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  1. Z

    What controls Turbo Core in Xeons?

    Thats pretty interesting. Thanks for the mind. There was a flaw in the earlier microcodes. Thats why the TDP Limit bypass works in the first place. Further it means they could correct it software wise. So there is some hidden code, which we didnt understand yet, to influence that calculation. If...
  2. Z

    What controls Turbo Core in Xeons?

    Thank you! When I have time I look into it. For me it did not solve the bug. Anyway its not only the BSOD you will face problems with. See above mentioned bugs. Much earlier post in this thread already discussed this issue and suggestions kept disabling C3. However as you already said, most of...
  3. Z

    What controls Turbo Core in Xeons?

    Both C3 and C6 (and their package state limits) are broken. Both should be disabled and can lead to a lockup. You can read about it in the Intel Whitepapers. https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-e5-v3-spec-update.pdf See HSE20, HSE 25 and...
  4. Z

    What controls Turbo Core in Xeons?

    Not necessarily, cause the question is different. Its more like, how well is the voltage curve of Intel ? And as second, if we use adaptive undervolt and lower it too much, do we get instability for high, medium or low core load, or for the load switch ? No one can tell this. But all of them are...
  5. Z

    What controls Turbo Core in Xeons?

    Did anyone tried to use fixed core voltage instead of core voltage offset, and if so how are the results ?
  6. Z

    What controls Turbo Core in Xeons?

    I found out something new. Might be interesting for you. So as many people observed, running inside of OS without microcode your cpu utilizes a higher multiplier, yes ? Probably, we all wondered why. So if you start Windows with OS-microcode also start hwinfo64 und stress all your cores...
  7. Z

    What controls Turbo Core in Xeons?

    Does anyone know how CPU / OS decides if to use "per core boost" or "all core boost" ? Testing with Prime95 using torture 3 threads CPU runs in per core boost, but once I switch over to 4 threads CPU prefers to use all core boost. That is quite inefficient as with 4 threads in per core boost he...
  8. Z

    What controls Turbo Core in Xeons?

    Someone knows of a method to spoof particular core-VID readings ?
  9. Z

    What controls Turbo Core in Xeons?

    Interesting, did you tried with or without disabled vcoms ? @Dufus, might it be possible that setting vcom/fivr faults is per domain, or is it global ? Im actually not home, so I cant test it out. Anyway did you made different observation with FIVR fault/efficiency disabled ? Dufus thanks for...
  10. Z

    What controls Turbo Core in Xeons?

    I tried, you were right. I hit the 180W. However stragenly hot production was a lot less. In average my CPU kept 8°C cooler than stresstest by Prime95 (which hits only 160W). However heat waste is fully absorbed by my oil bath cooling :D From what I recall in electrical sheets Haswell has an...
  11. Z

    What controls Turbo Core in Xeons?

    @Dufus, I could follow you here on 603. Interesting. I am a bit surprised your CPU consumes so much power. Got my 2686v3 (same TDP) on 160W in AVX2 with stable x31 Multi. Are you experiencing an vcore throttle ? Im pretty sure mine is much lower. Need to check that tomorrow. From what I recall...
  12. Z

    What controls Turbo Core in Xeons?

    @kjboughton No the reduction itself of VCCin did not faked the CPU Package Power. Disabling SVID comm's in combination with locking VCCin into fixed mode did the trick. Dufus already told so and the functionality of Throttlestop does exactly this, as I could follow the thread correctly (+600...
  13. Z

    What controls Turbo Core in Xeons?

    @Dufus, I experimented with MSR 0x1AA now. Did not made any difference whatever bit I set. However I locked SVID like you said and it worked. Now I've constant faked cpu package power draw. Thanks again!
  14. Z

    What controls Turbo Core in Xeons?

    'Cause it makes no difference if you enforce uncore update. By my observation uncore neither makes a difference in maximum frequency nore in average. In fact it shouldnt even matter in overall performance in an Intel cpu. The C-state jumping happens in picoseconds, but is an important(!) Intel...
  15. Z

    What controls Turbo Core in Xeons?

    In fact, I didnt claim that. However, your pictures sadly doesnt include a long run to see level TDPs.
  16. Z

    What controls Turbo Core in Xeons?

    No, it depends on the efi file. The recent files somehow fake the power readings and by this the card isnt throttling in TDP, which it should. Its true that AVX2 unload (AVX1 doesnt reduce frequency by design) isnt active in pre8 mc, but it gets still throttled by higher TDP. And there is no...
  17. Z

    What controls Turbo Core in Xeons?

    Im curious how you managed such high TDP ? My CPU is throttling on its pre-defined TDP level 0 and 1. Tries to overwrite it, even with efi, didnt succeed. How did you proceed to manage it ?
  18. Z

    What controls Turbo Core in Xeons?

