Xeons with an open multiplier

Discussion in 'Processors and Motherboards' started by BlackArchon, Aug 5, 2017.

  1. BlackArchon

    BlackArchon Member

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    Multiplier-unlocked Xeons according to overclocking results from HWBOT:
    Bloomfield:
    W3570 (source)
    W3580 (uncertain)
    Gulftown:
    W3680
    W3690
    Gainestown:
    W5580 (most probably not unlocked, despite of one CPU-Z validation; please see also https://forums.servethehome.com/ind...h-an-open-multiplier.15983/page-5#post-209642)
    W5590 (most probably not unlocked)
    Sandy Bridge-EP:
    E5-1620 (source - max CPU multiplier is 43, just like the i7-3820)
    E5-1650
    E5-1660
    Ivy Bridge-EP:
    E5-1620 v2 (source)
    E5-1650 v2
    E5-1660 v2
    E5-1680 v2
    Haswell-EP:
    E5-1650 v3
    E5-1660 v3
    E5-1680 v3
    Broadwell-EP:
    None
    Skylake-W:
    W-3175X

    Additional confirmed observations:
    - all Xeon E5 v3 with C2 stepping can be clocked all cores to max turbo multiplier (called Xeon turbo core exploit)

    ----

    Since there don't seem to be a definite source about which Xeons are overclockable by changing their frequency multiplier, I want to create one.
    While "common knowledge" of most people seems to be that Xeons don't have an open multiplier, a few guys know it better. For example, my Xeon E5-1680 v2 can be overclocked solely by changing the CPU multiplier.

    When googling terms like "xeon overclockable", you will occasionally find statements like "the E5-16xx series Xeons have an open multiplier when there is an equivalent i7" or "all E5-16xx series Xeons are overclockable from the model number of 1650 and upwards" or "this only applies to v1, v2 and v3 Xeons". While all of these statements seems to be correct to a certain point, I got the feeling that noone really knows exactly.
    The fact that there are hardly any reviews of these Xeons out there emphasizes the uncertainty.

    So please share your knowledge, and if you got sources or screenshots of an multiplier-overclocked Xeon, please post them in this thread. I will edit this first entry and collect the facts in the hope to shed light into Xeon overclocking once and for all. :)

    I will start with my semi-knowledge:
    - There are only overclockable Xeons from the E5-1600 series range of processors, the E5-2600 are all locked (quite sure)
    - Beginning with the v4 Xeons, they are all locked (someone at the HardOCP forums stated this)

    Probably not unlocked:
    W3565 (source) No, a user reported that it isn't unlocked (source)
     

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    #1
    Last edited: Aug 19, 2019
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  2. Patrick

    Patrick Administrator
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    There are systems that will let you overclock RAM for example on E5-2600 V1-V4 systems. Intel does not like the term overclock so it is more of frequency optimized or some similar label.
     
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  3. zir_blazer

    zir_blazer Active Member

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    I think I recall that on HardOCP there was a Thread talking about Unlocked Multipliers in Xeons E5. They applied at least for the 1600v2 and 1600v3 series, and the feature was removed for the 1600v4 series.
    Since the E5 1600 and the HEDT Ci7 shares almost everything in common, chances are that someone forgot until Broadwell-E that they shouldn't have Unlocked Multiplier to begin with.
     
    #3
  4. BlackArchon

    BlackArchon Member

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    Yes, the thread on HardOCP (found it: Intel Xeon E5-1680 v2 3.0GHz 25MB Cache 8-Core Processor - this got me interested in the E5-1680 v2 in the beginning) was a very interesting starting point for me when I begun to dive deeper into the matter of unlocked Xeons. But this thread has the same issues: some people assume this, some people assume that. Distinguishing facts from assumptions is the hard part.

    Since I assume that STH has the highest amount of Xeon users (at least the highest Xeon user ratio per forum member), the people here should know the most about unlocked Xeons. :)
     
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  5. nfsden

    nfsden Member

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    e5 2660-2670 is still best choice for $80-90 price tag, especially for dual socket systems.
     
