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AMD Ryzen 9 3900X Linux Memory Scaling Performance

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  • vladpetric
    replied
    What is the speed benefit (geometric mean) if synthetic benchmarks (e.g., Memory copy) are excluded?

    I have a feeling that without those, the worst-best difference is less pronounced.

    Leave a comment:


  • willmore
    replied
    Originally posted by audir8 View Post
    Is this on FIOS, AT&T or Google Fiber if you don't mind my asking?
    It's a regional ISP in the midwest USA. The alternative providers are Comcast (cable) and AT&T(DSL).

    Leave a comment:


  • audir8
    replied
    Originally posted by willmore View Post

    You're misunderstanding the meaning of latency here.

    If you're interested in decreasing latency, you're first thing to do is to move to all wired networking--wireless adds 8-10ms. The next step would be to get a fiber internet connection. For me, that saved about 30ms when I switched from cable: 32ms down to 2ms.
    Is this on FIOS, AT&T or Google Fiber if you don't mind my asking?

    My point is even if CL14 vs CL16 renders something 1ms quicker or sends a packet out 1ms quicker (kind of a big ask), this is only 1/50th the variance of visual reaction time of 50ms or more if human visual reaction time is between 200-250ms. Your reaction just needs to be 1ms worse for any latency gains to be nil. I'm not misunderstanding latency, just putting it in context of human reaction time.

    I'm not against low latency setups, just that the cost of one might not be right for every gamer.

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  • willmore
    replied
    Originally posted by audir8 View Post
    Compared to a human reaction time of 150-250ms, worrying about CL14 vs CL16 is pretty much snake oil.
    You're misunderstanding the meaning of latency here.

    If you're interested in decreasing latency, you're first thing to do is to move to all wired networking--wireless adds 8-10ms. The next step would be to get a fiber internet connection. For me, that saved about 30ms when I switched from cable: 32ms down to 2ms.

    Leave a comment:


  • audir8
    replied
    I get ~150-200 HD FPS on CS:GO highest settings with my 1700/64GB(CL16)+RX580. Switching from wireless to wired internet will probably get me the combined effect of low latency CL14 RAM/kernel/mouse/keyboard/monitor/router and then some. Spending the money on an end-to-end low latency setup might be worth it for those serious about FPS/RTS competitive games, but for those playing anything else, it's a much harder sell.

    Compared to a human reaction time of 150-250ms, worrying about CL14 vs CL16 is pretty much snake oil.
    Last edited by audir8; 12 July 2019, 09:14 PM.

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  • pheldens
    replied
    for gaming you need 3200 CL14 for good IPC, and a cpu with high single thread performance, 3600X is perfect if you dont plan to livestream like a cam thot.

    This test is kind of pointless without mentioning the timings.
    Last edited by pheldens; 12 July 2019, 07:57 AM.

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  • glock24
    replied
    Wow, those are some ugly looking RAM modules!

    Zen2 looks to scale very nicely with memory bandwidth, up to a point. Would be nice to know pricing trends of DDR4 modules at tested speeds.
    Last edited by glock24; 11 July 2019, 03:22 PM. Reason: phone autocorrect seems to be on crack today.

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  • Imroy
    replied
    What about with a B450 motherboard? The X570 boards are expensive and I have no need for PCIe 4.0.

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  • audir8
    replied
    Zen 2 takes 32GB DIMMs, and the max is 128GB. But I see 32GB modules are still rare. Wondering what the top speed you can get with 128GB is.. I've yet to read anyone do better than 2666 with 64GB+Zen 1 (It's what I have on my 1700), and 3000 with 64GB+Zen 1+.

    Getting 4x16GB 3200 CL16 today is definitely justified, pushing it to 3400 at CL18 might be possible at 64GB but probably not with 128GB. I don't have the patience for playing RAM+motherboard compatibility games, so just trying to get good speeds at good value. A Gentoo user can always use more RAM, and more RAM usually means you can delay the full upgrade cycle a bit.

    Leave a comment:


  • rlkrlk
    replied
    Originally posted by xorbe View Post
    4x16GB is looking at 2666 speeds though.
    I'm running 4x16GB at 3000 on an Asus Prime X470 Pro w/2700X and it has been solid. If you need 64 GB for what you're doing (I don't really -- yet -- but eventually I think I will), that's a lot more important than the clock speed of the RAM.

    The DIMMs are G.Skill F4-3000C16-16GVRB
    Last edited by rlkrlk; 10 July 2019, 01:44 PM.

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