Why would there be a maximum on the amount of RAM in the system? That's silly 
Indeed, the whole ROM is not loaded into RAM. There is however one feature that requires you to have enough RAM to fit the input data: custom texture prefetching. But I would assume that custom textures are something you're fine with skipping if you're trying to get Dolphin running on a low-end system.
Indeed, the whole ROM is not loaded into RAM. There is however one feature that requires you to have enough RAM to fit the input data: custom texture prefetching. But I would assume that custom textures are something you're fine with skipping if you're trying to get Dolphin running on a low-end system.