https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 30 Apr 2026 10:02:06 +0000 Thu, 02 Oct 2025 19:56:38 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=23573 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=23573&PID=199122&title=cant-get-over-100mbps-on-b450m-pro4#199122 Author: Ricardo_63
Subject: 23573
Posted: 02 Oct 2025 at 7:56pm

Is not a cable issue, clearly is driver issue.
Windows assign and use a default driver, motherboards (as ASRock) Network Interface Controllers (NICs) and Communications Network ICs support speeds of 100 Mbps, 1 Gbps, and 2.5/5 Gbps.
In case of 5G Gigabit Ethernet it needs GbE Family Controller Driver, thus it must check on Windows -> Device Manager -> network adapter -> advance properties, if loaded 5G driver parameters and GigaBit Lite must be enable, otherwise network interface it will be limited to Fast Ethernet (10/100 Mbps).]]> Thu, 02 Oct 2025 19:56:38 +0000 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=199122&title=cant-get-over-100mbps-on-b450m-pro4#199122 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=199121&title=cant-get-over-100mbps-on-b450m-pro4#199121 Author: neolz75
Subject: 23573
Posted: 02 Oct 2025 at 1:43pm

could be a low quality faulty ethernet cable, change cable and recheck or use the cable on another system if it shows at connection speed at 1Gbps.

]]> Thu, 02 Oct 2025 13:43:49 +0000 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=199121&title=cant-get-over-100mbps-on-b450m-pro4#199121 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=199093&title=cant-get-over-100mbps-on-b450m-pro4#199093 Author: Ricardo_63
Subject: 23573
Posted: 30 Sep 2025 at 8:34pm

Hi, have the same issue here and I sure it becomes from UEFI issue.
In case by modifying Ethernet interface parameters to achieving a speed greater than 100MB, after power off and on it return to 100 MB LAN speed.]]> Tue, 30 Sep 2025 20:34:41 +0000 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=199093&title=cant-get-over-100mbps-on-b450m-pro4#199093 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=100550&title=cant-get-over-100mbps-on-b450m-pro4#100550 Author: threadzipper1957
Subject: 23573
Posted: 13 Jul 2022 at 8:57pm

Or try to make a bootable USB stick with Rufus, and create a USB stick with Ubuntu.
Start the system, press f11, and select the USB stick, to boot from.
You can run Ubuntu from the USB stick without installing.
If the speed is the same, it is hardware related, if not, software related]]> Wed, 13 Jul 2022 20:57:28 +0000 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=100550&title=cant-get-over-100mbps-on-b450m-pro4#100550 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=100549&title=cant-get-over-100mbps-on-b450m-pro4#100549 Author: threadzipper1957
Subject: 23573
Posted: 13 Jul 2022 at 8:54pm

Dear MNA377,

When the system is switched on, your modem and LAN chip negotiate the protocol, and speed.
Sometimes this is a compatibility issue between those 2, and a firmware update for the modem is required, this sometimes happens with Fritzbox.
Look at the online manual, becasue the lights on the LAN port, also show the selected speed.
You can try to set it to a fixed speed, or try half duplex of full duplex.
If possible put a gigabit switch in between]]> Wed, 13 Jul 2022 20:54:14 +0000 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=100549&title=cant-get-over-100mbps-on-b450m-pro4#100549 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=99152&title=cant-get-over-100mbps-on-b450m-pro4#99152 Author: MNA377
Subject: 23573
Posted: 27 May 2022 at 8:03am

I bought this pre-built PC that came with a B450M Pro4 motherboard and even though in the specs page it says PCIE x1 Gigabit LAN 10/100/1000 Mb/s, I can't seem to get over 100MBPS on an Ethernet connection.

I'm positive it isn't the cable (it can handle the speed) or the modem (I'm getting 400MBPS+ on Wifi).

I've tried downloading the Realtek Lan driver ver:10050_07122021 and installing it but once I check the Ethernet stats (Win + R, ncpa.cpl) it still shows 100MBPS speed.

Not sure if it's just impossible to increase the ethernet port speed on the motherboard or I clearly don't know what I'm doing, or maybe both.

Any help will be greatly appreciated! ]]> Fri, 27 May 2022 08:03:59 +0000 https://forum.asrock.com/forum_posts.asp?TID=23573&PID=99152&title=cant-get-over-100mbps-on-b450m-pro4#99152