B450M-HDV R4.0 LAN speed question
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=113606
Printed Date: 04 Nov 2026 at 7:24pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: B450M-HDV R4.0 LAN speed question
Posted By: nobana1
Subject: B450M-HDV R4.0 LAN speed question
Date Posted: 04 Nov 2026 at 6:05pm
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GOOD DAY EVERYONE!!! On the ASRock B450M-HDV R4.0 motherboard, the network card shows an outgoing speed that's almost 2 times lower than the incoming speed, but the speeds should be equal. The cable is fine. On one PC (configuration in the profile) it's 960 vs 940 Mb/s. I have no idea what to do?! |
Replies:
Posted By: Xaltar
Date Posted: 04 Nov 2026 at 6:33pm
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I am not sure I understand what you are asking here. Incoming speeds from ISPs are almost always much higher than outgoing. Internal LAN performance should be closer when it comes to incoming and outgoing (between 2 local PCs on the same network). If you have an issue with a local network then make sure you are using a proper CAT6 ethernet cable not a CAT5. A CAT5e cable should also work fine as it tops out at 1000mb/s, it should be printed on the cable itself. With CAT 5e however you have no headroom and any damage on the cable or an overly long cable run will cause the system to auto negotiate to 100mb/s. Make sure your LAN adapter is set to "Auto negotiate" under it's Duplex settings. Let me know if any of that helps. ------------- 
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Posted By: nobana1
Date Posted: 04 Nov 2026 at 6:55pm
| On PC 1, the download speed is 961 Mbps and the upload speed is 952 Mbps. PC 2 is equipped with a high-speed network adapterˇXthe speed reaches 961, but it plateaus there (it won't go any higher). |
Posted By: nobana1
Date Posted: 04 Nov 2026 at 6:56pm
| My network adapter is set to "Auto-negotiation" in the duplex settings. |
Posted By: nobana1
Date Posted: 04 Nov 2026 at 7:01pm
| On PC 1, the download speed is 961 Mbps and the upload speed is 952 Mbps. PC 2 is equipped with a high-speed network adapter; the speed reaches 654 Mbps but stabilizes at that level (it does not go any higher). |
Posted By: nobana1
Date Posted: 04 Nov 2026 at 7:20pm
| Booted from a flash drive with a clean install of Windows 10 ˇX speeds are 943/897 ˇX so the network card is fine; something at the software level is throttling the speed. |