Z840 HP: HP Z840 CPU

Pending an answer to my question of cooling liquid, I will ask another question.

The line processor Xeon E5 is the fastest CPU listed for the Z840. It looks like a Xeon E7-8891 is faster and I wonder if it might be available in the Z840 in the near future? Any plans for a Xeon E7 for the Z840?

GTWatson77459 wrote:

"With my situation in mind, what would be the best compromise of clock speed and the number of cores of the Z840?

It's an interesting question.  The short answer is that it is application specific, but it is difficult to determine how to balance carrots vs. frequency for each application.  I don't really know the answer, but there are several variables to consider.

The Z840 supports 3.5 GHz 4 core 2.3 GHz 18 of the CPU core.  Intel numbers according to their idea of relative performance processors, i.e., E5-2699 is the 'up' and the E5-2603 to 1.6 GHz and 6 hearts is the lowest.  HP QuickSpecs Z840 are here.   This gives a rough idea of the relative performance.

Some points of reference, such as those on cpubenchmark.net, have higher ratings for processors with the majority of souls.  It's a way to rate CPU.  But we know as high-frequency players less lower cores.  The Z840 offers the processor 3.1 GHz 10 E5-2687W, which is a CPU high power (160W) Workstation only.  This could be the sweet spot, but don't take my word for it that it will be the best for your application.

A little off-topic technical discussion:

Frequency rated core from Intel is the guaranteed minimum of frequency.  All processors have the Turbo Boost technology, which increases the base frequencies by steps of 100 MHz.  CPUs are given numbers for turbo steps maximum 'all basic' and 'carrot' turbo maximum steps.  For example, the E5-2699 is only 2.3 GHz, but can stimulate all the hearts in 5 steps and a carrot in 13 stages, under certain conditions.

Intel found that the maximum power of the CPU is limited by the temperature of die.  Too hot, and the industry may be damaged (in fact it is thermally first throttle) so Intel limited the power being dissipated.  (Each processor has a rated output of Groove).  Die temperature corresponds to the use of the power of the CPU.  Use your analogy (of cleaning units = pressure x Volume) pressure washer, similarly, CPU power dissipation is a function of: [frequency of the processor (higher freq = more power used), the number of active nuclei and the load on each core].  The idea is to run the CPU at a high level of power for maximum performance, so the frequency of the hearts will vary depending on the load.

If the system uses only 1 core, temperature of die will get too hot, if there is an another carrots 15 just sitting there.  In this case, Intel will increase the active base of several steps of 100 MHz frequency.  10 stages = 1 GHz, so what rated 2.3 GHz CPU could run to 3.3 GHz for a short period.  If all hearts work 100%, the hottest of, so the frequency of operation may be limited to the nominal value.  The frequency may change the order of milliseconds, if I remember correctly.

Another mechanical analogy, it is that of a car with a redline 6000.  Maximum power (= performance) is then carried out to redline, even, the CPU performance maximum occurs at the maximum temperature limit.  If the CPU can run at up to x Watts, why not increase the frequency when he's not stressed?

It is a simplification, but tries to explain the operation of the CPU.  Sometimes people post in the forums that their CPU temp is high, and they are worried about it.  As long as the temperature is lower than the maximum junction temperature Tj max, it's OK.  (Running coretemp program displays Tj max and the base time, FYI).  If the system is working properly, with the correct heater and the circulation of air, it runs the warmer is a sign to get the best performance from the system.  Running a car to redline makes it go faster, but it heats up.  ;-)

BTW, in the same way, if the CPU usage is very low, the frequency of the processor will drop a lot of steps, sometimes a GHz or more.  This is done to save overall system power when the processors don't make much.  Run an active program of CPU frequency will show bounce everywhere.

The UC E5-2687W is the only supported processor 160W.  Intel suggests that it's the highest "balance" CPU because it has a relatively high frequency of 3.1 GHz to 10 cores and has more thermal height.  But even once, do not take my word for it that it is better for your application.

HP found that some programs do not recognize more than 64 hearts, so 2 x 18 E5-2699 processors cores with hyperthreading, will use only 64 out of 88 cores available (with active Hyperthreading).  Just another complication.  FOR INFO.

Sorry for the long post, but I hope that some of it is useful.

Tags: HP Desktops

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    MacBook Pro (retina, mid-2012)

    [Data sheet] - [User Guide] - [warranty & Service]

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    Video information: ⓘ

    Graphics Intel HD 4000

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    Color LCD 3840 x 2400

    LED Cinema Display 2560 x 1440

    Thunderbolt Display 2560 x 1440

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    macOS Sierra 10.12 (A 16, 323) - since the start time: about an hour

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    APPLE SSD SM512E Disk0: (500,28 GB) (Solid State - TRIM: Yes)

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    Apple Inc. FaceTime HD camera (built-in)

    Apple Inc. Apple keyboard / Trackpad

    Apple Inc. BRCM20702 hub.

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    Apple Inc. Apple LED Cinema Display

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    FlashPlayer - 10.6: 23.0.0.162 - SDK 10.9 (2016-09-15) [Support]

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    WebEx64: SDK-1.0-10.10 (2016-01-23) [Support]

    Safari extensions: ⓘ

    Ghostery - GHOSTERY, Inc. - https://www.ghostery.com/ (2016-03-15)

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    Backblaze backup (2016-07-11) [Support]

    Flash Player (2016-08-29) [Support]

    FUSE for OS X (OSXFUSE) (2013-11-30) [Support]

    Java (2016-08-18) [Support]

    MagicPrefs (2016-01-20) [Support]

    MenuMeters (2014-10-22) [Support]

    TiVo Desktop (2009-11-23) [Support]

    Time Machine: ⓘ

    Skip system files: No.

    Mobile backups: OFF

    Automatic backup: YES

    Volumes to back up:

    Boromir: Disc size: 499,05 GB disc used: 358,81 GB

    Destinations:

    Frodo Time Machine [Local]

    Total size: 999,86 GB

    Total number of backups: 40

    An older backup: 09/09/16, 02:09

    Last backup: 25/09/16, 11:49

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    Top of page process CPU: ⓘ

    345% kernel_task

    56% Information System

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    Top of page process of memory: ⓘ

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    1.18 GB com.apple.WebKit.WebContent (6)

    786 MB mds_stores

    590 MB bztransmit

    Mdworker (18) 492 MB

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    256 MB of free RAM

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    768 KB used Swap

    Diagnostic information: ⓘ

    25 sep, 2016, ~/Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2016-09-25-134618_ 13:46:18 [redacted] .crash

    System/Library/Frameworks/WebKit.Framework/versions/A/XPCServices/com. Apple.We bKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent

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    • PhotoAnalysis
    • Process associated with Sophos (this is a commercial application of the antivirus that I need to have on my computer by work/school)

    Things, I tried, without permanent success:

    • Reset my keychain - what causes a detective of other problems leading to -.
    • Restore my computer from a time Machine to the top
    • Remove all 3 Google calendars I've linked
    • Removal of caches

    Ideas? I'm a student, so he is facing the embarrassment of fans screaming out of control... or my wrists while in the middle of burning class. I just noticed that running my MBP with an external screen made it to calm down but the process still zip to the top intermittently.

    Crazy to believe, but the deactivation of reminders iCloud did the trick...

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