512MB KIT (2 x 256MB) For Dell Inspiron Notebook Series 2500 2600 4000 4100 5000 7500 8000 8100 C433GT C433GT R450GT R450GT R500GT R500GT R500VT R500VT R500YT R500YT. SO-DIMM SD NON-ECC PC133 133MHz RAM Memory. Genuine A-Tech Brand. 512MB KIT (2 x 256MB) SO-DIMM SD NON-ECC PC133 133MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Inspiron Notebook Series. (See Compatibility List Below)