This is a ValueRAM's 256M x 72-bit 2GB (2048MB) DDR2-400 CL3 SDRAM (Synchronous DRAM) "dual rank" registered ECC "Intel Certified" memory module.The components on this module include eighteen 128M x 8-bit (64M x 8-bit x 4 Bank) DDR2-400 SDRAM in FBGA packages. This 240-pin DIMM uses gold contact fingers and requires +1.8V.