[SOLVED] Help diagnosing low bandwidth on my desktop computer

Sep 6, 2020
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I am currently getting 300 down/10 up from my ISP. With a direct wired connection between my desktop and router, I get around 5 down/0.1 up. I have an external wifi card hooked up to my motherboard via pcie x4 slot. When I switch to wifi I see near identical bandwidth during a speed test, leading me to believe this is not wifi/ethernet specific.

I unplugged the ethernet cable from my desktop and moved the connection to a laptop of mine, and I immediately saw about 250 down/8 up. This leads me to believe that the problem is certainly with the PC and not any cabling or with the router.

I never had any issues until I moved and suddenly I am seeing this problem. I would have thought it was a router / modem issue since it first started happening after moving to a new place and using a new ISP/router. However, only my desktop is experiencing the problem.

Are there any tips I can get to help further diagnose this issue? Could it be a problem with my motherboard?

My Desktop stetup:
  • OS: Windows 10, OS recently updated
  • Motherboard: ASUS Prime z390-a
  • CPU: Intel i7-9700k
  • Ethernet: Cat6
Other trouble shooting I've tried:
  • Restart Computer
  • Update OS
  • Ran anti-malware check (Malware Bytes)
  • run "netsh winsock reset" and restart computer
  • re-seating ethernet cable
  • Disabling and re-enabling network devices from control panel
 
Sep 6, 2020
3
0
20
1
I happened to stumble upon a solution by myself.

What ended up fixing the problem was pressing the reset button on the PC's front panel. After the PC booted back up, speed check showed I had a much more reasonable 260 Mbps bandwidth.

I guess a lesson learned here is try multiple methods of restarting your device, including reset and full power cycle (disconnect power).

Thanks again for the responses!
 

Ralston18

Titan
Moderator
On your desktop/PC verify that only one network adapter, either wired or wireless, is enabled. Not both at the same time.

Manually download the applicable network adapter's drivers via the manufacturer's website. Reinstall and reconfigure.

Run "ipconfig /all" via the Command Prompt and post the results.
 
Sep 6, 2020
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Thanks for the responses, sorry for my slow reply.

I've gone ahead and disabled the WiFi network adapter completely from Device Manager. I didn't notice any difference.

I've also tried reinstalling the LAN driver from ASUS website and restarting the PC: https://www.asus.com/Motherboards/PRIME-Z390-A/HelpDesk_Download/

I'm not convinced anything actually happened after the reinstall, so I additionally uninstalled the ethernet driver via Device Manager, then restarted the PC. Still no difference.

I'm not connected to any sort of VPN. I also tried disabling the public & private Windows firewall, but didn't see any real improvement again.

Here is output from my ipconfig after I disabled the WiFi network adapter.
ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : DESKTOP-8UGB749
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : hsd1.wa.comcast.net.

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . : hsd1.wa.comcast.net.
Description . . . . . . . . . . . : Intel(R) Ethernet Connection (7) I219-V
Physical Address. . . . . . . . . : 04-D9-F5-22-48-19
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2601:602:8b00:4d00:d3e:9359:c3ac:d5f5(Preferred)
Temporary IPv6 Address. . . . . . : 2601:602:8b00:4d00:51dd:dc83:2c52:8496(Preferred)
Link-local IPv6 Address . . . . . : fe80::d3e:9359:c3ac:d5f5%20(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.0.32(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, September 13, 2020 2:06:38 PM
Lease Expires . . . . . . . . . . : Monday, September 14, 2020 2:06:37 PM
Default Gateway . . . . . . . . . : fe80::ea91:20ff:fef8:a8c6%20
192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DHCPv6 IAID . . . . . . . . . . . : 335862261
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-25-15-8E-FF-04-D9-F5-22-48-19
DNS Servers . . . . . . . . . . . : 2001:558:feed::1
2001:558:feed::2
75.75.75.75
75.75.76.76
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : 28-7F-CF-76-31-FC
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter vEthernet (Default Switch):

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter
Physical Address. . . . . . . . . : 00-15-5D-00-7A-48
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::954e:18f:586:89b4%23(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.108.33(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.240
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 385881437
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-25-15-8E-FF-04-D9-F5-22-48-19
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
 
Sep 6, 2020
3
0
20
1
I happened to stumble upon a solution by myself.

What ended up fixing the problem was pressing the reset button on the PC's front panel. After the PC booted back up, speed check showed I had a much more reasonable 260 Mbps bandwidth.

I guess a lesson learned here is try multiple methods of restarting your device, including reset and full power cycle (disconnect power).

Thanks again for the responses!
 

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