A backplane is a board that adds new connectors (for memory, storage, additional processing, etc.) to an existing configuration. They are often used to save space, or to provide a more reliable connection than a cable. The IBM 74Y5031 Media Backplane is built to provide six SAS storage drive slots for your IBM POWER 770 (9117??MMB). This IBM 74Y5031 Media Backplane has been removed from a working unit, tested for complete functionality by our expert in-house IBM-Certified Technician, and is ready to ship today! Purchase with confidence, as the photos above represent the exact quality of your items, and come bundled with our 90 Day Warranty. *Please note, we have additional IBM 74Y5031 Media Backplanes in stock; feel free to send a message and we will update the quantity to suit your specific needs.* Thank you for choosing AltaTech for all of your lightning-fast IT needs!