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[Solved] Second RAM Slot Not Working: 16GB DDR3 Kingston RAM Issue (2x8GB) - Troubleshooting Tips

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  • #1 17093483
    Arabsky
    Level 7  
    Posts: 8
    Rate: 5
    Hello.
    I have a problem with the ram slot.
    I used 16GB DDR3 RAM on 2 slots all the time, recently I noticed that it only displays 8GB to me, I decided to check what the problem was, both frame bones worked, and the other slot does not read my bones.
    RAM DDR3 2x8 from Kingston.
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  • #2 17093584
    JacekCz
    Level 42  
    Posts: 8670
    Help: 760
    Rate: 1460
    I don't see the question.
    But as I ask you. Of course, you don't recall any events contributing to failure? Is it broken just by looking?
    What record
  • #3 17093914
    Arabsky
    Level 7  
    Posts: 8
    Rate: 5
    It broke by itself, the plate under phenoma x4 740
  • #4 17094017
    Mac!
    Level 18  
    Posts: 650
    Help: 19
    Rate: 27
    Test both cubes in one slot. Later plant two, swapping places.
    If something went wrong then you can spr. reset the bios with the jumper before saving sensitive settings in the bios e.g. on a sheet of ...
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  • #5 17094223
    Arabsky
    Level 7  
    Posts: 8
    Rate: 5
    I swapped the bones and both bones worked only in this first slot, the second slot cannot be read by me.
    I do not quite understand what you meant "reset the bios" but I took out the battery what is on the motherboard and still did not work
  • #6 17094313
    310artur
    Level 43  
    Posts: 9002
    Help: 980
    Rate: 670
    The problem may be in the disc or in the CPU. It won't go lightly to diagnose. First of all the magnifier and look carefully at the RAM slot itself which does not work. It is almost impossible for something to happen to the inserted bone, but it would be the best ;) You can try to remove and reinstall the CPU later (you will need to change the paste here). As well as that, it will not help to test the CPU on another board with 2 RAM bones or your set with a different CPU.
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  • #7 17094338
    Arabsky
    Level 7  
    Posts: 8
    Rate: 5
    The slot itself has stopped working. I cleaned it with a brush and nothing, I replaced Paste about 3 days ago. Today I have embedded the CPU again and nothing else. : /

    Added after 3 [minutes]:

    310artur wrote:
    The problem may be in the disc or in the CPU. It won't go lightly to diagnose. First of all the magnifier and look carefully at the RAM slot itself which does not work. It is almost impossible for something to happen to the inserted bone, but it would be the best ;) You can try to remove and reinstall the CPU later (you will need to change the paste here). As well as that, it will not help to test the CPU on another board with 2 RAM bones or your set with a different CPU.


    Do you think it could be a cpu fault?
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  • #8 17094396
    310artur
    Level 43  
    Posts: 9002
    Help: 980
    Rate: 670
    In theory, the RAM controller is in the CPU and can fall. In practice, however, something much more often falls on the disc. Only that there is no certainty and blindly buy something, it is better to give to the service for diagnosis. It pays off - if you buy what you need, you are backwards because the diagnosis does not cost much.
  • #9 17094407
    Arabsky
    Level 7  
    Posts: 8
    Rate: 5
    It's also strange that one slot doesn't work by itself, I haven't pulled the dice in half a year
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    #10 17094421
    310artur
    Level 43  
    Posts: 9002
    Help: 980
    Rate: 670
    That's why it's hard to say what could happen. In my opinion, what you could have done. It can not be repaired at all except by exchanging what has fallen.
  • #12 17094468
    310artur
    Level 43  
    Posts: 9002
    Help: 980
    Rate: 670
    And let the problem actually be in the CPU-board or RAM-board contacts :)
    It remains to wait and count that it will be OK.

    This is the case with RAM - in intel (newer than LGA775) you see such RAM you have to check the socket - AMD you have to "count" the CPU feet.
    It is strange that it stopped working by itself - it cannot be ruled out that something on the board is not touching and the problem has disappeared because something "touched". It remains to hope that it will stay that way for longer (whatever that is)
  • #13 17094472
    Arabsky
    Level 7  
    Posts: 8
    Rate: 5
    The problem lay in the pins on the CPU, I noticed that one pin was slightly skewed, I decided to straighten it and the problem was solved.
    Thank you all for the advice
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Topic summary

✨ The discussion revolves around a user experiencing issues with a second RAM slot not recognizing a 16GB DDR3 Kingston RAM configuration (2x8GB). Initial troubleshooting steps included testing the RAM sticks individually in different slots, confirming that both sticks functioned in the first slot but not in the second. Suggestions included checking the RAM slot for physical damage, resetting the BIOS, and examining the CPU for potential faults. Ultimately, the problem was identified as a bent pin on the CPU, which, when straightened, resolved the issue and allowed the system to recognize the full 16GB of RAM.
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FAQ

TL;DR: If 16GB (2x8GB) shows as only 8GB, suspect a channel/slot issue; "the RAM controller is in the CPU." Reseat the CPU, check pins, and clear CMOS. This FAQ helps DDR3 desktop users fix a non-detecting second RAM slot. [Elektroda, 310artur, post #17094396]

Why it matters: A dead channel halves usable memory and can destabilize apps, games, and VMs.

