HP Z640

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Technical white paper | HP Z640 Workstation
Memory Congurations and
Optimization
The purpose of this section is to provide an overview of the memory
congurations for the HP Z640 Workstation and to provide recommendations
to optimize performance.
Supported memory modules
Types of memory supported on an HP Z640 are:
• 4 GB, 8 GB and 16 GB PC4-2133R 2133 MHz DDR4 Registered DIMMs
• 32 GB PC4-2133L 2133 MHz DDR4 Load Reduced (LR) DIMMs
– 32 GB LR DIMMs are expected to be available early 2015
• Single and dual rank 4 GB and 8 Gb based RDIMMs are supported
• Quad rank 4 GB based LR DIMMs are supported
Types of memory NOT supported on an HP Z640 are:
• Unbuered DIMMs
• Non-ECC DIMMs
• DDR, DDR2, or DDR3 DIMMs
See Memory Technology White Paper for more memory module technical information.
Platform capabilities
Maximum capacity
• Single processor: 64 GB at launch
– 128 GB when 32 GB LR DIMMs are available
• Dual processors: 128 GB at launch
– 256 GB when 32 GB LR DIMMs are available
Total of 8 memory sockets
• 4 sockets on the motherboard: 4 channels per processor and 1 socket per channel
• 4 sockets on the 2nd CPU and memory module: 4 channels per processor and 1 socket per channel
Speed
• 2133 MHz, 1866 MHz and 1600 MHz memory speeds are supported in this platform.
• Memory will operate at the speed of the slowest rated installed processor or DIMM.
Registered and LR DIMMs cannot be mixed in a system
Dynamic power saving is enabled
NUMA and Non-NUMA modes are supported and user congurable