4GB (2x2GB)PC5300 667MHz SODIMM Memory Upgrade Compatible with Dell Inspiron 1420, 1520, 1521, 1525, 1720, 1721 Notebook 4GB Kit (2x2GB) DDR2 SODIMM PC2-5300 667Mhz Laptop Memory Compatible with Dell Inspiron 1420, 1520, 1521, 1525, 1720, 1721 Notebook 204 Pins