Upgrading from an Intel Core i7-2600K: Yes

Back in 2010-2011, life was simple. We were relishing in benchmarks like CineBench R10, SuperPI, and no-one had even thought of trying to transcode video on any sort of scale. In 2019, the landscape has changed: gamers gonna stream, designers gonna design, scientists gonna simulate, and emulators gonna emulate. The way that software is designed has changed substantially as well, with more care taken for memory allocations, multiple cores and threads, and with fast storage in mind. Compilers are smarter too, and all the optimizations for the older platforms are in those code bases.

We regularly speak to CPU architects that describe how they build new processors for the next generation: by analyzing modern workload requirements. In a future of machine learning, for example, we’re now seeing hardware on mobile processors dedicated to accelerating neural networks for things like smartphone photography. (It’s interesting that smartphone SoCs today, in day-to-day use, are arguably more diverse than desktops in that regard.)

Ultimately, benchmarks have changed too. What we tested back in 2011 in our Core i7-2600K review was indicative of the way people were using their computers then, and in 2019 we are testing how people are using their computers today. On some level, one expects that what would have been the balance of compute/storage/resources back then might have adjusted, and as a result, older parts may perform better or worse than expected.

For this review, I wanted to compare an eternal idol for enthusiast desktop computing with its more modern counterparts. The Sandy Bridge Core i7-2600K that was released in 2011 was an enthusiasts dream: significantly faster than the previous generation, priced right, and offered a substantial performance boost when overclocked. The fact that it overclocked well was the crux of its staying power: if users were seeing 20-40%+ performance from an overclock and some fast memory, then the several years of Intel offering baseline 3-8% performance increases were scoffed at, and users did not upgrade.

It's a Core i7 Family Photo

The Core i7-2600K was a quad core processor with hyperthreading. Intel launched five more families of Core i7 that were also quad core with hyperthreading: the Core i7-3770K, i7-4770K, i7-5775C, 6700K, and 7700K, before it moved up to six cores (HT) with the 8700K and eight cores (no HT) with the 9700K. Each of those generations of quad cores offered slightly more frequency, sometimes new instructions, sometimes better transistor density, sometimes better graphics, and sometimes a better platform.

Features like new instructions, better integrated graphics, or the platform are valid reasons to push an upgrade, even if the raw performance gain in most tasks is minor. Moving to PCIe 3.0 for graphics, or moving to DDR4 to access higher capacity memory modules, or shifting to NVMe storage with more diverse chipset support all helped users that bypassed the popular 2600K.

In this review, we tested the Core i7-2600K at Intel’s recommended release settings (known as ‘stock’), and an overclocked Core i7-2600K, pushing up from 3.5 GHz all-core to 4.7 GHz all-core, and with faster memory. For comparison to newer CPUs, we chose the Core i7-7700K, Intel’s final Core i7 quad-core for the desktop, representing the best Intel has offered in a quad-core with HT package, and the Core i7-9700K, the latest high-end Core i7 processor.

The results from our testing paint an interesting picture, and as a result so do our conclusions. Our CPU testing was quite clear – in almost every test, the overclock on the 2600K was only able to half the deficit between the 7700K and the 2600K when both were run at stock. Whenever the overclock gave 20% extra performance, the 7700K was another 20% ahead. The only benchmarks that differed were the benchmarks that were AVX2 capable, where the 7700K had a massive lead due to the fact that it supports AVX2. In all our CPU tests, the Core i7-9700K by comparison blew them all out of the water.

For anyone still using a Core i7-2600K for CPU testing, even when overclocked, it’s time to feel the benefits of an upgrade.


The GPU testing had a different result. From 2011 to 2019, enthusiast gamers have moved from 1080p in one of two directions: higher resolutions or higher framerates. The direction moved depends on the type of game played, and modern game engines are geared up to cater for both, and have been optimized for the latest hardware with the latest APIs.

For users going up in resolution, to 4K and beyond, the i7-2600K when overclocked performs just as well as the latest Core i7-9700K. The stock 2600K is a little behind, but not overly noticeable unless you drill down into specific titles. But the overclocked Core i7-2600K is still a great chip for high resolution 60 FPS gaming.

For users staying at 1080p (or 1440p) but looking at high frame rates to drive higher refresh rate displays, there is more of a tangible benefit here. Newer games on modern APIs can use more threads, and the higher number of draw calls required per frame (and for more frames) can be driven better with the latest Core i7 hardware. The Core i7-7700K gives a good boost, which can be bettered with the full eight cores of the Core i7-9700K. Both of these chips can be overclocked too, which we’ve not covered here.

