Lenovo 40Y7734 1GB PC2-5300 667MHz DDR2 SDRAM SODIMM Memory Compatible with ThinkPad R60, R61, R61e, R61i, SL300, SL400, SL500, T60, T60p, T61, X60, X60s, X60 Tablet, X61, X61s, X61 Tablet, X300, Z60m, Z60t, Z61e, Z61m, and Z61t systems. Capacity: 1 GB Form Factor: SODIMM. Memory speed: 667 MHz. Number of Pins: 200.