256MB DDR2 144pin x16 bit Ram memory upgrade for HP LaserJet printers. Compatible with HP LaserJet CM2320fxi, CM2320nf, Color LaserJet CM2320, CP1510, CP2025ndn, CP2025nX, CP1515n, CP1518ni, CP1525nw, CP2025dn, CP2025n, CP2025x, CP5225dn, Laserjet 3005N, P2055, M2727nf, P2015, P2015D, P2015DN, P2015N, P2015X, P2035n (CE462A), P2055D, P2055DN, P2055X, P3005 (Q7812A), P3005D (Q7813A), P3005DN (Q7815A), P3005N (Q7814A), P3005X (Q7816A).