1GB RAM Memory Upgrade for the Gateway E-4300, E4500D SB, E6500D SB, GM5442 and GM5446E Desktop Systems (DDR2-533, PC2-4200) Guaranteed Compatible for the Gateway E-4300, E4500D SB, E6500D SB, GM5442 and GM5446E Desktop Systems Speed up your system with up to 4.0GB of Memory! Lifetime Replacement Warranty! Will ship the same day when ordered at or before 4pm EST! All others ship next day! Fully-staffed call center to help with installation or inquiries! Call 866-335-1355 with questions or for help!