is 'does anybody have experience with or can guarantee 2Rx8 RAM should not be used?'

the manual says board max is 144Gb ram. With 18 slots, thats 8GB per slot. i'm looking to get to 48GB. so, 3 x 8GB per CPU or 6 x 4GB.

(just found that the RAM i bought for my Dell R710 is 2Rx4, i will have to bring it down to test this server)



  • Nik
    Nik Blocked Member Posts: 2,879 Bronze Crown
    edited Nov 29, 2019 3:03AM


    1.  In case server lit fault led - You can login to ILOM and read all logs/ events for troubleshoot problem.

    2.  You can check Handbook ( ) for got list of supported components.

    Any other components can work or not, but noboby can give any garantee.

    I can see next types of DIMM:

       -  2 GB    1-Rank/1Gbit SDRAM (DDR3-1066/PC3-8500 DDR3-1333/PC310600)

       -  4 GB    2-Rank/1Gbit SDRAM (DDR3-1066/PC3-8500 DDR3-1333/PC310600)

       -  8 GB    2-Rank/2Gbit SDRAM ( DDR3-1066/PC3-8500 )



  • 4063717
    4063717 Member Posts: 27
    edited Nov 29, 2019 10:04AM

    ok, thanks Nik.

    searching the Sun part numbers on the web, i found that all the RAM are 1 or 2 rank x 4. so i am going to assume that only X4 RAM is compatible.

    i'll sell off my x8 Sticks and buy some x4 sticks.

  • ClaudiuO-Oracle
    ClaudiuO-Oracle Principal Technical Support Engineer Member Posts: 50 Employee
    edited Dec 2, 2019 10:33AM

    Hello 4063717,

    Nik is right, if the server does not have a valid support contract and you are not thinking of renewing it then the you can try to purchase DIMM's from untrusted sources, otherwise the recommended way is to purchase them trough Oracle as they will be certified to be installed on this machine.

    The supported DIMM's are:




    1-Rank/1Gbit SDRAM

    1.5V VDD/VDDQ

    2GB Registered DIMM




    2-Rank/1Gbit SDRAM

    1.5V VDD/VDDQ

    4GB Registered DIMM



    2-Rank/2Gbit SDRAM

    1.5V VDD/VDDQ

    8GB Registered DIMM



    1-Rank/1Gbit SDRAM

    1.5V VDD/VDDQ

    2GB Registered DIMM



    2-Rank/1Gbit SDRAM

    1.5V VDD/VDDQ

    4GB Registered DIMM

    Also you must follow the following guidelines:

    1. DIMM speed is limited by the CPU QuickPath Interconnect (QPI) speed.
    2. Install memory filler panel 350-1288 in all unused slots.
    3. Install the first three DIMMs in CPU0 and CPU1 slots D8, D5, and D2.
    4. Install the second three DIMMs in CPU0 and CPU1 slots D7, D4, and D1.
    5. Install the last three DIMMs in CPU0 and CPU1 slots D6, D3, and D0.
    6. Use of the same DIMM size and speed is recommended for maximum performance.

    Bet regards,

  • 4063717
    4063717 Member Posts: 27
    edited Dec 5, 2019 8:46PM

    As this is a home lab without a service contract, no need to overpay for SUN RAM.

    any X4 RDIMM will work fine as long as it matches the specs as per the service manual. took 6 x 4GB 2Rx4 PC3 -10600R out of my Dell R710 server and moved it into my X4270. works perfectly.

    will buy 6 more to top it out at 48GB, enough for this server, and put the 6 x 2GB 2Rx8 PC3-10600R RAM away for future server purchases.

    Thanks for your help.

    anyone want to buy 6x 2GB 1Rx4 PC3-8500R? SUN PN: 371-4282-01

    don't want to slow the server down by downgrading the other RAM.