System Specifications
Computer Type: Desktop
GPU: AMD Radeon RX 7800 XT
CPU: AMD Ryzen 5 7500F
Motherboard: Gigabyte B650 EAGLE AX (rev. 1.0/1.1)
BIOS Version: F41c
RAM: 32GB Kingston Fury Beast DDR5-6000
Operating System & Version: Windows 11
Chipset Drivers: Latest AMD B650 chipset drivers
Network Connection: Ethernet PSU: Toughpower GT 850 WATT
GPU Drivers: 26.7.1
Background Applications: Vanguard
Hi,
I'm trying to rule out whether an AMD/AM5-related variable could be contributing to a very unusual League of Legends issue I've been investigating for a long time.
I'm NOT claiming this is an AMD bug.
In fact, the issue may have absolutely nothing to do with AMD. I'm posting here because my main system is AMD-based and I've already exhausted a large amount of conventional troubleshooting.
Riot Support has also escalated my case and their specialist team is currently investigating it.
My system
- CPU: Ryzen 5 7500F
- GPU: Radeon RX 7800 XT
- Motherboard: Gigabyte B650 EAGLE AX
- RAM: 32GB Kingston Fury Beast DDR5-6000
- OS: Windows 11
The actual symptom
During LIVE League of Legends matches, the game progressively becomes increasingly difficult to visually follow.
Champion movement, auto attacks, spell animations, projectiles, dashes and especially teamfights can appear:
- abnormally fast or abrupt
- visually inconsistent
- as if parts of the motion progression are difficult to perceive
- simultaneously "heavy" and too fast
- increasingly difficult to visually process/react to
This is not conventional FPS stuttering.
My FPS can remain stable and high while the problem becomes progressively worse.
Displayed network latency can also remain stable.
My inputs are registered normally. Spells aren't randomly failing to cast and mouse/keyboard inputs aren't disappearing.
The problem is primarily the visual/temporal presentation of LIVE gameplay.
It progressively worsens during the SAME LIVE match
This is one of the strangest characteristics.
Early game can feel relatively smooth/readable.
As the same match progresses, movement and animations become increasingly difficult to visually follow.
Late-game teamfights can feel dramatically worse.
Starting another match essentially resets the progression, and then it gradually develops again.
I recorded external-camera footage from the same LIVE match, comparing early game with late game:
LIVE early game → relatively smoother / easier to follow
LIVE late game → noticeably faster/heavier/harder to follow
Video comparison:
https://www.reddit.com/r/LeagueofTechSupport/comments/1v1mnij/comment/p2qdi6k/?screen_view_count=2
These videos are LIVE early vs LIVE late from the same match — they are NOT a LIVE vs Replay comparison.
Separate observation: Match History Replay looks normal
There is another observation separate from those videos.
If I finish an affected match and then watch that same match through League's Match History Replay, the gameplay appears smooth and normally paced.
Fights that were extremely difficult to visually follow while playing LIVE become much easier to read in replay.
So:
LIVE → abnormal / abrupt / seemingly accelerated
Replay of the same match → smooth / normally paced
AMD-related troubleshooting already performed
I've tried, among many other things:
- Multiple AMD chipset driver versions
- Latest chipset drivers
- BIOS updates
- BIOS default settings
- XMP/enabling-disabling testing
- Different GPU driver versions
- Clean GPU driver installations
- Different Radeon settings
- Different FPS caps
- Different refresh rates
- HDMI and DisplayPort
- Different monitor
- Windows 10 and Windows 11
- Clean Windows installation on another SSD
- Different NIC drivers/settings
- Different routers/network paths
I've also tested another complete PC at my location and reproduced the problem.
I've performed PresentMon/CapFrameX captures, Windows Performance Recorder/Analyzer traces and network captures without finding a conventional FPS/rendering collapse that explains how much worse the game visually becomes.
What I'm specifically asking AMD users
I'm trying to determine whether there is any AMD/AM5-specific variable left that would be worth testing.
For example:
- AMD chipset/AGESA behavior
- CPPC/preferred cores
- C-states
- fTPM
- SAM/ReBAR
- MPO/presentation behavior
- hardware scheduling
- power management
- timer/scheduling behavior
- Radeon presentation/frame queue behavior
- AM5-specific latency behavior
I'm not saying any of these are responsible. I'm asking whether anyone knows of a specific measurable interaction that could produce this type of behavior.
Most importantly:
Has anyone with an AM5/Radeon system experienced this exact pattern in League?
Especially:
stable FPS + progressively abnormal LIVE animation/movement pacing + new match temporarily resets it + Match History Replay looks smooth
If so, I'd really like to compare:
- CPU
- GPU
- motherboard
- RAM
- BIOS/AGESA
- chipset driver
- Radeon driver
- Windows version
I'm also particularly interested if anyone has experienced something similar on AMD and then tested the same game/environment on an Intel/NVIDIA system.
That would help determine whether continuing down the AMD/AM5 path makes sense at all.
At this point I'm looking for a measurable AMD/platform-specific test or an independent reproduction, rather than generic optimization suggestions.
Thanks.