System

• Motherboard: ASRock B450M-HDV R4.0

• Old CPU: AMD Ryzen 5 2600

• New CPU: AMD Ryzen 5 5600

• GPU: AMD RX 6600

• Wi-Fi Adapter: TP-Link Archer T4E v3

• Driver Version: 2024.10.143.0
  Also, my spelling is not the b​​​​​​est so I used a bit of AI to fix it. Sorry for that.

What Changed

I updated my motherboard BIOS from 3.70 to 4.10 in preparation for upgrading from a Ryzen 5 2600 to a Ryzen 5 5600.

To install the CPU and cooler I had to:

• Remove the GPU

• Install the new CPU

• Install the cooler

• Reinstall the GPU

After the upgrade I noticed my League of Legends EUNE ping increased from a stable 36–38 ms to a stable 52–55 ms.

The strange part is that the connection remains stable. It isn't fluctuating wildly. It just seems consistently higher than before.

Current Windows reports:

SSID: ELTX-2.4GHz_WiFi_C3DC

Protocol:

• Wi-Fi 4 (802.11n)

Band:

• 2.4 GHz

Channel:

• 5

Link Speed:

• 300/300 Mbps

Signal appears stable.

Speed Tests

Download:

• 111.86 Mbps

Upload:

• 98.20 Mbps

Idle Latency:

• 5 ms

Download Latency:

• 136 ms

Upload Latency:

• 74 ms

ISP:

• ST CABLE

• SAT-TRAKT

• Becej, Serbia

Router Settings (2.4 GHz)

Basic Settings

Band: 2.4 GHz (B+G+N)

Mode: AP

Channel Width: 40 MHz

Control Sideband: Upper

Channel: 5

Radio Power: 100%

Regdomain: RUSSIAN(12)

Advanced Settings

Fragment Threshold:

• 2346

RTS Threshold:

• 2347

Beacon Interval:

• 100

Data Rate:

• Auto

Preamble:

• Long

Client Isolation:

• Disabled

Protection:

• Disabled

Aggregation:

• Enabled

Short GI:

• Enabled

TX Beamforming:

• Enabled

MU-MIMO:

• Disabled

Multicast to Unicast:

• Enabled

Band Steering:

• Disabled

WMM:

• Enabled

802.11k:

• Enabled

802.11v:

Enabled

Archer T4E Advanced Device Manager Settings

802.11b:

• Enabled

Beacon Interval:

• 100

Current Operation Preference:

• Disabled

MAC Randomization:

• Disabled

Multi-Channel Concurrent:

• Disabled

Preamble Mode:

• Long Only

PreferBandRSSIThreshold:

• 25

Preferred Band:

• 2.4 GHz First

Wake On Magic Packet:

• Disabled

Wake On Pattern Match:

• Disabled

Wireless Mode:

• IEEE 802.11 b/g/n

Other Things I Noticed

• One Wi-Fi disconnect occurred while playing Dark Souls 3.

• During that event the game stuttered and audio froze briefly.

• Windows then asked for the Wi-Fi password again on the 2.4 GHz network.

• 5 GHz continued to work.

I also tested the Archer T4E antennas and both appear functional.

I previously used a Tenda USB Wi-Fi adapter before installing the Archer T4E. Some old Tenda drivers may still exist on the system.

Main Questions

Can a BIOS update or CPU swap realistically affect networking in a way that causes a stable ping increase without obvious packet loss?

Could removing and reinstalling the GPU during the CPU upgrade have affected the PCIe Wi-Fi card somehow?

Does anything in my traceroute indicate a routing change between my ISP and Riot?

Is there any reason to suspect a motherboard issue, PCIe issue, or Archer T4E issue?

Has anyone seen League of Legends EUNE routing change recently causing an increase from ~38 ms to ~52 ms?

Additional Testing Performed

Before suggesting basic Wi-Fi optimizations, please note I already tested the following extensively:

Archer T4E Device Manager Tests

• Changed Wireless Mode from IEEE 802.11 b/g/n to:

  • IEEE 802.11b only

  • IEEE 802.11b/g

• No change in League of Legends ping (remained ~52–55 ms).

Router Tests

• Changed Channel Width from 40 MHz to 20 MHz.

• Changed Channel Number to 1.

• Tested multiple other channels as well.

• These settings sometimes improved stability or reduced spikes, but did not reduce the actual average ping, which remained around 52–55 ms.

Important Observation

• Regardless of router channel, channel width, or Archer T4E wireless mode settings, the ping remains consistently around 52–55 ms.

• The issue is not random spikes or packet loss; it is a stable increase compared to the previous stable 36–38 ms before the BIOS update and CPU swap.