2GB 200-pin DDR2 SDRAM SO-DIMM Memory Module, 533MHz (PC2-4200), 1.8V, 256MX64, CL 4 ...This module is JEDEC-standard 200-pin, small-outline, dual in-line memory module. A 256 byte serial EEPROM on board can be used to store module information such as timing, configuration, density, etc. This memory module is 2GByte and organized as a 256MX64 array using (16) 128MX8 (4 internal banks) DDR2 SDRAMs in BGA packages. All memory modules are fabricated using the latest technology design, six-layer printed circuit board substrate construction with low ESR decoupling capacitors on-board for high reliability and low noise.