    #5
  6. BlackArchon

    BlackArchon Member

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    They don't have an unlocked multiplier, so they don't matter for this thread.
     
    #6
  7. Patriot

    Patriot Moderator

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    My 1680v3 is not unlocked or has not found a board that sees it as such. :(
     
    #7
  8. BlackArchon

    BlackArchon Member

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    Wow, this is the first time I hear of this problem. Which mainboards did you test with your Xeon?
     
    #8
  9. Patriot

    Patriot Moderator

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    Asrock
    asrack EPC612D4I
    x99 Extereme 6 (original)
    and I think I dropped it in the Taichi as well.
     
    #9
  10. Nanotech

    Nanotech Active Member

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    Actually multiplier unlocked Xeons have been discussed in the ES Xeon thread. I know because I've discussed them and even mentioned it as well. Yes the E5-16 V1/V2/V3 lineup is multiplier unlocked but there are certain versions that are not multiplier unlocked as an exception. For example the lower end E5-16 variants such as the 4c/4t are multiplier locked.

    Also about the E5-16 V4 versions there are stories and rumors floating around that the ES versions are multiplier unlocked (probably because they are 6900K ES's etc...)
     
    #10
  11. nfsden

    nfsden Member

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    also all Xeon e5 v3 with c2 stepping can be clocked all cores to max multiplier (called xeon turbo core exploit)
    [​IMG]
     
    #11
  12. BlackArchon

    BlackArchon Member

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    This approximate knowledge is exactly what I try to make more precise. What versions exactly have an unlocked multiplier, which haven't?

    If we start about ES's, we won't come to an end any time soon - so let's focus on retail Xeons for the time being. :)
     
    #12
  13. BlackArchon

    BlackArchon Member

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    Thanks, I forgot about this. Added to the opening post! :)
     
    #13
  14. BlackArchon

    BlackArchon Member

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    Wow, that's odd. And you could successfully overclock other CPUs with these motherboards?
     
    #14
  15. Patriot

    Patriot Moderator

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    I mean... they are desktop overclocking board... if I owned a pleb cpu I suppose it could overclock.
     
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  16. BlackArchon

    BlackArchon Member

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    Ok, I will list the E5-1680 v3 as a locked CPU.
     
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  17. n-type

    n-type New Member

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    Any links to an example of V3 with RAM at 2400MT/s or higher?

    First time I've heard it called that, usual name is MCE (Multi Core Enhancement) Would think it should work on earlier stepping too but perhaps people are not doing the BIOS work.

    You can sometimes check published XTU bench settings, i.e. Google "XTU 1680 v3" without the quotes.

    Looking at a 1680 v3 we see
    [​IMG]

    Which tells us it's turbo overclockable and unlimited. Well unlimited in this case means up an 80x multiplier.


    Sometimes CPU-Z results can help but be aware of faulty / doctored results.

    [​IMG]

    Top 15 Highest frequencies for Intel(R) Xeon(R) CPU E5-1680 v3 @ 3.20GHz - CPU-Z VALIDATOR
     
    #17
  18. Nanotech

    Nanotech Active Member

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    It probably depends on the motherboard used but Patriot did mention he tried the AsRock X99 Taichi and the Xtreme 6 and it wasn't unlocked. Perhaps the processor itself or the motherboard didn't recognize it was unlocked.

    Looking at that CPU-Z validation that voltage is way too excessive for Haswell-E/EP. 1.3v is the max VID range according to Intel. I wouldn't go anywhere past that for overclocking.
     
    #18
  19. BlackArchon

    BlackArchon Member

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    @n-type: Looking to hwbot is actually a really good idea. Since there are so many people with overclocked E5-1680 v3 CPUs, it must be unlocked. Patriot's difficulties must have another reason.

    @Patriot: Is your CPU a retail version (no ES/QS)?
     
    #19
  20. tbob22

    tbob22 New Member

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    #20
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