A RAID controller allows your computer to treat an array of drives as a single logical unit, speeding up data storage and providing redundancy in case one drive fails. The HP 659331??001 Smart Array P220i RAID Controller is built to manage 64 SAS-connected drives at 6?Gb/s for your HP ProLiant Blade Server via its high-speed PCI Express?x4 and generous 512MB Flash Backed Write Cache. This HP 659331??001 RAID Controller has been removed from a working unit, tested for complete functionality by our expert in-house HP-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 HP 659331??001 RAID Controllers 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!