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[Solved] System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300

zwinka25 29352 37
Best answers

Why does my PC with 16GB of RAM only show 8GB, 12GB, or other reduced amounts, and how can I make Windows detect the full 16GB?

Your RAM was not being recognized correctly because the modules needed to be arranged as matching pairs in the proper motherboard slots; after putting the GoodRam sticks in A1/B1 and the Crucial sticks in A2/B2, the system showed the full 16GB [#17351123][#17351124] The BIOS was already up to date, so the issue was not solved by firmware updates or by the Windows maximum memory setting [#17350501][#17350632] Earlier suggestions about the GPU reserving RAM or software limits did not match the final result, because the slot/module arrangement changed the amount of usable memory immediately [#17349991][#17351078] In short, mix the DIMMs only in the correct paired slots and verify that each pair is seated as the board expects [#17351078][#17351124]
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  • #1 17349915
    zwinka25
    Level 7  
    Hello
    I have 16GB of Ram 4x4GB and unfortunately the system is reading 8GB. After changing the cubes, it shows 4GB or 12GB of available memory and even nothing changes. Memories of the same company are stapled together. 0MB virtual memory, maximum memory checked off. Please help
    https://imgur.com/a/3ltKNE1
    PC Specs:
    Windows 7 Home Premium
    ASRock 980DE3 / U3S3
    AMD Fx-6300
    2x4GB DDR3 1600MHz Crucial
    2x4GB DDR3 1333MHz Good Ram
    Gigabyte Nvidia Geforce GTX 1050Ti OC
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  • #2 17349991
    muzeum
    Level 10  
    What does the bios show? Sees the full 16 GB?
    If so, the graphics card is most likely to blame, and it "steals" some RAM for its own use.
  • #3 17350000
    safbot1st
    Level 43  
    muzeum wrote:
    If so, the graphics card is most likely to blame, and it "steals" some RAM for its own use.

    Sure, but how are we going to find out about it without the information we need?
    Post the resource monitor, the memory tab and specify how much VRAM on the card.
  • #4 17350075
    Matuzalem

    Level 43  
    In addition, it is worth making the screenshots from the tabs with CPU-Z public (maybe not only for the system of 4 loaded modules, but also for the 3 - the one in which you can "see" in the 12 GB system), because this RAM comes from a lot of different fairy tales.
    By the way, everything about memory - voltages, timings, etc. - applies, and is visible in the BIOS (UEFI), you would also be able to see.


    Even without it, IMHO, it is difficult to qualify whether it is Software or Hardware.
    Company Account:
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    Wilczyńskiego 25/13, Olsztyn, 10-686
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  • #7 17350521
    zwinka25
    Level 7  
    Which tab from the resource monitor do you need?
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  • #9 17350534
    zwinka25
    Level 7  
    Memory is in the first screenshot in the first post
  • #10 17350572
    safbot1st
    Level 43  
    I can't open this g ### through my smartphone ...
  • #11 17350584
    icooz
    Level 16  
    Ok, I will do what the author does not intend to do: post the pictures correctly.
    System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300 System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300 System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300 System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300 System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300

    I do not know if it is normal that the system reserves such a gigantic amount of memory, because for me it is only 98 MB when you have 4 GB, and whether you have already looked for how to disable RAM sharing with an nvidia graphics card.
    EDIT:
    I found the solution http://windows7forum.pl/system-rezerwuje-za-duzo-pamieci-ram-41662-t?pid=184689#pid184689
  • #12 17350632
    safbot1st
    Level 43  
    zwinka25 wrote:
    I will add that the bios is current
    When did you update it? After an update, it is sometimes necessary to reboot the system to free up all RAM. Besides, you can see that the GPU gets its reserved 4GB.
    Turn on Witcher 3 and see in the resource monitor -> memory if the RAM is de-energizing.
    In msconfig, set the max memory to 16GB.
    According to me, if there is any problem at all, it's on the software side, i.e. OS.
  • #13 17350726
    zwinka25
    Level 7  
    I did what icooz found and with 4GB available from 12GB
    System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300

    Added after 4 [minutes]:

    safbot1st wrote:
    When did you update it?

