Features Specifications:IBM SERVER MEMORY- 512MB PC2-4200 533MHZ DIMM 240-PIN CL4 DDR2 SDRAM 30R5121  30R5121 - IBM SERVER MEMORY KIT- 512MB PC2-4200 533MHZ DIMM 240-PIN CL4 DDR2 SDRAM IBM MEMORY FOR THINKCENTRE A51 A51P M51E (30R5121). NEW BULK. IN STOCK. DETAIL PRODUCT DESCRIPTION  BRAND: IBM  FORM FACTOR: DIMM 240-PIN  TECHNOLOGY: DDR2 SDRAM  KEY FEATURES  CAPACITY (DISPLAY): 512 MB  TECHNICAL FEATURES  BUS CLOCK RATE: 533 MHZ / PC2-4200.  CAS LATENCY: CL4  MISCELLANEOUS:  COMPATIBILITY:  THINKCENTRE A51  THINKCENTRE A51P  THINKCENTRE M51E  WARRANTY & SUPPORT  CONDITION : NEW BULK.  AVAILABILITY: IN STOCK.  WARRANTY : 3 years.  KTM3211/512, 30R5121, 73P3213, 73P3214, 73P4971. This Module may be manufactured by Infineon, Micron, TwinMOS, Transcend or Adata depending on availability. This memory is in stock and can ship today. We guaranty this module will work in your motherboard. 512MB 240-pin PC2-4200 DDR2-533 non-ECC non-Registered DIMM. This module must be installed in pairs for dual channel mode.