Slow Internet Download Speed with Intel X550-T2

[groundswell]

Hi,

I recently needed to reformat my HDD and reinstall Windows 11 version 23H2. After getting everything back installed, I noticed that my internet download speeds are pretty slow on this system. Upload speeds are fine. Prior to reinstall of Windows 11, my speeds were fine.

This happened once before when I had reformatted and reinstalled Windows and the solution was to use a specific version Intel driver for this card and also the right combination of settings for the network adapter in the advanced properties for the adapter in Device Manager.

I'm hoping someone can help with the right combo!

To give further summary and troubleshooting I have tried:

• Network adapter installed is 10Gb PCI-E NIC Network Card for Intel X550-T2, 1GbE/2.5GbE/5GbE/10GbE Copper Dual RJ45 Port, with Intel ELX550AT2 controller.
• Currently have the latest Intel drivers installed for network adapter (Driver version 4.1.254.0 installed from Intel® Ethernet Adapter Complete Driver Pack version 29.2)
• Replaced all network cables on computer and router (using CAT7)
• If I do SMB file transfers to another 10GB enabled computer on my LAN, i get the full 10GB speeds (upload and download).
• I have a 5GB ATT fiber internet connection. I ran bandwidth test from router and get full speed (upload and download). 
• When running speedtest on my desktop with X550-T2, I get full upload speeds but download speeds are just over 1GB speeds.
• I tried the following settings below noted on another Intel forum post for this same model and it didn't really make any difference.

• Set Jumbo Packet to 9014 bytes

  Set Receive buffers to 4096

  Set Transmit buffers to 16384

I do believe this issue is a driver related/adapter settings related issue. I've been working in IT for 25+ years and can rule out that it's a defective adapter/faulty cables.

Hopefully someone has some recommended settings/driver version to try. I'm even open to purchasing a different model 10GB network adapter if there's one that's more compatible with Windows 11.

Thanks!

[pujeeth]

Hello groundswell,

Thank you for posting in the Intel Community. We sincerely apologize for the delay in our response. We have received your concern and would like to assure you that assisting you is our top priority.

Could you kindly let us know if the issue has been resolved, or if you require further assistance from us? Your prompt response will greatly help us in diagnosing and resolving the issue as quickly as possible.

We appreciate your patience and understanding, and we look forward to hearing from you soon.

Regards

Pujeeth

[pujeeth]

Hello groundswell,

Thank you for contacting Intel.

This is the first follow-up regarding the issue you reported to us.

We wanted to inquire whether you had the opportunity to review the plan of action (POA) we provided.

Feel free to reply to this email, and we'll be more than happy to assist you further.

Regards,

Pujeeth

Intel Customer Support Technician

[pujeeth]

Hello groundswell,

Greetings!

We will proceed to close this case. If you find that you still required assistance, we kindly request you to respond to the case. This will allow us to either reopen the current case or initiate a new one.

Regards

Pujeeth