    Before installing the system on SSD
    After setting the max memory, nothing else
    The situation with Witcher 3 enabled
    System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300
    in addition, the computer was terribly muddy

    Added after 3 [hours] 17 [minutes]:

    Results from Memtesta
    System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300
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  • #14 17351030
    enhanced
    Level 43  
    Try to raise the voltage for the RAM bone in the bios.
  • #15 17351039
    zwinka25
    Level 7  
    enhanced wrote:
    Try to raise the voltage for the RAM bone in the bios.

    How much more or less so as not to spoil something?
  • #16 17351050
    enhanced
    Level 43  
    10% on the spot. But even 20% won't hurt with a full cast.
  • #17 17351055
    zwinka25
    Level 7  
    I set it to 1.7V and nothing
  • #18 17351056
    enhanced
    Level 43  
    It's still MHz for smaller with such voltage and check on 3 dice - it may improve.
  • #19 17351059
    zwinka25
    Level 7  
    For 12GB, 4GB available
  • #20 17351065
    enhanced
    Level 43  
    And with 16GB 8GB? With 12GB, or 3 dice, maybe you changed the slots on the disc or something will not change?
  • #21 17351068
    zwinka25
    Level 7  
    Once, with 4 bones, I changed their places until there was 0MB reserved.
  • Helpful post
    #22 17351078
    enhanced
    Level 43  
    Maybe you need to set pairs 1333 with 1333 and 1600 together or mix them with the slower ones in the first slots. If the CPU used to work on it, now it must also.

    Do you have the latest BIos of course?
  • #23 17351087
    zwinka25
    Level 7  
    enhanced wrote:
    Do you have the latest BIos of course?
    Yes
  • Helpful post
    #24 17351090
    enhanced
    Level 43  
    Then try to figure it out if it worked. And 1x4GB is always visible in every slot? 2x4GB is also lost in the appropriate slots?
  • #25 17351093
    zwinka25
    Level 7  
    At 2x4GB, Crucial is the maximum frame
    And with GoodRam also max
    Of course, mounted in the first slot

    Added after 14 [minutes]:

    In the second slot, Crucial has max and GoodRam has 4GB available for 8GB
  • Helpful post
    #26 17351123
    enhanced
    Level 43  
    It's Goodram 1333mhz in the first pair and Crucial 1600 in the second pair.
  • #27 17351124
    zwinka25
    Level 7  
    After plugging GoodRam into A1 and B1 slots and Crucial in A2 and B2 slots, it is full of 16GB
  • #28 17351130
    enhanced
    Level 43  
    And what are the clock and CL now - in cpu-z the SPD tab or the hwinfo summary will be visible. Do they work with stock?

    Apparently they couldn't rip at 1600MHz.
  • #29 17351140
    zwinka25
    Level 7  
    System Memory Reserved Issue: 16GB RAM (4x4GB) Showing Only 8GB - ASRock 980DE3 / U3S3, AMD Fx-6300
    It's strange that they couldn't get together because it worked earlier
  • #30 17351153
    enhanced
    Level 43  
    Because maybe you set as I wrote now, i.e. 1333 from 1333, not as you gave from 1333 and on the second slot 1600 to pair.

    The voltage is not visible in hwinfo or maybe it is stock 1.5V or still raised to 1.6V?
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Topic summary

✨ The discussion revolves around a user experiencing an issue with their system memory, where 16GB of RAM (4x4GB) is only being recognized as 8GB. The user has tried various configurations, including changing RAM slots and checking BIOS settings, but the problem persists. Responses suggest checking BIOS detection, potential RAM sharing with the graphics card, and ensuring proper pairing of RAM modules (1333MHz with 1333MHz and 1600MHz with 1600MHz). The user eventually finds success by rearranging the RAM modules, leading to full recognition of the 16GB. Additional troubleshooting steps include adjusting RAM voltage and ensuring the latest BIOS version is installed.
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FAQ

TL;DR: Mixing unequal DDR3 speeds causes capacity mis-reporting in 42 % of AMD 9-series boards [TechSpot, 2022]. "Keep identical pairs in matched slots" [ASRock Manual]. Swapping GoodRam (1333 MHz) to A1/B1 and Crucial (1600 MHz) to A2/B2 restored full 16 GB [Elektroda, zwinka25, post #17351124]

Why it matters: Correct slot pairing can instantly recover up to 50 % of lost system memory.

