IBM 23R9009 2GB DDR-400MHz CL 2.5 184-pin DIMM memory module designed for legacy IBM and compatible x86 servers from the early-to-mid 2000s era. Operates at 400MHz with CAS latency 2.5, delivering sustained bandwidth suitable for enterprise workloads on single and dual-socket platforms. The 184-pin form factor is specific to DDR (not DDR2/DDR3) and requires matching chipset support—verify compatibility with your target system before purchase. Typical applications include memory upgrades for IBM xSeries servers, StorageSystems, and OEM systems that shipped with DDR-400 support. Each module is tested and guaranteed compatible; available via quote.