E5-2696 V2 CPUs for $325!

Discussion in 'Great Deals' started by abq, Aug 18, 2017.

  1. BackupProphet

    BackupProphet Well-Known Member

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    Finally received my two 2696 v2 today! Both worked great on my Supermicro x9dri-ln4f. Idle power with two cpus is 85 Watt, full load with AVX is 400 watt.
     
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  2. wildpig1234

    wildpig1234 Well-Known Member

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    Nice! guess you are ready for some 1950x equalizing performance. btw are you running win10 with that SM MB? if you are. no random lock up? does your MB support S3 sleep mode?
     
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  3. MBastian

    MBastian Member

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    I am still unsure if I should upgrade from my current E5-2670 setup. The E5-2696v2 seems nice but so is the E5-2667v2. The question is if I really need to maximize cores or go for GHz. I whipped up a small plot to help me decide. I am not entirely satisfied with it, but hey - it's 02:20 am

    v2comp.png
     
    #223
  4. wildpig1234

    wildpig1234 Well-Known Member

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    No one around here buy xeon to do things less than at least 8-12 cores.... if you want an all around cpu at best price performance, 1950x is the way to go. if you want cheapest multithread/$. 2696v2 it is
     
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  5. LukeP

    LukeP Member

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    usually. but i buy them for the RAM capacity. if i can get 512GB ram and a 6GHz 4 core I would be happy.
     
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  6. wildpig1234

    wildpig1234 Well-Known Member

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    right. limited ram capacity for TR is definitely another thing limiting them in WS...
     
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  7. BackupProphet

    BackupProphet Well-Known Member

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    I've only tried FreeBSD so far. Performance is just sick. Today I will try the new release of PostgreSQL 10 on a 10TB dataset. Still though, I'm really busy with other things the coming days so it may take a few days before I have some feedback.
     
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  8. fossxplorer

    fossxplorer Active Member

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    OMG! I though i was dealing with some kind of big dataset of ~100GB on my MariaDB instances. But 10 freaking TB...:eek:
    How do you or Postgres handle memory for this sizes of DB? (I know 0 about Postgres).

     
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  9. BackupProphet

    BackupProphet Well-Known Member

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    Im gonna give PostgreSQL around 32 GB of ram of 128GB, the rest is being cached through ZFS ARC, with FreeBSD 11.1, you also have ARC compression which helps A LOT, I'm also careful with my index strategy so I can fit most of hot the indexes in ram and don't have to go my SSD's too often. Ive picked up a lot of 800GB Micron SSD's for under $200 recently :D
     
    #229
  10. Davewolfs

    Davewolfs Active Member

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    Mixed workloads are what workstations are all about.

    Intel is taking so much time with their W Xeons by the time they are released the next kid on the block will be right around the corner.

    The new 8th gen chips seem to have a good speed boost.
     
    #230
  11. MBastian

    MBastian Member

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    I'd consider that but DDR4 prices are insane. For myself I want a good blend of single and multi-thread performance for my personal workstation. V2 prices are still way to high for my taste, so I'll take my time. All I want is another 1-2 years out of my current setup.

    I am just counting GHz here and also omit the small IPC boost from v1 to v2.
    v2comp.png
     
    #231
    Last edited: Oct 6, 2017
  12. Davewolfs

    Davewolfs Active Member

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    You can probably get $200 for 2x2670s. So under $400 all in for the boost. Not bad really. Basically 25% bump in perf over 2670.

    If using all cores expect another 15% for the 2690 and another 15% for the 2696.

    Eg Cinebench scores will be ~ 2500, 2800, 3100.
     
    #232
  13. Davewolfs

    Davewolfs Active Member

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    Just took a look at an invoice for the last DDR4 stick I bought. 32GB for $169. They have gone up in price significantly.
     
    #233
  14. MBastian

    MBastian Member

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    I've read some review (cant't remember from which source) that v1 to v2 has aprox 5-10% IPC boost, depending on the task. But I am still unsure if just adding up the max-turbo#cores clock is the the right thing to do.


    v1comp.png
     
    #234
  15. BackupProphet

    BackupProphet Well-Known Member

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    v2 is a lot more power efficient, you should consider that too! I think 2650 v2 is a good deal today, I've seen them for $100 a few times
     
    #235
  16. BackupProphet

    BackupProphet Well-Known Member

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    Running benchmarks is hard when almost every system I have overheat :(

    On Ubuntu run the following
    Code:
    sudo apt install python-numpy libopenblas-base
    
    Then try running the following python code
    Code:
    import timeit
    import numpy as np
    size = 300
    a = np.random.random_sample((size,size))
    b = np.random.random_sample((size,size))
    
    def dot_matrix():
        np.dot(a,b)
    
    if __name__ == '__main__':
        print(timeit.timeit("dot_matrix()", setup="from __main__ import dot_matrix"))
    
    
    Watch your temperature....

    With dual 2696 v2 I got 641.057282925 (lower is better) with some slight thermal throttling.
    My workstation with i6700K just rebooted every time I ran this benchmark. Will try it on my Haswell gaming pc when I come home.
     
    #236
  17. BackupProphet

    BackupProphet Well-Known Member

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    Okey, my Haswell only spent 494 seconds, with 1/6 of the cores. Now I'm disappointed. Though this may be the result of having AVX2.
     
    #237
  18. MBastian

    MBastian Member

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    Got no time to verify, but are you sure the script was running mulithreaded? (Edit: And if yes, on all available cores?)
     
    #238
    Last edited: Oct 9, 2017
  19. BackupProphet

    BackupProphet Well-Known Member

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    It seems like numpy doesn't like too many threads, it scales almost linear up to 8 cores, then it only gets like 20% faster with 16 cores, and from there it gets "slower".

    I have the same problem with PostgreSQL, parallel queries scales linear up to 8 cores, about 20% faster with 12 cores, and from there it just get slower.
    So there is definitively a lot of applications that scales badly with too many cores.

    Other workloads where each thread has a independent task scales a lot better.
     
    #239
  20. BackupProphet

    BackupProphet Well-Known Member

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    I have another interesting update about these cpu's

    Turbo boost works up to 3.5Ghz, but it is not stable there even with one active core, it jumps between 3.3Ghz and 3.4Ghz with some spikes up to 3.5Ghz. When all cores are active and no AVX instructions are in use, the speed is stable at 3.1Ghz. With AVX, speed is stable at 2.7Ghz, but if it gets too hot, over 80 celsius they may downclock to 2.6Ghz and 2.5Ghz.
     
    #240
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