Intel Core i9-7980XE Pushed to 6.1 GHz On All Cores Using Liquid Nitrogen

Subject: Processors | September 25, 2017 - 09:36 PM |
Tagged: skylake-x, overclocking, Intel Skylake-X, Intel, Cinebench, 7980xe, 3dmark, 14nm

Renowned overclocker der8auer got his hands on the new 18-core Intel Core i9-7980XE and managed to break a few records with more than a bit of LN2 and thermal paste. Following a delid, der8auer slathered the bare die and surrounding PCB with a polymer-based (Kryonaut) TIM and reattached the HIS to prepare for the extreme overclock. He even attempted to mill out the middle of the IHS to achieve a balance between direct die cooling and using the IHS to prevent bending the PCB and spread out the pressure from the LN2 cooler block, but ran into inconsistent results between runs and opted not to proceed with that method.

Core i9-7980xe LN2 overclock.png

Using an Asus Rampage VI Apex X299 motherboard and the Core i9-7980XE at an Asus ROG event in Taiwan der8auer used liquid nitrogen to push all eighteen cores (plus Hyper-Threading) to 6.1 GHz for a CPU-Z validation. To get those clockspeeds he needed to crank up the voltage to 1.55V (1.8V VCCIN) which is a lot for the 14nm Skylake X processor. Der8auer noted that overclocking was temperature limited beyond this point as at 6.1 GHz he was seeing positive temperatures on the CPU cores despite the surface of the LN2 block being as low as -100 °C! Perhaps even more incredible is the power draw of the processor as it runs at these clockspeeds with the system drawing as much as 1,000 watts (~83 amps) on the +12V rail with the CPU being responsible for almost all of that number! That is a lot of power running through the motherboard VRMs and the on-processor FIVR!

For comparison, at 5.5 GHz he measured 70 amps on the +12V rail (840W) with the chip using 1.45V vcore under load.

7980xe CPU-Z overclock 6GHz.png

For Cinebench R15, the extreme overclocker opted for a tamer 5.7 GHz where the i9-7980XE achieved a multithreaded score of 5,635 points. He compared that to his AMD Threadripper overclock of 5.4 GHz where he achieved a Cinebench score of 4,514 (granted the Intel part was using four more threads and clocked higher).

To push things (especially his power supply heh) further, the overclocker added a LN2 cooled NVIDIA Titan Xp to the mix and managed to overclock the graphics card to 2455 MHz at 1.4V. With the 3840 Pascal cores at 2.455 GHz he managed to break three single card world records by scoring 45,705 in 3DMark 11, 35,782 in 3DMark Fire Strike, and 120,425 in 3DMark Vantage!

Der8auer also made a couple interesting statements regarding overclocking at these levels including the issues of cold bugs not allowing the CPU and/or GPU to boot up if the cooler plate is too cold. On the other side of things, once the chip is running the power consumption can jump drastically with more voltage and higher clocks such that even LN2 can’t maintain sub-zero core temperatures! The massive temperature delta can also create condensation issues that need to be dealt with. He mentions that while for 24/7 overclocking liquid metal TIMs are popular choices, when extreme overclocking the alloy actually works against them because the sub-zero temperatures reduce the effectiveness and thermal conductivity of the interface material which is why polymer-based TIMs are used when cooling with liquid nitrogen, liquid helium, or TECs. Also, while most people apply a thin layer of thermal paste to the direct die or HIS, when extreme overclocking he “drowns” the processor die and PCB in the TIM to get as much contact as possible with the cooler as every bit of heat transfer helps even the small amount he can transfer through the PCB. Further, FIVR has advantages such as per-core voltage fine tuning, but it also can hold back further overclocking from cold bugs that will see the processor shut down past -100 to -110 °C temperature limiting overclocks whereas with an external VRM setup they could possibly push the processor further.

For the full scoop, check out his overclocking video. Interesting stuff!

Also read:

Source: der8auer

Double the price; not so much performance though ... Skylake-X versus ThreadRipper

Subject: Processors | September 25, 2017 - 03:19 PM |
Tagged: skylake-x, Skylake, Intel, Core i9, 7980xe, 7960x

You cannot really talk about the new Skylake-X parts from Intel without bringing up AMD's Threadripper as that is the i9-7980XE and i9-7960X's direct competition.   From a financial standpoint, AMD is the winner, with a price tag either $700 or $1000 less than Intel's new flagship processors.  As Ryan pointed out in his review, for those whom expense is not a consideration it makes sense to chose Intel's new parts as they are slightly faster and the Xtreme Edition does offer two more cores.  For those who look at performance per dollar the obvious processor of choice is ThreadRipper; for as Ars sums up in their review AMD offers more PCIe lanes, better heat management and performance that is extremely close to Intel's best.

