As I posted above, here are my overclock settings. 1000 mghz was not enough for the games to run smoothly for me. I kissed my warranty goodbye to get PSP to run well enough.
gpu_mem_256=128 gpu_mem_512=256 gpu_mem_1024=384 gpu_mem=384 arm_freq=1100 core_freq=550 sdram_freq=500 over_voltage=4 force_turbo=1 avoid_pwm_pll=1 v3d_freq=450
It’s worth noting that I did my homework before applying these:
There is another thread I used for reference on the pi forums as well, but I don’t have that link. I didn’t use anything that was reported to be unstable by any other users.