A-TECH 1GB KIT (2 X 512MB) For Sony VAIO VGN VGN-FS625 VGN-FS625B/W VGN-FS630 VGN-FS630/W VGN-FS630F VGN-FS635 VGN-FS635B/W VGN-FS640. SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory. Genuine Brand. 1GB KIT (2 x 512MB) SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Sony VAIO VGN. (See Compatibility List Below)