1GB DDR2 Memory Upgrade 4 Toshiba Satellite A135-S4407, A135-S4417, A135-S4427, A135-S4437, A135-S4447, A135-S4457, A135-S4467, A135-S4477, A135-S4478, A135-S4487, A135-S4488, A135-S4498 Technology: DDR2 SDRAM DENSITY: 1GB PIN COUNT: 200-pin Speed: PC2-4200 533MHz CL: CL=4