F5F Stay Refreshed Hardware Desktop Realtek gigabit ethernet port capped at 100mbps at 1.0gbps speed setting

Realtek gigabit ethernet port capped at 100mbps at 1.0gbps speed setting

Realtek gigabit ethernet port capped at 100mbps at 1.0gbps speed setting

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timo_1892
Senior Member
715
02-18-2023, 02:18 PM
#1
Hello, I own an older machine that my parents rely on for basic internet use. We have a Windows Server acting as a NAS, all connected via Gigabit Ethernet through a TP-Link switch. The issue is that this old PC (Intel Core i5 3450; Gigabyte H61M-S2v-B3 board; 6GB DDR3 RAM; Windows 7 Ultimate 64-bit SP1 Build 7601; Realtek RTL8111E chip) only reaches up to 100 Mbps. I've tried various adjustments—changing the network driver settings, updating drivers via manufacturer sites, switching to different Ethernet cables (Cat 5e and 6A), connecting to the switch and router—but nothing works. Windows in the adapter info keeps stating a 100 Mbps connection regardless of changes. Other devices on the same switch are functioning normally. I have no idea what else I should do.
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timo_1892
02-18-2023, 02:18 PM #1

Hello, I own an older machine that my parents rely on for basic internet use. We have a Windows Server acting as a NAS, all connected via Gigabit Ethernet through a TP-Link switch. The issue is that this old PC (Intel Core i5 3450; Gigabyte H61M-S2v-B3 board; 6GB DDR3 RAM; Windows 7 Ultimate 64-bit SP1 Build 7601; Realtek RTL8111E chip) only reaches up to 100 Mbps. I've tried various adjustments—changing the network driver settings, updating drivers via manufacturer sites, switching to different Ethernet cables (Cat 5e and 6A), connecting to the switch and router—but nothing works. Windows in the adapter info keeps stating a 100 Mbps connection regardless of changes. Other devices on the same switch are functioning normally. I have no idea what else I should do.

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MertArici
Junior Member
15
02-18-2023, 02:18 PM
#2
Maybe the motherboard's RJ45 port got damaged. All eight pins must function correctly for gigabit performance; otherwise it will revert to slower speeds. Would you try using a gigabit adapter such as this one? https://www.amazon.com/TP-Link-1000Mbps-...003CFATNI/
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MertArici
02-18-2023, 02:18 PM #2

Maybe the motherboard's RJ45 port got damaged. All eight pins must function correctly for gigabit performance; otherwise it will revert to slower speeds. Would you try using a gigabit adapter such as this one? https://www.amazon.com/TP-Link-1000Mbps-...003CFATNI/

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opus21
Junior Member
12
02-18-2023, 02:18 PM
#3
Yes, I overlooked mentioning it. I used the PCIe network adapter connected to my server. After connecting and checking the speed on the computer, it displayed the correct gigabit rate. The issue lies with the built-in Ethernet port. Since there isn’t another available, I’m trying to figure out a solution to resolve this.
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opus21
02-18-2023, 02:18 PM #3

Yes, I overlooked mentioning it. I used the PCIe network adapter connected to my server. After connecting and checking the speed on the computer, it displayed the correct gigabit rate. The issue lies with the built-in Ethernet port. Since there isn’t another available, I’m trying to figure out a solution to resolve this.

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Oshi_
Junior Member
41
02-18-2023, 02:18 PM
#4
can you check if all the pins are fine ? if there fine you may need a network card or you integrated card may not support 1gb full duplex despite being a gigabit capable lan
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Oshi_
02-18-2023, 02:18 PM #4

can you check if all the pins are fine ? if there fine you may need a network card or you integrated card may not support 1gb full duplex despite being a gigabit capable lan

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DantehIsGay
Posting Freak
902
02-18-2023, 02:18 PM
#5
You can choose a second-hand card at a low price in the used market.
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DantehIsGay
02-18-2023, 02:18 PM #5

You can choose a second-hand card at a low price in the used market.

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imTri
Posting Freak
786
02-18-2023, 02:18 PM
#6
I didn't inspect the motherboard pins, just noticed they were okay. To confirm, I cleaned them with isopropyl alcohol and a swab very gently—suddenly everything worked. Windows recognized the gigabit connection, and the orange light came on. I think the old PC had accumulated a lot of dust, causing some pins to misconnect. Thanks for your assistance!
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imTri
02-18-2023, 02:18 PM #6

I didn't inspect the motherboard pins, just noticed they were okay. To confirm, I cleaned them with isopropyl alcohol and a swab very gently—suddenly everything worked. Windows recognized the gigabit connection, and the orange light came on. I think the old PC had accumulated a lot of dust, causing some pins to misconnect. Thanks for your assistance!