731125-001 - Battery pack - 4.3V NiMH with 610mm (24 inch) long cable - For use with 4GB cache module - Provides back up power to the flash-based write cache (FBWC) memory module in the event of a system power failure - For use with Smart Array controllers
729639-001 - 4GB flash backed write cache (FBWC) memory module, 72-bit wide - Does not include the controller board or capacitor module - For use with the P420, P421, P430, P431, 822, and 830 Smart Array controllers