Intel Core i9-7900X Review: Meet Skylake-X

Temperature & Thermal Problems

Cooling Nuclear Option: The Chiller

As mentioned, we had to use Alphacool's Eiszeit Chiller 2000 to achieve usable overclocking results. More conventional thermal solutions just wouldn't cut it. All-in-ones like Corsair's H100i and Enermax's LiqTech 240 hit their limits at stock frequencies under Prime95. The custom loop threw in the towel at 4.6 GHz.

Why can't those liquid coolers keep up with a CPU like the -7900X? Back in the day, a normal all-in-one was good enough to keep the Core i7-5960X running cool, even overclocked to 4.8 GHz. We measured power consumption numbers of up to 250W back then. So, why did we have to force a constant 20°C in the loop to even start experimenting?

High Temperature Differences Challenge Cooling Performance

The reason that Skylake-X is so much harder to cool traces back to the thermal paste Intel chose to use instead of solder between the processor die and heat spreader. Although paste is cheaper, it's also less than ideal for cooling performance.

Intel’s digital temperature sensors report reliable results from 35 to 40°C and up, prompting us to only include values above that range in our analysis. The difference between the water cooling block's temperature, which is held at a constant 20°C, and the CPU temperature reported by Intel's sensors shows just how bad of a choice thermal paste really was.

We measured the CPU heat spreader’s temperature the same way we did when AMD launched Ryzen 7 1800X, by using a thin copper plate. The resulting curve shows very clearly that waste heat can't be dissipated quickly enough. A solution good enough for a thermal lightweight like Intel's Core i7-7700K just doesn’t work for Core i9-7900X.

This curve represents the temperature delta, which is to say the thermal difference between Core i9-7900X’s cores and the top of its heat spreader. The outcome is shocking:

In the end, the delta between the cores and top of the heat spreader reaches 71°C, and that's using one of the best cooling setups money can buy. Naturally, lesser thermal solutions start running into trouble at stock frequencies when you run a stress test.

To illustrate our point, we plotted the temperature for all of the Core i9-7900X’s cores at stock settings running Prime95 or LuxRender. A good custom water-cooling loop does fairly well, which shouldn't come as a surprise. However, no other thermal solution will be able to keep up. Even the motherboard manufacturers we spoke to agree, telling us about their all-in-one liquid coolers running out of headroom as soon as they ran Prime95 without limiting AVX.

A Tcore of up to 65°C and a heat spreader temperature of approximately 24°C make for a difference of more than 40°C. That's at 230W. Once the 300W line is crossed, even the Alphacool Eiszeit Chiller 2000 taps out. This isn’t even difficult to do: with a Core i9-7900X running at 4.6 or 4.7 GHz, using the voltages needed to get there, even simple rendering applications trigger those levels. The highest power consumption numbers we saw were just north of 300W, which had the CPU hitting its 100°C thermal limit consistently. An emergency shutdown followed soon after.

Leakage

Next, we measured power consumption under a constant load using different coolers. For a temperature increase of approximately 40°C, power consumption increases by five percent. This isn’t just an acceptable result, but a really good one. The values above 100°C are not as reliable due to throttling. Consequently, we made an exception and used a low-pass filter that smoothed out the brief decreases.

Everything could have been great, if it wasn't for the thermal paste between Intel's die and heat spreader. Admittedly, most workstation or semi-pro users won't overclock, cutting down on the number of customers affected by this problem. But we all know that affluent enthusiasts attracted to Skylake-X's balance between high frequencies and core counts will have to face a significant cooling challenge. Your choices come down to high-end all-in-one packages or a custom water-cooling loop. Air cooling is completely out of the question if you expect the -7900X to run comfortably under full load.

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    Top Comments
  • Anonymous
    Pros: 10/20 cost now $999
    Cons: Everything else

    My biggest problem with this Intel lineup is that if you want 44 PCIe you have to pay $999. No, thanks. My money goes to AMD ThreadRipper.

    Good review!
    31
  • Jakko_
    Wow, compared to the Ryzen 1800X, the Intel Core i9-7900X:

    is about 25-30% faster
    costs 105% more
    uses 35-40% more power

    Ryzen looks really good here, and together with the temperature problems, Intel seems to be in some deep shit.
    30
  • HardwareExtreme
    Too little, too late. Does Intel really think that just because it has "Intel" written on it that it must be worth $200-$300 than AMD?
    18
  • Other Comments
  • Anonymous
    Pros: 10/20 cost now $999
    Cons: Everything else

    My biggest problem with this Intel lineup is that if you want 44 PCIe you have to pay $999. No, thanks. My money goes to AMD ThreadRipper.

