New 16GB RAM only 3.9 GB usable

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  1. bobkn
    Posts : 4,439
    Win 11 Pro 22000.652
       New #11

    The Asus specs on your motherboard: SABERTOOTH 990FX R2.0 | Motherboards | ASUS Global

    states that the board supports maximum RAM of 32 GB ( 4 X 8 GB). It looks like it may not accept a 16 GB DIMM.

    If you want to be conservative, only use RAM from the QVL (qualified vendors list):

    SABERTOOTH 990FX R2.0 Memory / Device Support | Motherboards | ASUS Global

    No DIMMs larger than 8GB are shown there. (There are some 2 X 8 and 4 X 8 sets.)

    As an independent check, you can see what Crucial offers: RAM & SSD Upgrades | ASUS SABERTOOTH 990FX R2.0 | Crucial.com

    Sorry about that.
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  3. logan123
    Posts : 5
    Microsoft Windows 10 Pro 64-bit 18362 Multiprocessor Free
    Thread Starter
       New #12

    Microsoft Windows [Version 10.0.18362.418]
    (c) 2019 Microsoft Corporation. All rights reserved.

    C:\Users\Its Me>wmic memorychip get manufacturer, capacity, partnumber, speed, memorytype, devicelocator, formfactor
    Capacity DeviceLocator FormFactor Manufacturer MemoryType PartNumber Speed
    4294967296 DIMM0 8 Kingston 24 KHX1600C9D3/4GX 1333
    4294967296 DIMM1 8 Kingston 24 KHX1600C9D3/4GX 1333
    4294967296 DIMM2 8 Kingston 24 KHX1600C9D3/4GX 1333
    4294967296 DIMM3 8 Kingston 24 KHX1600C9D3/4GX 1333

    - - - Updated - - -

    bobkn said:
    The Asus specs on your motherboard: SABERTOOTH 990FX R2.0 | Motherboards | ASUS Global

    states that the board supports maximum RAM of 32 GB ( 4 X 8 GB). It looks like it may not accept a 16 GB DIMM.

    If you want to be conservative, only use RAM from the QVL (qualified vendors list):

    SABERTOOTH 990FX R2.0 Memory / Device Support | Motherboards | ASUS Global

    No DIMMs larger than 8GB are shown there. (There are some 2 X 8 and 4 X 8 sets.)

    As an independent check, you can see what Crucial offers: RAM & SSD Upgrades | ASUS SABERTOOTH 990FX R2.0 | Crucial.com

    Sorry about that.
    Thanks for this. I will go out soon and get RAM from the QVL and get back to you guys. It might be a few days, but I will still be looking at this thread.
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  4. bro67
    Posts : 8,633
    Mac OS Catalina
       New #13

    11 replies and all the OP needed to do was look at page 24 to 35 in https://dlcdnets.asus.com/pub/ASUS/m...R20_V2_WEB.pdf. Also RAM & SSD Upgrades | ASUS SABERTOOTH 990FX R2.0 | Crucial.com. The fact that you need two 8gb modules or 4 4gb to be able to OC.
    Last edited by bro67; 31 Oct 2019 at 10:44.
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  6. Berton
    Posts : 12,429
    Win10 Version 21H2 Pro and Home, Win11 Pro
       New #14

    Just to add, crucial.com shows 8GB in each slot for a maximum of 32GB.
    Crucial 8GB DDR3L-1600 UDIMM

    https://www.crucial.com/usa/en/compatible-upgrade-for/ASUS/sabertooth-990fx-gen3-r2*0
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  7. logan123
    Posts : 5
    Microsoft Windows 10 Pro 64-bit 18362 Multiprocessor Free
    Thread Starter
       New #15

    Problem,fixed. We installed ddr3s and now I have 12gb of ram. Plenty to play Modern Warfare
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  8. zbook
    Posts : 39,963
    windows 10 professional version 1607 build 14393.969 64 bit
       New #16

    To see the changes:

    Open administrative command prompt and copy and paste:

    wmic memorychip get manufacturer, capacity, partnumber, speed, memorytype, devicelocator, formfactor


    When this has completed > right click on the top bar or title bar of the administrative command prompt box > left click on edit then select all > right click on the top bar again > left click on edit then copy > paste into the thread



    These were the DDR3 before the changes:

    Capacity DeviceLocator FormFactor Manufacturer MemoryType PartNumber Speed
    4294967296 DIMM0 8 Kingston 24 KHX1600C9D3/4GX 1333
    4294967296 DIMM1 8 Kingston 24 KHX1600C9D3/4GX 1333
    4294967296 DIMM2 8 Kingston 24 KHX1600C9D3/4GX 1333
    4294967296 DIMM3 8 Kingston 24 KHX1600C9D3/4GX 1333
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