Z690 Pro-A Wifi DDR4 - Intel I225-V (Rev 3) ethernet speed issues

JaGr

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So today I just got upgraded to Gigabit internet which revealed an issue in that my ethernet connection is being artificially capped out at ~150 Mbps no matter what in the hell I do.

I say it's artificially capped because, after a full day of scouring the internet trying and failing to find a permanent solution, I eventually found one that apparently worked which was to rollback the driver from 1.0.2.14 to 1.2.0.13. This initially seemed to work as my speedtest went from ~150Mbps to a more acceptable ~750Mbps, but then hours later when I decided to run the test again I discovered I was back down to 150 for reasons that escape me and my sanity.
I've tried uninstalling the device wholesale and then popping the .13 driver back in, and after rebooting it was once again working for all of 3 tests back-to-back before dropping back off the cliff to 150 on the 4th consecutive test (ie: about 1 minute).

My speed on Wi-fi largely works (550~600) but I'd like to not have to just park my desktop on wifi and forget the ethernet port exists if at all possible.

Someone please save my poor sanity.
 

fatedust

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Do you have MSI Center installed? There's one feature set named "LAN Manager", try to remove it and see if your ethernet speed is back to normal.
Btw, could you press Windows key + Pause key and check your Windows 10 version and OS build?
 

JaGr

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I do not have LAN Manager installed.

OS info:
- Windows 10 Education
- Version 21H2
- Build 19044.1826
 

doug.hogart153b02d9

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This is just a guess but...
Somewhere else today I noticed a message that if you have something like a fiber ONT which enables IPv6 it may have a bug which needs a workaround on Intel wired NIC. If that happens to sound like your situation, go to the properties of the Intel NIC, and under the Advanced tab find TCP Checksum Offload (IPv6) and change that setting to Disabled (or Tx_Enabled).
 

JaGr

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Unfortunately still the same story; After a few uninstalls and reinstalls then a reboot of my computer, it starts out testing at 700Mbps but then after a minute or two the tests are back down to 150Mbps for some godforsaken and inexplicable reason
 

fatedust

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I do not have LAN Manager installed.
That's good.

OS info:
- Windows 10 Education
- Version 21H2
- Build 19044.1826
This is good too, Window 10 is the latest version.

What internet browser and which speedtest website are you using?
If you keep running speedtest, did download speed bounce back to 700Mbps from time to time or it seems to be limited to 150Mbps? How about upload speed?
 

JaGr

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Firefox, Ookla speedtest.net
Speed remains limited in the 150~170 Mbps range permanently after it drops for the first time. Upload speed is 100Mbps, which is the limit provided by the current plan
 

Richj44

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Firefox, Ookla speedtest.net
Speed remains limited in the 150~170 Mbps range permanently after it drops for the first time. Upload speed is 100Mbps, which is the limit provided by the current plan
I'm surprised no one has mentioned checking your ethernet cable yet. Try a new, good quality cat 5 or 6 cable and see if there's any difference.
 

JaGr

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Both fortunately and unfortunately it's not the cable.

I forgot that I had actually already bought a capable USB-C to Ethernet adapter 2 years ago, with that plugged in I'm testing ~700 consistently.

Not quite the 940 peak for the internet plan, but that's likely the ISP's problem rather than any of my home hardware.
 

Richj44

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Both fortunately and unfortunately it's not the cable.

I forgot that I had actually already bought a capable USB-C to Ethernet adapter 2 years ago, with that plugged in I'm testing ~700 consistently.

Not quite the 940 peak for the internet plan, but that's likely the ISP's problem rather than any of my home hardware.
Out of curiosity, how did you rule out the cable as the problem?
 

JaGr

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Well I suppose I could technically still try with another cable to see if my speed goes even higher.

But in regards to the main problem of my ethernet speed being capped at 150 Mbps, the cable is ruled out as an issue because using the USB adapter with the same cable has consistently tested at 700+ Mbps throughout the day.
 

Richj44

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Well I suppose I could technically still try with another cable to see if my speed goes even higher.

But in regards to the main problem of my ethernet speed being capped at 150 Mbps, the cable is ruled out as an issue because using the USB adapter with the same cable has consistently tested at 700+ Mbps throughout the day.
Thanks for clarifying, I'm a little slow and didn't get that you were using the same cable with the USB adapter.
 

wroger196157202e2

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Well I suppose I could technically still try with another cable to see if my speed goes even higher.

But in regards to the main problem of my ethernet speed being capped at 150 Mbps, the cable is ruled out as an issue because using the USB adapter with the same cable has consistently tested at 700+ Mbps throughout the day.
try looking at this post: MSI PRO Z690-A WIFI DDR4 and Intel i225-v LAN | Page 2 | MSI Global English Forum - Index and on post#23 their problem was solved by disabling TCP-IPv6 Checksum Offload. I don't have gigabit internet (50mb only atm) but I tried it and my internet on the Intel i225 runs a lot smoother. Apparently there is a known bug.
 

JaGr

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Unfortunately I had also tried that but it didn't work.
At this point I'll just stick to the adapter I think, and be sure to investigate such components the next time I buy a motherboard
 
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