    Good review!
    31
  • rantoc
    Doubt many who purchase such high end cpu for gaming runs at a low full hd 1080p resolution, i know its more cpu taxing to run lower res at higher fps but that's for the sake of benchmarking the cpu itself.

    I would like to see 1440p + 2160p resolutions on a suitable high end card (1080ti or equalent) benchmarked with the cpu as well as it would represent real scenarios for the peeps considering such cpu.

    Thanks for a good review!
    6
  • James Mason
    So it seems like de-lidding the x299 processors is gonna be a standard thing now to replace the TIM?
    4
  • elbert
    Meet netburst 2.0 that not only can hit 100c at only (4.7Ghz)1.2v on good water cooler but only barely beats a 7700k not overclocked in games. All this is yours for the low low price of 3X. Its slower than the old 6950x in a few tests with was odd.
    9
  • prophet001
    There's obviously a problem if the delta is that high.
    1
  • James Mason
    Anonymous said:
    Doubt many who purchase such high end cpu for gaming runs at a low full hd 1080p resolution, i know its more cpu taxing to run lower res at higher fps but that's for the sake of benchmarking the cpu itself.

    I would like to see 1440p + 2160p resolutions on a suitable high end card (1080ti or equalent) benchmarked with the cpu as well as it would represent real scenarios for the peeps considering such cpu.

    Thanks for a good review!

    The differences would be less noticeable at higher res than 1080p, so.... you'd just see less dissimilar numbers.
    1
  • Dawg__Cester
    Hmmmmm. I bought a Ryzen 1700, a water cooler, Asrock B350 MB, 16gb ram 3200Mhz for $590 plus tax. I live in New Jersey. I was very nervous about making the purchase as I knew this was coming out this week but the sale prices got me. Unless you all think I got ripped off, (DON'T TELL ME). But in all honesty I have not regretted the purchase one bit!! I even managed to save enough to get a GTX 1080 FE GPU. I did have a few bumps in the road getting the system stable (about 3 hours configuring after assembly) but I am VERY happy. I used Intel primarily and never really considered AMD other than for Video adapters and SSDs.
    After reading this along with other articles and YT videos, I have no regerts as I enjoy my Milky Way and play my games among other things.
    Just my experience. I am not seeking positive reinforcement nor advice.
    I just feel very satisfied that I did not wait and cough up 3oo more fore something I could have for less. I know, I know it makes no sense.
    But come on fellas, its the computer game!!
    10
  • James Mason
    Anonymous said:
    Hmmmmm. I bought a Ryzen 1700, a water cooler, Asrock B350 MB, 16gb ram 3200Mhz for $590 plus tax. I live in New Jersey. I was very nervous about making the purchase as I knew this was coming out this week but the sale prices got me. Unless you all think I got ripped off, (DON'T TELL ME). But in all honesty I have not regretted the purchase one bit!! I even managed to save enough to get a GTX 1080 FE GPU. I did have a few bumps in the road getting the system stable (about 3 hours configuring after assembly) but I am VERY happy. I used Intel primarily and never really considered AMD other than for Video adapters and SSDs.
    After reading this along with other articles and YT videos, I have no regerts as I enjoy my Milky Way and play my games among other things.
    Just my experience. I am not seeking positive reinforcement nor advice.
    I just feel very satisfied that I did not wait and cough up 3oo more fore something I could have for less. I know, I know it makes no sense.
    But come on fellas, its the computer game!!


    PCPartPicker part list / Price breakdown by merchant

    CPU: AMD - Ryzen 7 1700 3.0GHz 8-Core Processor ($299.39 @ SuperBiiz)
    Motherboard: ASRock - AB350M Micro ATX AM4 Motherboard ($65.98 @ Newegg)
    Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory ($124.99 @ Newegg)
    Total: $490.36
    Prices include shipping, taxes, and discounts when available
    Generated by PCPartPicker 2017-06-19 10:47 EDT-0400

    Depends on which watercooler and which ram, but not really.
    0
  • Jakko_
    Wow, compared to the Ryzen 1800X, the Intel Core i9-7900X:

    is about 25-30% faster
    costs 105% more
    uses 35-40% more power

    Ryzen looks really good here, and together with the temperature problems, Intel seems to be in some deep shit.
    30
  • HardwareExtreme
    Too little, too late. Does Intel really think that just because it has "Intel" written on it that it must be worth $200-$300 than AMD?
    18
  • vasras
    With these results and crippling by Intel, I think I can wait another 2 months for the ThreadRipper.
    Thank goodness for competition.
    11
  • logainofhades
    Still would buy a Ryzen 1700, and overclock it, over this. The 7900x might be faster, but not enough to justify the higher price tag. I personally think the i9 was a knee jerk reaction to threadripper.
    15
  • the nerd 389
    Is there any way you could investigate the performance of AVX-512 on that CPU?