The Bottom Line

Back during 2011 and 2012, I was a competitive overclocker, and my results were focused around using the Core i7-2600K as the base for pushing my CPU and GPUs to the limits. The day-to-day performance gains for any of my CPU or GPU tests were tangible, not only for work but also for gaming at 1080p.

Fast forward to 2019, and there is only one or two reasons to stick to that old system, even when overclocked. The obvious reason is cost: if you can’t afford an upgrade, then that’s a very legitimate reason not to, and I hope you’re still having fun with it. The second reason to not upgrade is that the only thing you do, as an enthusiast gamer with a modern day graphics card, is game at 4K.

There are a million other reasons to upgrade, even to the Core i7-7700K: anything CPU related, memory support (capacity and speed), storage support, newer chipsets, newer connectivity standards, AVX2, PCIe 3.0, multi-tasking, gaming and streaming, NVMe. Or if you’re that way inclined, the RGB LED fad of modern components.

Back in my day, we installed games from DVDs and used cold cathodes for RGB.

Picture from 2006? – Battlefield 2 on a CRT.
Running an ATI X1900XTX on an AMD Athlon 3400+

Analyzing the Results: Impressive and Depressing?


View All Comments

  • Targon - Monday, May 13, 2019 - link

    I made a similar comment, Civ6 added a new benchmark with Gathering Storm as well that is even more resource intensive. Turn length will show what your CPU can do, without GPU issues getting in the way. Reply
  • Zoomer - Friday, June 14, 2019 - link

    Articles says that bmrk is being developed. Reply
  • nonoverclock - Friday, May 10, 2019 - link

    Interesting article! I'm still sitting on an i7 4770 and am debating an upgrade, would be also interesting to see a Haswell i7 in the mix. Reply
  • HomerrK - Friday, May 10, 2019 - link

    I'm one of those who bought the 2600K back in the day. A few months ago I made the move to the 9900K. Cores and price don't matter so much as feeling it will be a chip that will offer great bang for the buck for years. I think it is the spiritual successor to the 2600K and that it was a mistake to omit it. Reply
  • RSAUser - Saturday, May 11, 2019 - link

    Not even close, it's near double the price.
    The Ryzen 2700 at $300 would be a way better "successor" as it's within a lot of people's budgets, offers good gaming performance and with 8 cores is probably going to last quite a while as we move to higher threading.

    The Ryzen 2 chips moving to 7nm will probably have the largest leap in a while, so whichever one comes in around the $300 mark will probably be the "true" successor of the 2600K.
  • Targon - Monday, May 13, 2019 - link

    The issue that some will have with the 2700X is that the clock speeds are not up there at the 5GHz mark, which is what many Intel systems have been able to hit for over four years now. Third generation Ryzen should get to the 5GHz mark or possibly beyond, so there wouldn't be any compromises. Remember, extra cores will only result in better performance in some areas, but single threaded and many older programs benefit more from higher clock speeds(with similar IPC).

    Don't get me wrong, I have a Ryzen 7 1800X in this machine and wouldn't step down to a quad-core chip again on the desktop, but I do appreciate that some things just want higher clock speeds. I expect a 40 percent boost in overall performance by switching from this 1800X to the 16 core Ryzen if it hits 5GHz, and that doesn't even count the increase in core count. I may end up paying $600 or more for the CPU though, but that will keep me happy for at least another five years.
  • crimson117 - Friday, May 10, 2019 - link

    Finally retired my i5-2500K last spring for a Ryzen 2700X.

    But boy what a good run that CPU had.
  • jayfang - Friday, May 10, 2019 - link

    Likewise only recently "demoted" my i5-2500K - still has tons of grunt as family PC / HTPC Reply
  • gijames1225 - Friday, May 10, 2019 - link

    Same boat. I used a 2400k and 2500k for my two main PCs for years and years. Just replaced the 2500k with a Ryzen 5 1600 (they were $80 at Microcenter for some blessed reason). Tripling the thread count has down wonders for my compile times, but it's just amazing how strong and long lasting the IPC was on the 2ng generation Core i processors. Reply
  • qap - Friday, May 10, 2019 - link

    You've convinced me. Staying with my Sandy Bridge for another year. At 1600p difference in CPU is not that high (definitely not worth 1000+ USD for completely new system) and for day to day work it is plenty fast. Up to four threads there's very little to gain and only when more threads are at play there is large enough difference (same goes for Ryzen only there I would gain almost nothing up to four threads).
    Perhaps Zen 2 will change that, or maybe 10nm CPUs from intel when they finally arrive with new CPU architecture and not rehash of 4 year old Skylake.

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