This is the most common issue when searching for the keyword. You have a memory card assigned in Slot 1, the game boots, but when you go to "Load Game" in the GoW2 menu, it says "No save data found" .
Why does this matter for memory cards? Because if your emulator crashes during the saving process, you will corrupt the virtual memory card. God of War 2 pushes the EE (Emotion Engine) and VU units to 100%, which can cause timing glitches. god of war 2 pcsx2 save memory card