This 4GB RAM is 100% compatible with the Lenovo ThinkStation D30 (4353). Information regarding memory configuration: The following technical specifications should be considered in advance: ECC DIMM (with Error-Correction-Code) or RDIMM (Registered DIMM) RAM can be installed in the device. RDIMM memory is recommended when large memory capacities are to be achieved. The different memory technologies (ECC / RDIMM) must not be mixed. If a memory expansion is to be performed with the existing RAM, it must be checked which memory technology (ECC / RDIMM) is present. Memory slots without a processor must not be populated. A higher memory clock of the memory module automatically adjusts to the memory clock set by the system. This can especially be the case with larger capacities.