    The thermal paste has me worried that they won't be able to deliver significant gains over last year's models in that department.
    2
  • MaximusOptimus
    Why are you only using DX11 and 1080P. I would like to see 1440p and 4k game paly
    -1
  • logainofhades
    Anonymous said:
    Why are you only using DX11 and 1080P. I would like to see 1440p and 4k game paly


    Lower resolutions put more of a load on the CPU.
    9
  • Dawg__Cester
    Anonymous said:
    Anonymous said:
    Hmmmmm. I bought a Ryzen 1700, a water cooler, Asrock B350 MB, 16gb ram 3200Mhz for $590 plus tax. I live in New Jersey. I was very nervous about making the purchase as I knew this was coming out this week but the sale prices got me. Unless you all think I got ripped off, (DON'T TELL ME). But in all honesty I have not regretted the purchase one bit!! I even managed to save enough to get a GTX 1080 FE GPU. I did have a few bumps in the road getting the system stable (about 3 hours configuring after assembly) but I am VERY happy. I used Intel primarily and never really considered AMD other than for Video adapters and SSDs.
    After reading this along with other articles and YT videos, I have no regerts as I enjoy my Milky Way and play my games among other things.
    Just my experience. I am not seeking positive reinforcement nor advice.
    I just feel very satisfied that I did not wait and cough up 3oo more fore something I could have for less. I know, I know it makes no sense.
    But come on fellas, its the computer game!!


    PCPartPicker part list / Price breakdown by merchant

    CPU: AMD - Ryzen 7 1700 3.0GHz 8-Core Processor ($299.39 @ SuperBiiz)
    Motherboard: ASRock - AB350M Micro ATX AM4 Motherboard ($65.98 @ Newegg)
    Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory ($124.99 @ Newegg)
    Total: $490.36
    Prices include shipping, taxes, and discounts when available
    Generated by PCPartPicker 2017-06-19 10:47 EDT-0400

    Depends on which watercooler and which ram, but not really.


    Like I said, I wasn't looking for positive reinforcement or validation as I am more than happy with my set up. But thank you for checking.
    4
  • Randall_Lind
    Why an i5? I thought this was i7 only.
    0
  • dusty13
    well ... at least for 1000 bucks you now not only get a fairly powerful cpu but also a heater for the winter / grill in the summer ... and that just with the standard 10 core model.

    imagine the potential of the obviously unplanned and hastily shoehorned in 12-18core models once they come out in 2018 ... your rig will go nova ^^
    13
  • AgentLozen
    LogainofHades said:

    Lower resolutions put more of a load on the CPU.


    I agree. Imagine if you ran Grand Theft Auto 5 in 640x480 mode. Your graphics card would barely have any work to do. All that's left is whatever the game asks from the CPU. That's when you see which CPU shines brightest.

    Regarding the 7900x, I'm glad to see that Intel responded so quickly to Ryzen. It's too late in the development cycle to make Skylake-X a Ryzen killer, so what we get to see is what Intel had planned for us before AMD made it's comeback.

    The article isn't very flattering toward Skylake-X but it's a much better deal than Broadwell was a year ago. Mostly higher performance at a lower price point. Good for Intel! Good for competition. Still, if I were building a PC right now I might go Ryzen.
    1
  • RanKing7
    "Still would buy a Ryzen 1700, and overclock it, over this. The 7900x might be faster, but not enough to justify the higher price tag. I personally think the i9 was a knee jerk reaction to threadripper."

    You're wrong. I don't even think you understand how processors are made. No company just says "they released that?! Quick make a 10 core processor".

    If 30% increase in performance isn't enough to justify the price tag -- than the processor was never for you to begin with. Neither is Threadripper. These processors are not for budget builds or for feeling the need to justify your decisions to save money. They are for a specific market that is very little of Intel's bottom line.
    -8