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Technical white paper | HP Z640 Workstation
Memory Configurations and
Optimization
The purpose of this section is to provide an overview of the memory
configurations 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:
• Unbuffered 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 configurable
