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maximum memory on Optiplex 390


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maximum memory on Optiplex 390

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According to the spec sheets, the maximum memory you can install into an Optiplex 390 is 8 GB. Can anyone tell me why that is? I thought the chipset in this computer would support 2 x 8 GB dimms? Is that just old information, or is there really a 2 x 4GB maximum? Why would that be?


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  • Hi Enigmothy,

    Both Crucial and the spec sheet for the Opti 390 say 8GB (2x4GB). Of course, you're welcome to try 2x8GB and let us know if it works.

  • Updating this thread to confirm that the Optiplex 390 does indeed support 16GB (2 x 8GB DIMMS) of memory.

    The memory in question is G.Skill DDR3-1600 PC3-12800 8192MB x2 (F3-1600C11D-16GNT) set.


  • Hi could you tell me if that RAM upgrade to 16gb is available in any 2x8gb RAM chip formations of the same spec i.e. DDR3-1600 PC3-12800. Meaning like from some other manufacturers like Crucial or Kingston etc?

  • Crucial Says

    • Maximum memory: 8192MB
    • Slots:2 (2 banks of 1)


    • DDR3 PC3-12800 • 9-9-9-24 • Unbuffered • NON-ECC • DDR3-1600 • 1.35V • 512Meg x 64 • Low Profile •

    Another user says that this works HOWEVER I do not know this.


    G.SKILL Value 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-1600C11D-16GNT

    • DDR3 1600 (PC3 12800)
    • Timing 11-11-11-28
    • Cas Latency 11
    • Voltage 1.5V


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  • Hi I would like to update this thread for the sake of helping others. I recently installed 16gb (2x8gb sticks) of RAM in my Dell Optiplex 390 Desktop and it seems to accepting the full 16gb. I checked both the BIOS and Windows specifications page and it says that the full 16gb is in use.

    The RAM modules I purchased where

    Crucial Balistix Tactical LP 16gb (2x8gb) - Ballistix Tactical BLT2C8G3D1608ET3LX0CEU 16GB kit (8GB x 2) DDR3 PC3-12800 Unbuffered NON-ECC 1.35V.

    The memory speed has been slowed down to 1333mhz by the motherboard I think and I have no way of changing the XMP profile to run it at 1600mhz due to the limitations of the board. I can confirm however that in 1333mhz mode my computer is running really fast and I can't complain whatsoever really. My computer has the Core i5 2400 processor in it and the stock 250gb HDD just to clarify.  

  • can i add to this del a gtx graphic card?

  • hi all

    I got bios A11  on my optiplex 390 and  I need memory upgrade  right now i got 8GB  2x4GB

    i saw  ram modules like this

    will they work at  optiplex 390 as 16 gb  ?