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Does the processor limit the RAM?

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Dipsyz Posted messages 62 Status Member -  
Dipsyz Posted messages 62 Status Member -
Hello,

I bought a custom-built PC, and I noticed that my RAM is stuck at 2400 MHz when it should go up to 3000 MHz. I have the following configuration:
- MSI Z390 Gaming Edge AC
- Intel Core i5-9600KF.
I tried to check the BIOS, but when I want to change and save, I get an error message.
So I was wondering if the problem is simply my processor? Can the i5-9600KF limit the RAM to 2400 or 2600 MHz, for example, so that my RAM cannot reach 3000 MHz?
Thank you in advance!

4 answers

  1.
    epango Posted messages 37195 Registration date   Status Member Last intervention   Ambassadeur 4 270
     
    In RAM frequency, there are two elements that come into play: the CPU and the motherboard (CM). CPUs, for some time now, have an integrated memory controller. The highest memory frequency handled by this controller may differ from that managed by the motherboard if it allows overclocking (O.C). The memory controller of the i5-9600KF manages a maximum frequency of 2666MHz. The MSI Z390 Gaming Edge AC motherboard, allowing O.C, manages frequencies up to 4400MHz. However, to exceed the maximum frequency of 2666MHz of the memory controller, one must enter the BIOS and perform a manipulation. The simplest manipulation is to activate what is called an XMP profile, which will optimize the RAM's operation. Thus, your RAM can operate at its nominal frequency of 3000MHz instead of being downgraded to 2400MHz.

    --
    To misname things is to add to the misery of the world (Albert Camus)
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    1. Dipsyz Posted messages 62 Status Member
       
      Thank you very much!
      Do you know the MSI BIOS? MSI BIOS 5?
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    2. epango Posted messages 37195 Registration date   Status Member Last intervention   4 270 > Dipsyz Posted messages 62 Status Member
       
      In the case of MSI motherboards, I believe that accessing the XMP profile selection is straightforward. It is located on the homepage of the BIOS (EZ Mode). Below XMP, there is a button. If it is set to Off, you click on it. Finally, your motherboard should have come with a manual, which explains this.
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    3. Dipsyz Posted messages 62 Status Member > epango Posted messages 37195 Registration date   Status Member Last intervention  
       
      Yes, I see exactly. I'll try that. Because I've already tried, but in the other BIOS interface, so I tried to set it manually.
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    4. Dipsyz Posted messages 62 Status Member > epango Posted messages 37195 Registration date   Status Member Last intervention  
       
      But what does it change between choosing the XMP or entering the values manually? Because in my case, manually it doesn't work.
      But I'll try the XMP in a moment.
      Anyway, thank you for your help :)
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    5. epango Posted messages 37195 Registration date   Status Member Last intervention   4 270 > Dipsyz Posted messages 62 Status Member
       
      Using XMP is the easiest. But if you can do it manually by choosing a multiplication factor, that's even better.
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  2. jfmimi Posted messages 13734 Registration date   Status Contributor Last intervention   1 929
     
    Hello
    Memory frequency supported by the CPU
    DDR4 2133 MHz
    DDR4 2400 MHz
    DDR4 2666 MHz

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    1. Dipsyz Posted messages 62 Status Member
       
      Does that mean it can't support my RAM, so I bought 3000 MHz for nothing?
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  3. Chris_33000 Posted messages 533 Status Member 48
     
    Hello,
    on your computer, can the "bus" run at 3000 MHz?
    Best regards,
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    1. Dipsyz Posted messages 62 Status Member
       
      Hello,
      I'm not really familiar with this. What is a bus?
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  4. Chris_33000 Posted messages 533 Status Member 48
     
    These are the circuits that connect the components of your computer... processor, memory, disk controllers, etc... There are options in the BIOS where you can adjust the frequency (speed) of these connections, e.g.: your memory supports 3000 but the bus is limited to 2800...etc
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    1. Dipsyz Posted messages 62 Status Member
       
      And how do I see it? Because I know that my motherboard supports it, but I didn't know that the processor doesn't.
      When I check the specifications of my processor, it says: 2133, 2400, and 2666 MHz.
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    2. flo88 Posted messages 28492 Registration date   Status Contributor Last intervention   5 170 > Dipsyz Posted messages 62 Status Member
       
      The scam of the century...
      High-frequency RAM that, in any case, will never work faster than what the processor decides because it is the one that has the memory controller...

      In short, the modules have a chip called SPD in which the DDR frequency profiles are recorded, several JEDEC profiles, and some XMP profiles. We can find them in the BIOS; we need to try them... But there will be no miracles.
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    3. Dipsyz Posted messages 62 Status Member > flo88 Posted messages 28492 Registration date   Status Contributor Last intervention  
       
      So I bought RAM that will never run at 3000 MHz because of the processor?
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    4. flo88 Posted messages 28492 Registration date   Status Contributor Last intervention   5 170 > Dipsyz Posted messages 62 Status Member
       
      It is possible to catch up with the frequency, but it depends on the motherboard.
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    5. Dipsyz Posted messages 62 Status Member > flo88 Posted messages 28492 Registration date   Status Contributor Last intervention  
       
      How to know with which motherboard this is possible?
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