Overclocking Intel's Core i9-7900X CPU Up to 5.8 GHz

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By Jean Michel "Wizerty" Tisserand
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Delidding An Intel Core i9 CPU

Delidding a processor involves removing its integrated heat spreader, which sits on top of the delicate die and dissipates its thermal energy across a larger surface. We're looking to delid Intel's Core i9-7900X because the company's thermal compound isn't the highest-performance stuff out there, and we want to improve the chip's ability to transfer heat into a beefier cooler. 

Back when Intel's Skylake-X-based CPUs launched, there was no tool available for delidding Core i9-7900X. We designed our own and introduced it in Tom's Hardware's Custom Core i9 De-Lidder. Check out that story for a step-by-step walk-through of the process.

To Clean, Or Not To Clean?

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Before proceeding, we tested a couple of different preparations: there's the delidded processor on the left, and the delidded chip with its upper adhesive cleaned off on the right. We wanted to measure the temperature differences before and after cleaning. We used the same thermal paste in both cases, applying Thermal Grizzly Conductonaut between the die and IHS, and Thermal Grizzly Kryonaut between the IHS and heat sink.

Red finger nail polish covered the surface-mount components surrounding the die. Conductonaut is electrically conductive, so our goal was to prevent accidental short circuits.

Afterward, we prepared the processor for testing without its IHS. This is commonly referred to as direct-die cooling, and it naturally requires an even more delicate touch, since the die is completely exposed.

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Intel Core i9-7900X
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Jean Michel "Wizerty" Tisserand
Jean-Michel "Wizerty" Tisserand is a French extreme overclocker, and former OC world champion. Passionate and curious, he's always into pushing hardware to its limits. Willing to transmit his knowledge, he created the French Overclocking Federation, and writes merciless hardware torture articles!
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15 Comments Comment from the forums
  • gasaraki
    Why didn't you just use the EVGA Dark?
    Reply
  • vasras
    Another excellent article, with temp, power and voltage scaling at various cooling/contact methods. Thank you.
    Reply
  • Reynod
    I bet crashman is spewing he didn't get this gig ... :) Well done ... nice work PresencePC!!
    Reply
  • AgentLozen
    Very interesting article. I liked your explanations of the expert bios settings on the first page. I usually just ignore the stuff in the bios I don't understand.

    While I enjoyed reading all of this, it's not something that would help me personally. I leave my CPU underclocked to >1Ghz so I can feel like I'm back in the 90's again.
    Reply
  • 10tacle
    Besides the obvious awesome overclock detail story and results, I like the fact articles remind us of Intel's failure to use the highest quality manufacturing/assembly principles on their top tier CPUs. Especially their x-Series chipsets. There is no excuse for a near-$1,000 chip to have such poor thermal management quality from the factory. I mean how stupid is that.

    One of Intel's strongest advantages over AMD for many years now has been their overclocking ability to push them beyond comparable AMD chips. But not only that, to allow future overclocking headroom for keeping the platform longer when newer and faster replacement generation chipsets are introduced. Poor thermals remove those advantages and not many people want to risk messing up their four-figure chip by de-lidding mods.

    I hope Intel takes articles like these in notice and will step it up for their next generation of high end i7 and i9 models.
    Reply
  • g-unit1111
    21039131 said:
    Why didn't you just use the EVGA Dark?

    I'm guessing because the RAM limit is only 64GB? Where every other X299 board the limit is 128GB. That would make a huge difference in getting the higher speeds.
    Reply
  • Giroro
    I don't know much about extreme overclocking, tell me more about this "cooling pot".
    It is there to hold the liquid nitrogen and separate it from the die? Is there a reason you don't submerge the entire die in liquid nitrogen instead and lose the thermal compound entirely?

    It looks like it has a significant copper plate on it. If you are already going through such extreme lengths, then why not use silver and make the plate as thin as possible?

    Also, it's pretty interesting that cleaning the processor did not help with the delid, considering that people delidding older i5/i7s say the thickness of that glue is the primary reason that a delid is effective.
    Reply
  • AgentLozen
    Giroro said:
    it's pretty interesting that cleaning the processor did not help with the delid

    I thought the same thing. I was expecting the processor to benefit from the cleaning.
    Reply
  • Giroro
    21039536 said:
    Besides the obvious awesome overclock detail story and results, I like the fact articles remind us of Intel's failure to use the highest quality manufacturing/assembly principles on their top tier CPUs. Especially their x-Series chipsets. There is no excuse for a near-$1,000 chip to have such poor thermal management quality from the factory. I mean how stupid is that.

    One of Intel's strongest advantages over AMD for many years now has been their overclocking ability to push them beyond comparable AMD chips. But not only that, to allow future overclocking headroom for keeping the platform longer when newer and faster replacement generation chipsets are introduced. Poor thermals remove those advantages and not many people want to risk messing up their four-figure chip by de-lidding mods.

    I hope Intel takes articles like these in notice and will step it up for their next generation of high end i7 and i9 models.

    The cynic in me makes me think that the primary reason Intel switched to thermal paste is for planned-obsolescence and to prevent people from using old platforms for a long time. I'm pretty sure Intel wants to sell you a new processor as often as possible.
    Cheaper manufacturing, reduced ability to overclock, Thermal paste that will probably dry out and slow down the CPU within a few years (which will make new models look faster by comparison) ... All these things are positives to a marketing executive.
    Hopefully AMD becomes even more competitive, because workmanship isn't going to improve until Intel can correlate their drop in quality with a loss of profit.
    Reply
  • cryoburner
    21039536 said:
    Poor thermals remove those advantages and not many people want to risk messing up their four-figure chip by de-lidding mods.
    Isn't that the point? If someone messes up their CPU, they have to buy a new one. And delidding voids the warranty, helping Intel more easily recognize and avoid paying for the replacement of chips that have failed as a result of high overclocks. And of course, if people are deterred from overclocking their CPU, they may have more reason to upgrade to a faster one a few years down the line. Intel doesn't want people "keeping the platform longer", and they know that those looking for the highest overclocks will currently go with them either way. Considering it can cost around $5 or so extra to solder a CPU, and most people won't be overclocking, they undoubtedly don't see much point in spending the money to do so.

    AMD is willing to, since they currently can't achieve quite the same level of clock rates on their CPUs at the high-end, and know they need to do other things to make their chips more competitive with the market leader, like adding extra cores and using solder.
    Reply