If your eFootball PES 2021 crashes right after launching on an Intel 12th Generation or newer processor, you’re not alone. This problem is common on newer CPUs because of the way Intel handles Performance-cores (P-cores) and Efficient-cores (E-cores).
In this guide, I’ll show you why this happens and exactly how to fix it in just a few minutes.
Why PES 2021 Crashes on Intel 12th Gen and Newer
Starting with Intel’s 12th Gen “Alder Lake” CPUs, the architecture combines P-cores (for high performance) and E-cores (for efficiency).
Older games like PES 2021 are not optimized to run on this hybrid architecture. When the game tries to use both core types, it can cause instability or immediate crashing.
Step 1 – Check Your CPU in Task Manager
- Right-click on the taskbar → choose Task Manager.
- Go to the Performance tab → select CPU.
- Look for the CPU name you are using (example: Intel Core i7-13650HX). We will use this name to search on Intel’s website in the next step.
Step 2 – Find “Total Threads” and “# of Efficient-cores”
Go to Intel’s official website and search for your CPU model: https://www.intel.com
On your CPU’s specification page, find these two values:
- Total Threads
- # of Efficient-cores
Step 3 – Calculate the Hex Affinity Code
We need to run PES 2021 on P-cores only. To do this, follow these steps:
- Subtract: Total Threads – # of Efficient-cores = Number of cores to use. (example: 20-8=12)
- Open Windows Calculator → switch to Programmer mode.
- Select BIN (Binary).
- Enter “1” for each core you want to use (example: for 12 cores, type
1111 1111 1111). - The calculator will automatically show the HEX value (example:
FFF). - This HEX value is what you will use for
/affinityin the BAT file.
Step 4 – Create the BAT File
Open Notepad and paste the following code (replace FFF with your own HEX code from Step 3, and replace the path to your game folder):
@echo off
cd /d "C:\Program Files (x86)\eFootball PES 2021"
start "" /affinity FFF PES2021.exeSave the file as PES2021_start.bat (choose “All Files” in the “Save as type” dropdown) and double-click to launch the game.
Step 5 – Test the Game
Run the .bat file you just created. If everything is set correctly, PES 2021 will now launch and run without crashing.
Conclusion
By limiting PES 2021 to use only P-cores, we avoid the conflict between Intel’s P-cores and E-cores, eliminating the crash issue on newer CPUs.
Quick recap:
- Check your CPU info in Task Manager
- Find Total Threads and # of Efficient-cores on Intel’s site
- Calculate HEX code using Windows Calculator (Programmer mode)
- Create and run a
.batfile with your HEX affinity
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