4GB PC3-10600 ECC HP-COMPAQ Z400 Workstation memory
HP-COMPAQ Workstation memory expansion
HP-COMPAQ Z400 Workstation
Speicherinfo:
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Important information about your system memory (RAM)
Your system supports only memory modules with selected memory chips. If you think you have found a store for a lower price elsewhere, then it is possible that the cheaper memory chip will not work.
or you get your money back!