To help you i tested several Roms, here are the result:

It's 900MHZ

I disable the sound for all roms.

Mario kart 64 (nice)
California speed (nice)
Super Mario 64 (nice)
WWF War zone (nice)
Top Gear Rally (nice)
Formul 1 World chompionship (nice)
1800 Snowboard (nice, little bug grafique)
Ready Rumble 2 ( to menu graphic bug)
Goldeneye (very slow)
007 The World Is Not Enough (bug graphic, no weapon display)
Destruction derby 64 (very slow, and bug graphic to the menu)
Perfect dark (bug, stop all to the menu)
Re-volte (very very slow)
Spederman 64 (bug graphic)
Residant evile 2 (no launch)
Diddy kong racing (no launch)