4GB STICK For Dell Studio Notebook Series 1537 1555 (DDR2) 1737 (8GB Max). SO-DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 4GB STICK SO-DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Studio Notebook Series. (See Compatibility List Below)