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SUPPORT COMMUNICATION- CUSTOMER ADVISORY

Document ID: c04471641

Version: 1

Advisory: HP Z640/Z840 Workstation - May Have Performance Degradation with Specific Processor

Notice:: The information in this document, including products and software versions, is current as of the release date.The document is subject to change without notice.

Release date : 03-Oct-2014

Last updated : 03-Oct-2014

DESCRIPTION
If an HP Z640 or Z840 workstation is configured with Dual E5-2699v3 processors and Hyper-Threading enabled, as described in the SCOPE section, some Windows ISV software will have reduced performance.

SCOPE
Information in this document applies to the following:
Systems:
  • HP Z640 Workstation
  • HP Z840 Workstation
Operating Systems:
  • Microsoft Windows 7 Professional (64-bit)
  • Microsoft Windows 8.1 Pro
Parts:
  • 780016-001 : IC uP HSW E5-2699v3 18C 2.3GHz 145W
System BIOS:
  • Hyper-Threading is enabled
RESOLUTION
An E5-2699v3 dual processor system with HT enabled has 72 logical processors. This can be an issue for applications that use legacy Windows OS APIs that don't support more than 64 logical processors.
To workaround or resolve this issue, please perform one of the following methods.
1. Modify Application to use updated Windows OS APIs that support more than 64 logical processors. Additional information on updated APIs and application modifications required to support greater than 64 logical processors can be found in the following Microsoft article. ( http://msdn.microsoft.com/en-us/library/windows/hardware/dn653313(v=vs.85).aspx).
2. Disable Hyper-Threading in the System BIOS Setup so that there are less than 64 logical processors in the system.

Hardware platforms affected : HP Z640 Workstation, HP Z840 Workstation

Operating systems affected : Microsoft Windows 7 Professional (64-bit) (deleted)

Software affected : Not applicable

Support Communication Cross Reference ID : IA04471641

HP Inc. shall not be liable for technical or editorial errors or omissions contained herein.The information provided is provided "as is" without warranty of any kind.To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental, special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration.The information in this document is subject to change without notice.HP Inc. and the names of HP products referenced herein are trademarks of HP Inc. in the United States and other countries.Other product and company names mentioned herein may be trademarks of their respective owners.

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