Can I mix Ram Sizes?

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  1. Posts : 43,260
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #11

    It may also be of interest to consider how much (or little) extra performance you get with dual channel vs single. Superficially you can move data twice as fast. In practice, it doesn't make as much difference as that:

    Do read through this- I've picked out a couple of points from it.
    Single Channel vs Dual Channel Memory: Which Is Better? | Beebom

    Can I mix Ram Sizes?-1.png

    Single Channel vs Dual Channel Memory: What’s Better For You?

    As you can see, while the Dual Channel Memory does perform better than the Single Channel Memory modules, the difference between the two is in no way staggering. In the end, it all comes down to the price point.
    Does dual-channel memory make difference in gaming performance? - Conclusions of 8 - Hardware Secrets

    Conclusions
    Besides that, theoretically, the dual-channel mode doubles the bandwidth between the CPU and the memory, it does not mandatorily result in a perceptible impact on the performance of a specific program. In most of the games we tested, there was not significant performance gain when we enabled the dual-channel mode.
    In some cases, there was actually a performance drop when the dual-channel mode was enabled. It can be a simple statistic fluctuation (the ideal was to repeat each test dozens of times in each configuration to avoid it, which is not viable) or even a behavior of the CPU memory controller, working more optimally (maybe with smaller latencies) in the single channel mode.
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  2. Posts : 300
    Windows 10
    Thread Starter
       #12

    Ahhh I see. So that means I can only use a maximum of 4gb's? per slot? That would explain the motherboards maximum limit of 24 gb's. I'm pretty sure you just saved me from buying 8bg ram! :O

    In regards to the A1, A2, B1, B2, C1, C2 however, does that mean I should be having the same memory sizes for the respective Letter slots?

    So A1 and A2 would have 2, 4gb's and B1 and B2 would have 2, 2gb's? for example?

    Thank you

    - - - Updated - - -

    dalchina said:
    It may also be of interest to consider how much (or little) extra performance you get with dual channel vs single. Superficially you can move data twice as fast. In practice, it doesn't make as much difference as that:



    Do read through this- I've picked out a couple of points from it.
    Single Channel vs Dual Channel Memory: Which Is Better? | Beebom

    Can I mix Ram Sizes?-1.png

    Single Channel vs Dual Channel Memory: What’s Better For You?



    Does dual-channel memory make difference in gaming performance? - Conclusions of 8 - Hardware Secrets
    Thank you Dalchina, I suppose what I'm trying to grasp now is what the next step for me should be and how I should configure my ram onto the ram slots. On hand I have 2, 2gb's (kingstons) and 1, 4gb (Team group) with the other (Team Group) 4gb most likely being faulty and the culprit to my hardware issues.

    So with my current ram for a total of 8gb, should I just go ahead and purchase 2, 4gb's for a total of 16? And how would I place them. I know its probably not the best having 3 different ram brands but given my situation it might be hard, unless i buy 4x 4gb's and replace all my current ram or top up what I already have.

    Edit: I completely forgot, the speeds have to be the same right? Then that means I'd have to replace them all as I think it would be incredibly hard to find DDR3 RAM at 1066mhz.

    Edit: Can I use DDR3L? DDR3L seems to support both voltage types as opposed to normal DDR3, so im thinking it's okay?

    Thank you, your input is always appreciated.
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  3. Posts : 6,482
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #13

    Most computers can work on dual channels. Data is split ed in two. Half goes to channel A and Half goes to channel B doubling (theoretical) it speed. It is like a RAID 0 on memory.
    Sticks on A1 and B1 should be a matched pair.
    Sticks on A2 and B2 should be a matched pair.
    A1 and A2 can be different in size but should be the same in speed and timings.

    Your computer work on three channels. Data is split ed in three. 1/3 goes to channel A, 1/3 goes to channel B and 1/3 goes to channel C, tripling (theoretical) it speed.
    Sticks on A1, B1 and C1 should be a matched pair.
    Sticks on A2, B2 and C2 should be a matched pair.
    A1 and A2 can be different in size but should be the same in speed and timings.
      My Computers


  4. Posts : 300
    Windows 10
    Thread Starter
       #14

    Megahertz said:
    Most computers can work on dual channels. Data is split ed in two. Half goes to channel A and Half goes to channel B doubling (theoretical) it speed. It is like a RAID 0 on memory.
    Sticks on A1 and B1 should be a matched pair.
    Sticks on A2 and B2 should be a matched pair.
    A1 and A2 can be different in size but should be the same in speed and timings.

