HP Q2628A Q7720A 512MB 100 pin DDR SDRAM DIMM for HP LaserJet 4350 4350n 4350tn 4350dtn 4350dtnsl 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