Which RAM for Ryzen 5 4600H?

Discussion in 'Hardware Components and Aftermarket Upgrades' started by laptopnoob678, Jul 30, 2020.

  1. Deks

    Deks Notebook Prophet

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    I was under the impression XMP can overclock the RAM to higher frequencies, but that timings themselves don't intricately depend on XMP profile.
    Still, frequencies cannot function without certain timings, so it makes sense that those would tie into it.
    Though, why isn't JEDEC modified to operate on CL16 in the first place?
    Why bother with XMP?
     
  2. yrekabakery

    yrekabakery Notebook Virtuoso

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    JEDEC timings need to be conservative for broad compatibility reasons. 3200MHz CL16 would certainly not run on the vast majority of laptops and cause issues with non-boot and blue screening.
     
  3. laptopnoob678

    laptopnoob678 Notebook Consultant

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    So I don't fully understand this.

    upload_2020-8-2_15-46-52.png

    Does this mean that I would see no difference between the following sticks of RAM

    DDR4-1600 CL10
    DDR4-2400 CL15
    DDR4-3200 CL20

    And do manufacturers every make sticks of RAM that are sold as say DDR4-3200 CL20 but it's actually DDR4-2666 CL20 with XMP for 3200Mhz?
     
  4. yrekabakery

    yrekabakery Notebook Virtuoso

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    Those three have the same true latency, but 3200C20 would be best since it has the highest throughput at the same true latency.

    3200C20 is an official JEDEC timing, it wouldn’t require XMP to run at that spec, assuming your platform supports that speed.
     
  5. laptopnoob678

    laptopnoob678 Notebook Consultant

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    But is it possible for a manufacturer to sell RAM which is say JEDEC 2400C15 but has XMP profiles for 3200C20, and then sell it as that?
    Just found this on eBay

    https://www.kingston.com/dataSheets/HX429S17IBK2_32.pdf

    Apparently it's standard JEDEC/PnP timing is 2933C17 which would make it faster than 3200C20 or anything else

    But CL17 isn't listed for 2933MHz on the Wiki...

    I do not understand this at all :(
     
  6. win32asmguy

    win32asmguy Moderator Moderator

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    I tested this kit in the G5 SE and it worked fine at DDR4-3200 CL20:

    https://www.kingston.com/dataSheets/HX432S20IBK2_32.pdf

    I also tested a DDR4-2666 CL15 kit in it as well, which worked fine, but I noticed that infinity fabric never scaled up above 2666mhz with that kit installed, so running at the slower speed may be more detrimental overall. I also believe the IGPU can benefit from increased memory bandwidth as it copies framebuffers from the dedicated GPU into system ram for output on the internal LCD.

    That being said I am curious about the differences with the 2933 CL17 ram, so if you do get it be sure and report your findings!
     
  7. Thinkingbear

    Thinkingbear Notebook Enthusiast

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    I will second these. They are Micron E-die. You will get 3200 @ 1.2V out of the box, and mine are working at 3460 using the default 3200 timings. YMMV
     
  8. Casowen

    Casowen Notebook Evangelist

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    I would advise against the hyperX 3200. What makes ram fast is actually true latency, which essential the lower the value the better. The latency for them will be 12.5 , while the 2666 at CL15 will be 11.25 from hyper x. The main forerunner for none xmp systems that cannot change memory timings is the corsair vengeance 3000 CL16.

    It will also depend on the software, and for that matter I am not certain how ryzen works well enough. Also, remember to get dual rank ram sticks as well.
     
  9. yrekabakery

    yrekabakery Notebook Virtuoso

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    I have these. They still require XMP, otherwise will run at 2666 CL18.
     
  10. laptopnoob678

    laptopnoob678 Notebook Consultant

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    Yep I got the 2666 CL15 kit and noticed the same thing. 2933C17 and 3200C20 are both so much more expensive though from what I can find
     
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