This 24GB RAM is 100% compatible with the HP ENVY All-in-One 27-cp0950nz.

Information on memory configuration: The following technical specifications should be considered in advance: The device can have non-ECC or ECC (Error-Correction-Code) RAM installed. Modules labeled as ECC have error correction. Non-ECC memory modules cannot be mixed with ECC memory. If a memory upgrade is to be made with the existing RAM, it must be checked which memory technology (non-ECC / ECC) is present. The device supports non-ECC SO-DIMM or ECC SO-DIMM. Memory modules with the ECC designation have error correction. Non-ECC memory modules cannot be mixed with ECC memory. If a memory upgrade is to be made with the existing memory, it must be checked which memory technology (non-ECC / ECC) is present.