    Your computer work on three channels. Data is split ed in three. 1/3 goes to channel A, 1/3 goes to channel B and 1/3 goes to channel C, tripling (theoretical) it speed.
    Sticks on A1, B1 and C1 should be a matched pair.
    Sticks on A2, B2 and C2 should be a matched pair.
    A1 and A2 can be different in size but should be the same in speed and timings.
    So basically I'd want to go 4gb each on channels A1, B1 and C1.

    How was I able to run 2gbs 1 brand in slot A1 and A2 and 4gbs another brand in slot B1 and B2 for the longest time?

    I hope I understand you correctly, I'm not the smartest in regards to computers, mostly only have general knowledge. Thank you
      My Computer


  5. Posts : 18,440
    Windows 11 Pro
       #15

    It doesn't even to be the same speed.
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  6. Posts : 6,482
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #16

    Vellaura said:
    So basically I'd want to go 4gb each on channels A1, B1 and C1.

    How was I able to run 2gbs 1 brand in slot A1 and A2 and 4gbs another brand in slot B1 and B2 for the longest time?

    I hope I understand you correctly, I'm not the smartest in regards to computers, mostly only have general knowledge. Thank you
    You can wear a tennis on one foot and a boot on the other and walk without falling. But you may fall if you try to race with them.
    Please read and understand your MB manual (post # 10)
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  7. Posts : 300
    Windows 10
    Thread Starter
       #17

    NavyLCDR said:
    It doesn't even to be the same speed.
    Really? Is it more of a preferred option?

    - - - Updated - - -

    Megahertz said:
    You can wear a tennis on one foot and a boot on the other and walk without falling. But you may fall if you try to race with them.
    Please read and understand your MB manual (post # 10)
    I see your point, thank you. I think I'm getting it. Sometimes I just need a example or another way of explaining for me to get it ._.
      My Computer


  8. Posts : 18,440
    Windows 11 Pro
       #18

    @Vellaura,

    Ideally your RAM should all be exactly the same. If you want 16 GB RAM then you would want either 2x 8 GB or 4x 4 GB all the same. That's ideal. But it isn't required. This is the mix that is in my laptop, which only has 2 DIMM slots:

    Can I mix Ram Sizes?-capture.jpg

    As you can see, I have two different manufacturers and two different speeds. I have zero RAM issues with my laptop. Sometimes mixing works, sometimes it doesn't. I think I ended up with this mix because I pulled a RAM stick from an old computer and stuck it in this one to see if it work, and by golly it sure did!
      My Computer


  9. Posts : 300
    Windows 10
    Thread Starter
       #19

    NavyLCDR said:
    @Vellaura,

    Ideally your RAM should all be exactly the same. If you want 16 GB RAM then you would want either 2x 8 GB or 4x 4 GB all the same. That's ideal. But it isn't required. This is the mix that is in my laptop, which only has 2 DIMM slots:

    Can I mix Ram Sizes?-capture.jpg

    As you can see, I have two different manufacturers and two different speeds. I have zero RAM issues with my laptop. Sometimes mixing works, sometimes it doesn't. I think I ended up with this mix because I pulled a RAM stick from an old computer and stuck it in this one to see if it work, and by golly it sure did!
    Oh that's awesome! I think however my motherboard can only handle a max of 4gb per slot. I wonder newer motherboards have anything to do with being able to mix and match easier.

    Currently in the process of figuring out which ram is the bad apple, for example I had 1 2gb in A1. Another in B1 and the 4gb in C1. Pc booted with 0 beeps, I'm suspecting 4gb.
      My Computer


  10. Posts : 18,440
    Windows 11 Pro
       #20

    I believe you would want the pair of 4 GB sticks in A2 and A1 (first grey and red slots closest to the processor). Then you would want the pair of 2 GB sticks in B2 and B1 (the next greay and red slots, in the middle).
      My Computer


 

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