Upgrading from an Intel Core i7-2600K: Testing Sandy Bridge in 2019
by Ian Cutress on May 10, 2019 10:30 AM EST- Posted in
- CPUs
- Intel
- Sandy Bridge
- Overclocking
- 7700K
- Coffee Lake
- i7-2600K
- 9700K
Power Consumption
One of the risk factors in overclocking is driving the processor beyond its ideal point of power and performance. Processors are typically manufactured with a particular sweet spot in mind: the peak efficiency of a processor will be at a particular voltage and particular frequency combination, and any deviation from that mark will result in expending extra energy (usually for better performance).
When Intel first introduced the Skylake family, this efficiency point was a key element to its product portfolio. Some CPUs would test and detect the best efficiency point on POST, making sure that when the system was idle, the least power is drawn. When the CPU is actually running code however, the system raises the frequency and voltage in order to offer performance away from that peak efficiency point. If a user pushes that frequency a lot higher, voltage needs to increase and power consumption rises.
So when overclocking a processor, either one of the newer ones or even an old processor, the user ends up expending more energy for the same workload, albeit to get the workload performed faster as well. For our power testing, we took the peak power consumption values during an all-thread version of POV-Ray, using the CPU internal metrics to record full SoC power.
The Core i7-2600K was built on Intel’s 32nm process, while the i7-7700K and i7-9700K were built on variants of Intel’s 14nm process family. These latter two, as shown in the benchmarks in this review, have considerable performance advantages due to microarchitectural, platform, and frequency improvements that the more efficient process node offers. They also have AVX2, which draw a lot of power in our power test.
In our peak power results graph, we see the Core i7-2600K at stock (3.5 GHz all-core) hitting only 88W, while the Core i7-7700K at stock (4.3 GHz all-core) at 95 W. These results are both respectable, however adding the overclock to the 2600K, to hit 4.7 GHz all-core, shows how much extra power is needed. At 116W, the 34% overclock is consuming 31% more power (for 24% more performance) when comparing to the 2600K at stock.
The Core i7-9700K, with eight full cores, goes above and beyond this, drawing 124W at stock. While Intel’s power policy didn’t change between the generations, the way it ended up being interpreted did, as explained in our article here:
Why Intel Processors Draw More Power Than Expected: TDP and Turbo Explained
You can also learn about power control on Intel’s latest CPUs in our original Skylake review:
The Intel Skylake Mobile and Desktop Launch, with Architecture Analysis
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nandnandnand - Friday, May 10, 2019 - link
Just get a 12 or 16-core Ryzen in 2+ months.mode_13h - Saturday, May 11, 2019 - link
If you get a gun, you'll just have to waste more money on ammo.And the thing about targets is they don't shoot back. So, it gets boring pretty quickly. Paintball is more fun.
Ghodzilla5150 - Saturday, May 11, 2019 - link
I just built an AMD Rig with a Ryzen 7 2700X, ASRock X470 Taichi Ultimate, Sapphire Nitro+ RX 590, 32gb G.SKILL RIPJAWS Series V & 2x 1TB M.2 drives (1 for OS and other for Gaming). Boots to Win 10 Pro in 8 seconds. Blazing fast in games.I just bought a Smith & Wesson 686 Plus 357 Magnum so I know what it's like to want a gun as well. I'm looking at getting a LMT Valkyrie 224.
mode_13h - Saturday, May 11, 2019 - link
Get a Ryzen 9 with 16 cores.MrCommunistGen - Friday, May 10, 2019 - link
I'm in almost exactly the same boat. I have a 3770K on Z77 running at 4.2GHz. That's all that I could get out of my chip without thermal throttling under heavy load with a 212 EVO... already running the lowest possible voltage that it is stable. Remounted the cooler several times, upgraded the fan, and switched out the paste to Thermal Grizzly but it didn't help enough to get me to 4.3GHz.I considered throwing a bigger cooler at it but decided to save that money for my next build instead.
Running 1440p 75Hz Freesync (only 48-75Hz range) display that I picked up before Vega launched with the intention of buying Vega when it released -- but I missed buying it at launch, then it was unavailable, then it was expensive, then the crypto boom meant you couldn't get one... so I bought a 1080Ti instead. Even with the newly added Freesync compatibility I'm getting a reasonable bit of stutter that frustrates me.
Strongly considering Zen2 when it comes out. I never seriously considered upgrading to anything else so far, not Haswell through KBL due to lack of performance increase for the price, and not CFL or CFL-R due to high cost. 2700X just doesn't quite have enough single-thread performance increase, but based on the swirling rumors I think Zen2 will get there.
Polyclot - Saturday, May 11, 2019 - link
I have a 2600k/z77-a. I was under the impression that the mobo wouldn't go above 4.2. At least that's where I'm at. Love the combo. No complaintsCaedenV - Saturday, May 11, 2019 - link
Nope, the cap is for the non-K chips. There you have a 42x multiplier cap with a 100 MHz clock, so you are limited to 4.2... unless you also change the base clock, but that causes other issues that are not worth the effort to address.If you have a K chip, the only limits are your RAM, and cooling. Almost all Sandy chips can hit 4.5GHz, with a majority capable of going above 4.8!
XXxPro_bowler420xXx - Saturday, May 11, 2019 - link
I have a non k 3770 running at 4.2ghz all core, 4.4 single. It's also undervolted to 1.08V and hits a MAX temp of 55-56C after months of use on a corsair AIO and liquid metal . Usually runs in the high 40s under load. Before de-lidding it, it ran in the high 60s at 4.2ghz on a corsair air cooler and arctic mx4 paste. Why are your temperatures so high?AsRock z77 extreme 4 and 16GB 2133 ram.
XXxPro_bowler420xXx - Saturday, May 11, 2019 - link
Also I agree with you on zen 2. Finally a worthy successor.CaedenV - Saturday, May 11, 2019 - link
Yep, if I were to upgrade today, it would be an AMD chip. And that is hard to say/admit with all of my inner Intel fanboy.