Keystron HP Q2628A Q7720A 512MB 100pin DDR SDRAM DIMM for HP LaserJet 2410 2420 2420d 2420dn 2430 2430dtn 2430n 2430tn Printer Memory 512MB 100pin DDR printer memory upgrade Part#: Q2628A, Q7720A 100% Compatible with Lifetime Warranty Manufactured by Keystron, LLC Keystron is a registered trademark of Keystron, LLC