4GB KIT (4 x 1GB) For Gateway Media Center Series 835GM 840GM GM5044F GM5046B GM5048 GM5048B GM5066B GM5066E GM5067H GM5091E GM5091H GM5258H GM5259E GM5259H GM5260 GM5266E GM5407E GM5420 GM5424 GT3022B GT3045M GT3216M GT3218M GT3220M GT3222M GT3224M GT3236M GT5012 GT5012B GT5012H GT5014H GT5016H GT5018E GT5020J GT5040 GT5040H GT5048J GT5052B GT5054B GT5056B GT5056J GT5058J GT5062J. DIMM DDR2 NON-ECC PC2-4200 533MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (4 x 1GB) DIMM DDR2 NON-ECC PC2-4200 533MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Gateway Media Center Series. (See Compatibility List Below)