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I helped my son build a gaming/school PC in November 2019. It works fine except he noticed a month ago that he only gets 20MB/s on speed tests to the internet. All the other computers in the house regularly get around 100 MB/s.

We switched cables, changed ports on the switch and re-installed the MSI LAN drivers. I was thinking that he installed some MSI QoS software that was throttling so I looked at all of the installed software and didn't see anything that stands out to me. He does have a lot of gaming stuff installed along with Discord and I don't know what off hand.

We did several IPerf local LAN tests and he gets about 700MB/s between his and mine. I reversed server/client and tested again and stayed at 700MB/s.

I tested between 2 other machines with IPerf and got 700MB/s. Then tested these computers with speed test and got 110MB/s to the internet.

We have tested his PC several times and it's always just a hair over 20MB/s. So I strongly suspect something in his PC or the router is throttling it.

I've taken about 5 semesters of Cisco Networking class along with some Linux classes a few years ago. So I know a few things.

Can you guys help me solve this?

Thanks
Marc

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His PC has:

OS:
Windows 10

Motherboard:
MSI B450 TOMAHAWK MAX AM4 AMD B450
https://www.newegg.com/msi-b450-tomahawk-max/p/N82E16813144267

CPU:
AMD Ryzen 5 2600
https://www.newegg.com/amd-ryzen-5-2600/p/N82E16819113496

RAM:
G.Skill 16GB (2 x 8GB) Ripjaws V Series F4-3200C16D-16GVRB
https://www.newegg.com/g-skill-16gb-288-pin-ddr4-sdram/p/N82E16820231977

PSU:
EVGA SuperNOVA 650 G1 120-G1-0650-XR 80+ GOLD 650W
https://www.newegg.com/evga-supernova-120-g1-0650-xr-650w/p/N82E16817438026?Item=N82E16817438026

SSD Hard Drive:
Crucial MX500 250GB

Platter Hard Drive:
WD Blue 3TB PC

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My network includes:

ISP:
Charter/Spectrum

Modem:
Info available upon request

Router:
NETGEAR Nighthawk X4S Smart WiFi Router (R7800) - AC2600
https://www.newegg.com/netgear-r7800-100nas-ieee-802-11-b-g-n-2-4-ghz-256-qam-support-ieee-802-11-a-n-ac-5-0-ghz/p/N82E16833122818

Switch:
Linksys Business LGS308 8-Port Gigabit Ethernet Smart Switch
https://smile.amazon.com/gp/product/B00IXNQ6XQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
 

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BSOD Analyst Student at Sysnative com
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235 Posts
Plug his computer direct into the modem---test.
Test it in safe mode with networking without all the other programs mentioned traffic involved. Just to rule that out or in.
Check the router firmware for an upgrade.
Do you see any QOS variables in the router software that can be toggled on or off?
 

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Team Manager - Hardware, Acting Manager, Security
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14,557 Posts
In the past I have seen AMD software utilities slow the internet but can't remember which, but what I do remember is whatever the utility was it sounded like it would speed up the syste4m and did the opposite, so my suggestion would be to uninstall all unessential AMD software (which is everything except drivers) and always go to mobo mfgr site and update to all all newer drivers available.
 
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TSF Moderator , Hardware Team
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2,463 Posts
Same thing on my LAN port using Big Foot Killer 2200 software. As soon as I installed that my system speed was cut in half. I uninstalled it and the driver rebooted and let windows pick up the driver and my system took about an hour to come around.

Now it'a back the lightning fast speed.
 
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