Nintendo 64 Expansion Pak 4MB
No it does not save. Legend of Zelda Majoras Mask, Donkey Kong 64, and Perfect Dark require this expansion pak in order to play on the N64. It also improves some textures/graphics on some other games.
Yes the expansion pak will work with Donkey Kong 64. It fixes a game breaking issue where the game would regularly crash without the 8MB expansion pak.
This device adds an extra 4Mb of ram to the already available 4 Mb inside the system for a total of 8 Mb of ram. It is required to play games such as Donkey Kong 64, Majora's Mask, and Perfect Dark (single player). In other games it allows them to have semi better graphics but frame rate does suffer. Is it essential, yes. I hope this helps with your question.
It did fit , but unfortunately it didn’t work.
Yes, it is a Nintendo brand expansion pak