Quick Facts

Why does only 8GB of my 16GB DDR3 show up?

One memory channel or slot failed to initialize. On AMD platforms, the memory controller sits on the CPU package. Bent pins, poor seating, or board faults can cause this. Swap modules and slots to isolate the path. Clear CMOS to retrain memory settings. [Elektroda, 310artur, post #17094396]

How do I quickly isolate the bad slot, stick, or channel?

Do a minimal swap test:
  1. Test each DIMM in Slot A by itself until it POSTs.
  2. Move the same DIMM(s) to Slot B and note any missing RAM.
  3. Install two DIMMs and swap positions; compare detection patterns. [Elektroda, Mac!, post #17094017]

Could the CPU be at fault when the second RAM slot fails?

Yes. On AMD Phenom/Athlon-era systems, "the RAM controller is in the CPU." A bent or misaligned pin can break one channel. Test with another CPU or board when possible. If the IMC channel dies, only CPU replacement resolves it. [Elektroda, 310artur, post #17094396]

What fixed it for the original poster here?

A single bent CPU pin was gently straightened. After reseating the CPU and clearing settings, both slots detected 16GB again. This points to contact integrity between CPU and socket as the root cause. [Elektroda, Arabsky, post #17094472]

How do I safely check and reseat the CPU?

Shut down, unplug power, and discharge by holding the power button. Remove the cooler and lift the CPU. Inspect the CPU pins and the socket using a magnifier and strong light. Reinstall the CPU carefully and reapply fresh thermal paste before mounting the cooler. [Elektroda, 310artur, post #17094313]

How do I clear CMOS properly?

Use the board’s procedure:
  1. With power unplugged, move the CLR_CMOS jumper to the clear position for 10–20 seconds.
  2. Move it back, reconnect power, and boot.
  3. Alternatively, remove the battery briefly, then restore BIOS settings. [Elektroda, Mac!, post #17094017]

Is the motherboard more likely bad than the CPU here?

Board faults are more common than CPU IMC failures, but there’s no certainty without testing. Avoid buying parts blindly. As one expert noted, “It pays off” to get a diagnosis first. [Elektroda, 310artur, post #17094396]

What if both sticks work in Slot A but not in Slot B?

That pattern indicates the Slot B path or its channel isn’t making contact. On AMD, inspect CPU pins carefully. In this thread, one bent pin caused the second slot to fail detection. [Elektroda, Arabsky, post #17094472]

Can dust or oxidation in the DIMM slot cause missing RAM?

Yes. Debris or oxidation can block contacts and prevent initialization. Blow out the slot with dry compressed air and inspect under magnification. Do not scrape the contacts. Reseat the module firmly until both latches click. [Elektroda, 310artur, post #17094313]

Will a BIOS update help detect both modules?

Sometimes. BIOS updates can improve memory training and SPD compatibility. Check your board’s support page, read the changelog, and flash only on a stable system. Back up settings before updating. "Crucial: Memory not recognized"

Is it safe to straighten a bent AMD CPU pin?

It can work, as shown in this case, but it’s risky and at your own risk. A slipped tool can snap a pin and render the CPU unusable. Use minimal force and precise tools if you proceed. [Elektroda, Arabsky, post #17094472]

Should I buy new RAM to fix this symptom?

No, not if both modules pass individually in one slot. That shows your DIMMs are fine. Focus on the second slot, CPU seating, pins, and CMOS reset before replacing hardware. [Elektroda, Arabsky, post #17094223]

What performance loss should I expect if I run single‑channel?

Expect an approximate 5–20% hit in memory‑sensitive workloads. Gaming, compression, and iGPU tasks may show the largest drops. Bandwidth‑light tasks might show less impact. "GamersNexus: Single vs Dual-Channel Memory Performance"

How should I install a 2x8GB DDR3 kit for dual‑channel?

Use the two matched‑color slots specified in your manual, often A2 and B2. Align the notch, press evenly until both latches click. Mixing slots incorrectly forces single‑channel operation and reduces bandwidth. "Kingston Memory Installation Guide"
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