hi, setting the resolution to 640×480, i can play a lot of games. 🙂
Castlevania - The Dracula X Chronicles, Darius Burst, Dragon Ball Z - Shin Budokai 1 and 2, Neo Geo Heroes - Ultimate Shooting, Nova, Princess Crown, Spectral vs Generation, Tehra - Dark Warrior, Twin Blades, work perfectly.
Other games have some slowdowns, but are playable: 3rd Birthday, The, Crisis Core - Final Fantasy VII, Ikki Tousen - Eloquent Fist, Ikki Tousen - Xross Impact, Street Fighter Alpha 3 MAX, Ghost in the Shell - Stand Alone Complex.
I tested all these games on core libretro and ppsspp.