A-TECH 512MB KIT (2 x 256MB) For Dell Inspiron 2500 2600 3700 3800 4000 4100 5000 7500 8000 8100. SO-DIMM SD NON-ECC PC133 133MHZ RAM Memory. Genuine 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. (See Compatibility List Below)