* Game Sizes Vary: PSP games come in various sizes, ranging from a few hundred megabytes to over a gigabyte.
* Other Data: The memory card also stores save data, game updates, and other system files, taking up space.
* Memory Card Type: The PSP uses a proprietary memory stick format, and the memory card's speed can influence game performance.
To figure out how many games you can fit, you need to consider:
1. The specific games you want to download: Look up the file sizes of the games you're interested in.
2. Available space: Calculate the free space after accounting for save data and system files.
3. Game compatibility: Ensure the games are compatible with your PSP model.
A 4GB memory card is likely too small for many modern PSP games. You'll probably be able to fit a few smaller games or a single larger game. To play a larger library of games, consider a larger memory card (8GB, 16GB, or more).