DSC02984.jpg

"Ultimately, the i9-7960X raises the same question as the i9-7900X: Are you willing to pay for the best performing silicon on the market? Or is Threadripper, which offers most of the performance at a fraction of the price, good enough?"

Here are some more Processor articles from around the web:

Processors

Source: Ars Technica
Author:
Subject: Processors
Manufacturer: Intel

Specifications and Architecture

It has been an interesting 2017 for Intel. Though still the dominant market share leader in consumer processors of all shapes and sizes, from DIY PCs to notebooks to servers, it has come under attack with pressure from AMD unlike any it has felt in nearly a decade. It started with the release of AMD Ryzen 7 and a family of processors aimed at the mainstream user and enthusiast markets. That followed by the EPYC processor release moving in on Intel’s turf of the enterprise markets. And most recently, Ryzen Threadripper took a swing (and hit) at the HEDT (high-end desktop) market that Intel had created and held its own since the days of the Nehalem-based Core i7-920 CPU.

pic1.jpg

Between the time Threadripper was announced and when it shipped, Intel made an interesting move. It decided to launch and announce its updated family of HEDT processors dubbed Skylake-X. Only available in a 10-core model at first, the Core i9-7900X was the fastest tested processor in our labs, at the time. But it was rather quickly overtaken by the likes of the Threadripper 1950X that ran with 16-cores and 32-threads of processing. Intel had already revealed that its HEDT lineup would go to 18-core options, though availability and exact clock speeds remained in hiding until recently.

  i9-7980XE i9-7960X i9-7940X i9-7920X i9-7900X  i7-7820X i7-7800X TR 1950X TR 1920X TR 1900X
Architecture Skylake-X Skylake-X Skylake-X Skylake-X Skylake-X Skylake-X Skylake-X Zen Zen Zen
Process Tech 14nm+ 14nm+ 14nm+ 14nm+ 14nm+ 14nm+ 14nm+ 14nm 14nm 14nm
Cores/Threads 18/36 16/32 14/28 12/24 10/20 8/16 6/12 16/32 12/24 8/16
Base Clock 2.6 GHz 2.8 GHz 3.1 GHz 2.9 GHz 3.3 GHz 3.6 GHz 3.5 GHz 3.4 GHz 3.5 GHz 3.8 GHz
Turbo Boost 2.0 4.2 GHz 4.2 GHz 4.3 GHz 4.3 GHz 4.3 GHz 4.3 GHz 4.0 GHz 4.0 GHz 4.0 GHz 4.0 GHz
Turbo Boost Max 3.0 4.4 GHz 4.4 GHz 4.4 GHz 4.4 GHz 4.5 GHz 4.5 GHz N/A N/A N/A N/A
Cache 24.75MB 22MB 19.25MB 16.5MB 13.75MB 11MB 8.25MB 40MB 38MB ?
Memory Support DDR4-2666 Quad Channel DDR4-2666 Quad Channel DDR4-2666 Quad Channel DDR4-2666 Quad Channel DDR4-2666
Quad Channel
DDR4-2666
Quad Channel
DDR4-2666
Quad Channel
DDR4-2666
Quad Channel
DDR4-2666 Quad Channel DDR4-2666 Quad Channel
PCIe Lanes 44 44 44 44 44 28 28 64 64 64
TDP 165 watts 165 watts 165 watts 140 watts 140 watts 140 watts 140 watts 180 watts 180 watts 180 watts?
Socket 2066 2066 2066 2066 2066 2066 2066 TR4 TR4 TR4
Price $1999 $1699 $1399 $1199 $999 $599 $389 $999 $799 $549

Today we are now looking at both the Intel Core i9-7980XE and the Core i9-7960X, 18-core and 16-core processors, respectively. The goal from Intel is clear with the release: retake the crown as the highest performing consumer processor on the market. It will do that, but it does so at $700-1000 over the price of the Threadripper 1950X.

Continue reading our review of the Intel Core i9-7980XE and Core i9-7960X!