Bios tweaks are not essential, but good for some emus like dolphin. About games, some.modern games work ok too, It depends how well are optimized. For example I am playing recent titles like umvsc3 fullspeed, or i am setsuna or caladrius blaze. It depends on how well games are optimized. Modern indie titles are playable Too most of them, and games from the ps3/360 era are very playable. I am playing for instance tales of berseria and runs at solid 30fps with 960x544 resolution. In terms of emulation, the biggest difference regarding gpd xd is mame, which is much faster on Windows, and dolphin. Pcsx2 is pretty unplayable in most titles and ppsspp is better, but not fullspeed in all games. My shield TV for xsmple runs ppsspp much better. Other emus like n64 are fine using project64, for dc use nulldc, and for Saturn ssf. For psx epsxe like in Android and for 8/16 bit I use retroarch.