Subpar download speed with Ryzen 1800x - 2 CPU cores at 100%

  1. Posts : 13
    Windows 10 Pro x64 v1703
       24 Jan 2018 #1

    Subpar download speed with Ryzen 1800x - 2 CPU cores at 100%


    I've a problem that's bugging me since I bought my Ryzen platform (specs are on my profile), and that problem is that my download speed is subpar (it doesn't reach close to 1Gbps like my old 3930k @4.5GHz would) vs what I got with my old platform. Before I only had this problem when I enabled an Hyper-V External Virtual Switch, now the problem manifests itself even without it.
    For example, below is a screenshot of a Speedtest run to my closest server which belongs to my ISP (notice how 2 cores are fully maxed out). I'm getting 835 Mbps when I should be getting around 920 Mbps:
    Click image for larger version. 

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    Just look at the two cores being maxed out.

    Now here is an Iperf3 (with -R flags so I can test the download speed) test inside the LAN (notice again 2 CPU cores almost maxed out). On this test I'm getting download speeds of 737 Mbps, while I should be getting around 941 Mbps:
    Click image for larger version. 

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    Now the strange thing is that the upload speed isn't affected (the server is an HTPC with an AMD A8-6600k), for example, an Iperf3 test with -R flag. Notice that now I'm getting 942 Mbps:
    Click image for larger version. 

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    I've already tried to disable the anti-virus & firewall software, but the result is the same.
    Does anyone have an idea why this is happening? The Ryzen 1800x is way more powerful than the A8-6600K, but it (the A8) outperforms the Ryzen on download/upload speed.

    Attached Thumbnails Attached Thumbnails Speedtest Ryzen 1800x saturates 2 cores.jpg  
      My ComputerSystem Spec


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