HP Z640

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Technical white paper | HP Z640 Workstation
Memory features
ECC is supported on all of our supported DIMMs
• Single-bit errors are automatically corrected.
• Multi-bit errors are detected and will cause the system to immediately reboot and halt with an F1 prompt error message.
• Non-ECC memory does not detect or correct single-bit or multi-bit errors which can cause instability, or corruption of
data, in the platform. See Memory Technology White Paper for more information.
Command and Address parity is supported
• Command and Address errors are detected and will cause the system to immediately reboot and halt with an F1 prompt
error message.
Optimize performance
Generally, maximum memory performance is achieved by evenly distributing total desired memory capacity across all
operational channels. Proper individual DIMM capacity selection is essential to maximizing performance. On the second
CPU, installing the same amount of memory as the rst CPU will optimize performance. Refer to Optimal congurations
tables below for more information.
Table 4: Optimal congurations for HP Z640 (Note: The following tables do not include all available orderable congurations)
Notes DIMM1 CPU0 DIMM3 DIMM6 DIMM8 Rating
4 GB * 4 GB Fair
8 GB 4 GB
8 GB
4 GB Good
Fair
12 GB 4GB 4GB 4GB Better
16 GB 4 GB
8 GB
4 GB 4 GB 4 GB
8 GB
Best
Good
24 GB ~ 8 GB 4 GB 4 GB 8 GB Better
32 GB 8 GB
16 GB
8 GB 8 GB 8 GB
16 GB
Best
Good
48 GB ~ 16 GB 8 GB 8 GB 16 GB Better
64 GB 16 GB
32 GB
16 GB 16 GB 16 GB
32 GB
Best
Good
128 GB 32 GB 32 GB 32 GB 32 GB Best
Table 5:
CPU0 CPU1
Notes DIMM1 CPU0 DIMM3 DIMM6 DIMM8 DIMM1 CPU1 DIMM3 DIMM6 DIMM8 Rating
8 GB 4 GB 4 GB Fair
16 GB 4 GB
8 GB
4 GB 4 GB
8 GB
4 GB Good
Fair
32 GB 4GB
8 GB
16 GB
4GB 4 GB 4GB
8 GB
4 GB
8 GB
16 GB
4 GB 4 GB 4 GB
8 GB
Best
Good
Fair
48 GB 8 GB 4 GB 4 GB 8 GB 8 GB 4 GB 4 GB 8 GB Better
64 GB ~ 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB Best
96 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB Better
128 GB ~ 16 GB
32 GB
16 GB 16 GB 16 GB
32 GB
16 GB
32 GB
16 GB 16 GB 16 GB
32 GB
Best
Good
256 GB 32 GB 32 GB 32 GB 32 GB 32 GB 32 GB 32 GB 32 GB Best
* Maximum memory capacities assume Windows 64-bit operating systems or Linux. With Windows 32-bit operating systems, memory above 3 GB may
not all be available due to system resource requirements.
~ Although supported, these congurations are not orderable at this time.