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ASRock Taichi X99 Vcore increment by 0.005 instead of 0.001 (24hr Prime95 blend)

Discussion in 'Overclocking & Cooling' started by lubox, Jan 10, 2017.

  1. lubox

    lubox n00bie

    Nov 25, 2003
    Hi guys,

    I've been out of the computer building loops for a while. Recently the wife nodded so I built myself one.
    I'm one of those that must get Prime95 blend test to run for 24hr before I can mark my build complete. As you can imagine this means a lot of tweaking and tuning.

    Today I noticed that I can no longer adjust the Vcore by 0.001 increments anymore using the A-Tuning application. When I increase the Vcore in A-tuning, and check the voltage in both HWMonitor and CPU-Z it doesn't move right away. I have to make a few increments (say 0.002 or 0.003) then the voltage on the CPU increased by a whole 0.005V!

    Right now I am running the CPU at 4Ghz at 1.250V I believe (yes, can only believe) my golden voltage value was 1.252. I was able to set this voltage at a previous run (got to 15hr52m before a worker died) couple days ago so I don't think I was dreaming. I am almost 12hr into Prime95 blend already now at 1.250V so this might actually be the new and true golden value. But if it's not, how do I adjust it to 1.252???

    I attached a screenshot of my system information. You can see A-Tuning Vcore set at 1.249 but the VID is 1.250 (when I change A-Tuning to 1.251 it stays at 1.250 and so on...

    Also, does the bus speed always less than 100Mhz? it's bugging the hell out of me too :'(

    Thanks for reading!

    Attached Files:

  2. pendragon1

    pendragon1 [H]ardness Supreme

    Oct 7, 2000
    if you haven't built a system in a while then that is why you don't realizes this is all normal. your "voltage issue" is probably due to llc trying to balance things out. and yes your bus speed will never be exactly 100 you might even see 99.8 oh noes!! its nothing to worry aboot and nothing that you can do aboot it. also just in case you didn't know and want to go higher since you have the cooling for it, 1.35v is the recommended max voltage for 24/7 use. you have lots of room to play with between your cooling, temps and max volts.


    a lot of people DO NOT trust prime95 anymore. It overheats and over works your cpu was too hard and can lead to chip deterioration. your best bet and a more true "real use" test is realbench for how ever long you want. Kyle_Bennett, Peter2k and I were just talking aboot this. its all to do with the unrealistic use of avx instructions in prime95. it started with people talking about the new avx offset on the z270 boards.

    ps: kyle is you see this, youre member #3. whos 1 and 2?
  3. Rvenger

    Rvenger [H]ard|Gawd

    Sep 12, 2012
    Sounds like spread spectrum is enabled. I have this board and do not have this issue or notice it at least.
  4. lubox

    lubox n00bie

    Nov 25, 2003
    hey Pen, thanks for your reply. It helps a lot :).

    Regarding my temp... guess I'll take that compliment ^.^. It involves an H115i, 6 high pressure case fans, MINUS both the case panels and the room window in London Winter. :D Computer is in a very small room so it heats the whole room up pretty quickly without the window open. The In Win case isn't well ventilated for 4 high pressure fans exhaust on the side.

    I'm not into overclocking for the sake of overclocking though. I knew I can run the 6800k at 4Ghz stable because that's such a modest overclock from what I've seen so that's what I did. It's stable now (24hr blend yes!). There might come a time when I push the chip harder but at the moment I don't really feel like doing another 24hr run (2 weeks to tweak Prime95 blend to hit 24hr at 4Ghz!) Don't want to go through that again for 500Mhz more.

    Rvenger, we have almost identical machine! I would say if you want to run Prime95 for 24hr 1.250vcore is the secret... I can give you my OC BIOS setting if you want as well.
    I might try spread spectrum setting to see it if affects the vcore like you said.
    pendragon1 likes this.