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Thread: Overclock X99 Fatality, I7-5930K, G-SKILL-3000 - possible?




  1. #11
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    Unhappy Re: Overclock X99 Fatality, I7-5930K, G-SKILL-3000 - possible?

    Hi tcn,

    i experience the same behaviour (sudden increase in CPU-Temps of more than 10 degrees) while running prime95.
    Prime is running with stable temps for about 10 minutes. Then, suddenly temperatur rises into the 80s for a cuple of minutes, followed by a sudden drop back to the 70s.
    After a few minutes the cycle starts again. While the temperatur increases almost all other parameters stay the same. Monitortools like XTU just show an increase of "CPU Total TDP" from 200 at lowtemp to about 240 Watts at hightemp phases(CPU at 4.2 Ghz). During hightemp phases there is no throttling like temp- power- or current limit.
    I have no idea what's the reason for this strange behaviour.
    Another problem to me is that the system seems to be unstable. Several days with gaming with Battlefield or Call of Duty or even running prime95 for hours shows the system is stable.
    But after a few days suddenly the bootscreen tells me that the system failed to boot several times and the bios is set back to standard.
    Very strange. To me the mainboard and/or bios appears to be unstable.

    royblacky

  2. #12
    parsec's Avatar
    parsec is offline Senior Member
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    Default Re: Overclock X99 Fatality, I7-5930K, G-SKILL-3000 - possible?

    Quote Originally Posted by royblacky View Post
    Hi tcn,

    i experience the same behaviour (sudden increase in CPU-Temps of more than 10 degrees) while running prime95.
    Prime is running with stable temps for about 10 minutes. Then, suddenly temperatur rises into the 80s for a cuple of minutes, followed by a sudden drop back to the 70s.
    After a few minutes the cycle starts again. While the temperatur increases almost all other parameters stay the same. Monitortools like XTU just show an increase of "CPU Total TDP" from 200 at lowtemp to about 240 Watts at hightemp phases(CPU at 4.2 Ghz). During hightemp phases there is no throttling like temp- power- or current limit.
    I have no idea what's the reason for this strange behaviour.
    Another problem to me is that the system seems to be unstable. Several days with gaming with Battlefield or Call of Duty or even running prime95 for hours shows the system is stable.
    But after a few days suddenly the bootscreen tells me that the system failed to boot several times and the bios is set back to standard.
    Very strange. To me the mainboard and/or bios appears to be unstable.

    royblacky
    The temperature change in Prime95 is caused by the cycling of certain tests by Prime95, specifically running AVX2 instructions that Haswell processors are capable of executing.

    The temperature increase was first noticed with Prime95 and other stress testing programs with the first "mainstream" Intel Haswell processors like the i7-4770K and i5-4690K. If the UEFI/BIOS is configured to use Adaptive voltage, the VCore and VIDs will spike above the usual limit for VCore set in the BIOS. That of course increase both processor temperatures and power usage. Even without Adaptive voltage, heat and power usage increases during the AVX2 instruction phases, and can cause a BSOD if the VCore is not sufficient.

    The increase in CPU temperature can be so extreme in an over clocked i7-4770K, etc, that even with the best air coolers and CLC AIO coolers, core temperatures will reach 100C and the processor will throttle its speed to compensate. I've seen that myself with my i5-4690K, the first time I've ever had a processor throttle due to reaching Tj Max. This is related to the use of TIM between the processor die and IHS, rather than solder that is used by the Extreme processor series.

    Otherwise, issues with the X99 platform are common with all mother board manufactures, and most of them are caused by the newness of this platform. Intel needs to get some updates out to the board manufactures, although they may have made some mistakes of their own. Watch for BIOS updates.

  3. #13
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    Default Re: Overclock X99 Fatality, I7-5930K, G-SKILL-3000 - possible?

    I am relieved to hear that.
    Thanks a lot for your comprehensive explanation.

  4. #14
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    Default Re: Overclock X99 Fatality, I7-5930K, G-SKILL-3000 - possible?

    Thank you Parsec; it does emplain a lot.

    I'm waiting for another power supply as my 400W fanless is ticking when under load...... I didn't think the motherboard would eat so much power; I have to put a killowatt on this thing and find out.
    X48-ds5; Q9550S, 440MHz FSB, 3.733GHz; NH12CP-SE14; Mushkin 996599 (5-5-5-12, pc2-8500),
    Sapphire HD-5770 Vapor-X, EVGA NVidia 9800GT; Cooler Master HAF932;
    Corsair TX750

  5. #15
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    Default Re: Overclock X99 Fatality, I7-5930K, G-SKILL-3000 - possible?

    I was able to overclock my 5820k to 4.5GHz stable using 1.30v vcore and 1.9v CPU input. I turned off the usual suspects like speedstep, c-states, etc and it works great. I run about 72 degrees full load and 25 degrees at idle with a Corsair H105 in push/pull config inside a NZXT H440 case. I am running BIOS 1.50 and all is great. I decided to drop back to 4.4GHz at 1.27v vcore to bring the temps down to mid sixties at full load in OCCT. I was also able to hit 1500 MHZ on my MSI GTX 970 as well as 8GHz on the GPU memory. However, I really can't seem to overclock the memory stable above 2666 no matter what I do to RAM voltage or system agent. The RAM is G.Skill 2666 so it is ok. I am guessing there is still some optimization to be done in BIOS for DDR4. I was also able to run a M.2 hard drive as boot on Win7 Pro 64bit which is great. This really is a great motherboard and the BIOS seems to be better at this stage than many of the competitors X99 boards.

  6. #16
    parsec's Avatar
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    Default Re: Overclock X99 Fatality, I7-5930K, G-SKILL-3000 - possible?

    Your memory OC situation reminds me of how most DDR3 memory works. Try to OC it beyond the memory's specified speed, when that speed is beyond the maximum memory speed spec Intel states for your CPU, and the OC just fails. All the Haswell-E processors have a max memory spec of 2133, 2666 is a good amount beyond that.

    The main thing to do when trying to OC memory, is to relax the timings from the XMP settings, or set the timings to Auto. You may not like the timings you get when set to Auto, but the memory speed OC may work. DRAM and SA voltage helps of course, but we run out of that quickly.

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