4MB RAM Cartridge for Sega Saturn Power Memory for Sega Saturn A set. Expansion RAM is essential for improving game performance. Power Memory is installed in the top slot for saving game data. It's convenient for covering the lack of capacity on the game console and for carrying data, with a capacity of 4Mbit (512KB). The expansion RAM has not been tested for operation as there is no compatible software. The Power Memory has been tested and confirmed to be working. Game data remains, so please erase it yourself. Both have fine scratches due to aging. We do not offer separate sales. Please purchase only if you agree with the above. Immediate purchase is OK. Thank you for viewing.