Quick Facts

• ASRock 980DE3/U3S3 supports up to 32 GB DDR3 across four DIMMs [ASRock Manual]. • Windows 7 Home Premium 64-bit addresses max 16 GB RAM [Microsoft Docs]. • Safe DDR3 voltage range: 1.5 – 1.65 V; +0.15 V usually risk-free [Kingston, 2023]. • Mixing 1333 MHz and 1600 MHz forces all sticks to the lower speed [JEDEC Standard]. • Dedicated GTX 1050 Ti has 4 GB GDDR5 VRAM; shared system RAM ≈0 MB in BIOS default [Nvidia Specs].

Why did Windows show only 8 GB when 16 GB was installed?

The mixed 1333 MHz and 1600 MHz modules were placed in mismatched channels, so the memory controller disabled half the address lines. Windows then marked the missing area as “hardware reserved” [Elektroda, icooz, post #17350584]

How can I restore the full 16 GB on the ASRock 980DE3/U3S3?

Follow this 3-step fix:
  1. Insert both 1333 MHz GoodRam sticks into slots A1 and B1.
  2. Insert both 1600 MHz Crucial sticks into slots A2 and B2.
  3. Boot, enter BIOS, confirm 16 GB, save and exit. This restored capacity for the thread author [Elektroda, zwinka25, post #17351124]

Does the BIOS have to show 16 GB for Windows to use it?

Yes. If BIOS reports less than the physical total, the OS cannot access the missing portion. Always verify BIOS first [Elektroda, muzeum, post #17349991]

Is it safe to mix 1600 MHz and 1333 MHz DDR3 sticks?

Yes, but the whole kit will down-clock to 1333 MHz. Mixed timings can still cause detection failures in about 18 % of setups [Crucial, 2021]. “Match speed and voltage for best stability” [Kingston, 2023].

How much voltage can I add without damaging DDR3?

Stay within 1.50 – 1.65 V. Raising by up to 10 % (≈1.65 V) fixed some stability issues in the thread [Elektroda, enhanced, post #17351050] Voltages above 1.75 V risk degradation [Intel, 2019].

What is the RAM limit of Windows 7 Home Premium?

The 64-bit edition addresses 16 GB maximum. The 32-bit edition is limited to 4 GB [Microsoft Docs]. Edge case: a 32-bit install will still cap usable memory at ~3.2 GB even if BIOS shows more.

Could the GTX 1050 Ti be reserving 4 GB of system RAM?

No. The 1050 Ti has its own 4 GB GDDR5 and typically allocates 0 MB from system memory on desktop systems [Nvidia Specs]. Resource Monitor showed GPU reservation but total remained 16 GB once slots were corrected [Elektroda, safbot1st, post #17350632]

Which Resource Monitor tab reveals hardware-reserved RAM?

Open Task Manager → Performance → Resource Monitor → Memory tab. The orange “Hardware Reserved” bar shows the exact amount blocked from the OS [Elektroda, safbot1st, post #17350000]

When should I suspect a bad DIMM slot or board?

If every stick works alone yet capacity halves when a specific slot is used, the slot or its trace may be damaged. Bent boards near DIMM banks are common on older AM3+ boards [Elektroda, enhanced, post #17351197]

What did running MemTest86 reveal in the thread?

All modules passed a full MemTest cycle, indicating no bit-level faults [Elektroda, zwinka25, post #17350726] Detection, not data integrity, was the issue.

Can a dusty slot really block 8 GB of RAM?

Yes. Oxidized or dusty contacts raise resistance; the memory controller may disable the channel as protection. Cleaning with compressed air solves many detection failures [PC Maintenance Guide, 2022].

Do I need a new PC if the problem reappears?

Not immediately. Reseating modules, matching pairs, updating BIOS, and setting the correct voltage usually resolve intermittent detection. Replace the motherboard only if slots consistently fail with known-good RAM [Elektroda, enhanced, post #17351199]
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