    Yup, let us know. :)
  19. Z

    What controls Turbo Core in Xeons?

    Has anyone else more information on the msr 0x150 ? Sadly there is no official documentation from Intel about it, except mentioning the purpose.
  20. Z

    What controls Turbo Core in Xeons?

    @sciff, I sit in LFM on ~14-15 W. Also should mention OS changed consumption. Now sitting on win10 64x cu2 (thread sheduler and power saving model was changed). With pre-cu1 I was on 18-19 Watt. Also using no microcode. Noticed constant 10-15 Watt usage increase with mc (look my first post in...
  21. Z

    What controls Turbo Core in Xeons?

    Readings are real. Beside monitoring current demand I also use an external plug which gives me the same increase in current demand compared without having deleted mc, but also in comparison to idle current demands. Its all about numbers. Your model is just an bumped up version of mine, that...
  22. Z

    What controls Turbo Core in Xeons?

    Hey randir, please send us your source files. I would really like to look at them. Anyway, what you think how you managed to get another +1 to the multiplier? I tried by myself to adjust vccin even with an offset of -120mV, but even as it changed, multiplier kept the same. So I seriously ask...
  23. Z

    What controls Turbo Core in Xeons?

    It works on single quite well. First I used Dufus v3.efi, but as Welsper offered his source, I took over and modified by myself a bit, just for experiment. Im by myself curious, if we could get more out of our Xeons. btw, thanks Dufus and Welsper! @Welsper thanks for the work comparing...
  24. Z

    What controls Turbo Core in Xeons?

    It is an bug in Haswell itself. Look into the intel paper under HSE20 and HSE67 http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-e5-v3-spec-update.pdf Like the other bugs it didnt got fixed, but a bios workaround was found (microcode) Also take a look at...
  25. Z

    What controls Turbo Core in Xeons?

    My idle without microcode and original v3.efi and activated c-states goes down to 17W, under full load up to 95W. During usual desktop and browsing my cpu wanders betwenn 30W and 50W. Are there any details how the power limits got changed ? Is there any result observed after changing them ? I...
  26. Z

    What controls Turbo Core in Xeons?

    First of all is needed to know what kind of motherboard you have. This determines what bios you have. And in the end you get linked to forums win-raid.com, as they have all details and tutorials about bios modding, quite nicely explained even for newbies.
  27. Z

    What controls Turbo Core in Xeons?

    Read the first 3 pages, there is everything described in detail.
  28. Z

    What controls Turbo Core in Xeons?

    What kind of voltage control you expect to have ? The Haswell Xeon architecture doesnt allow by hard lock many settings. There are no FIVR settings or real vcore settings (the cpu decides all by itself). All you can do is to modify the voltage input slightly, which may lower temperature and...
  29. Z

    What controls Turbo Core in Xeons?

    Does anyone know if it is possible to force/overwrite somehow the p-states or number of cores which are in turbo used ? Lets say I want him for some time constantly in 4core turbo, how I can enforce this despite calls from other sources. How is that achievable ?
  30. Z

    What controls Turbo Core in Xeons?

    Thanks for the feedback! The results for HT off with 35x on allcore I can repeat. But whatever I try about HT on allcore I never pass x27 with MC 0x27 or 0x39, even with copying your settings fully. Makes me a bit desperate, cause I know the cpu can do more, but I dont get how. Quite nice...
  31. Z

    What controls Turbo Core in Xeons?

    As each cpu unit type has an unique id there shouldnt be a switch in system. However the Turbos are written by Dufus and I dont know how he wrote them for 2696v3. You can check that by using ru.efi after you injected dufus v3.efi, as you can read out your turbo in cpu msrs than. By myself I wish...
  32. Z

    What controls Turbo Core in Xeons?

    Hey @lucien_br how you managed to get such constant Turbos and high clocks? How your cpu clocks in BF1 is awesome! Also at minute 6:08 your clockrate is awesome. Can you explain please what you did differently ? Im especially interested in the microcode you use. Please, share ! :D As here are...
  33. Z

    What controls Turbo Core in Xeons?

    I only get such problems if I boot without the injected v3.efi from Dufus. I think windows might be confused with how to use the cpu and crashes. But once efi is loaded the system runs 100% stable. Entering UEFI and saving sometimes deletes the booting entry of the v3.efi for some reason. I...
  34. Z

    What controls Turbo Core in Xeons?

    Hi there, First of all, thanks to everyone for contribution and special thanks to Dufus and Stilt ! Now I got my E5-2686v3 at constant ratio of 28x (+500MHz) on allcore! From where you got them ? And how to get other microcode versions in .dat format ? I would like to try others. Are you...
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