: Set the value to 2x PSP for crisp textures. Drop it down to 1x PSP on older hardware to fix rendering slowdowns.
: You cannot run the PS2 version of RE4 natively on a PSP. Historically, the only way to see RE4 on a PSP screen was through Remote Play from a PS3. Legitimate Ways to Play Resident Evil on PSP : Set the value to 2x PSP for crisp textures