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

  • Danvelopment - Sunday, May 12, 2019 - link

    This, they're dime a dozen because enterprise are dumping them and consumers are too scared to buy them. Mine is 8 core 16 thread with quad channel DDR3. Reply
  • StevoLincolnite - Friday, May 10, 2019 - link

    Running a Sandy-Bridge-E setup... So even less of a need to rush out and upgrade... 6 Cores, PCI-E 3.0, Quad Channel DDR3... Overclocks to 5Ghz.

    Haven't found anything that I can't run yet. Been an amazing rig.
  • marc1000 - Sunday, May 12, 2019 - link

    I'm trying to stay more focused on work and learning this year, so stopped using my i5-2500k@4ghz and re-activated an old laptop with i7-2620m (max 3.1ghz) with 12gb ram and an average SSD.

    As today world is heavily web-based for office-like productivity (basically reading emails, accessing online systems, and creating some documents), I'm actually amazed that this laptop is serving me so well. I use a newer i5-8350u at work, which obviously is faster, but the difference is not that much.

    for users that want to stay at the top of the game, upgrading makes sense. for users that just want to use the device, it does not (unless your work actually depends of such performance increases).
  • soliloquist - Monday, May 13, 2019 - link

    Still rockin' a 2500K!

    Over the years I have stuffed it full of RAM and SSDs and still works well for my needs.
  • AdhesiveTeflon - Monday, May 13, 2019 - link

    I still have some CAD users rocking it on a 2600 (non-K) and and SSD just fine too.

    I left the PC world when the 2600K was king (and the glorious Q6600 before it) and came back when the i7-6xxx series was mid-life and man was I disappointed in the lack of performance jumps that we were so accustomed to from the athlon 64 -> Core 2 Duo/Quad -> i7-2600.
  • Alperian - Tuesday, May 14, 2019 - link

    I'm still running one of these too and they were great like my Northwood before it.
    I am soon getting a 9900k R0 stepping if I hear good things and relegate this PC to a home Ubuntu server.

    I do wish I could afford to upgrade more regularly though. 8 years is too many.
  • Marlin1975 - Friday, May 10, 2019 - link

    Still running my 3770 as I have not seen that large a difference to upgrade. But Zen+ had me itching and Zen2 is what will finally replace my 3770/Z77 system.

    That and its not just about the CPU but also the upgrades in chipset/USB/etc... parts.
  • nathanddrews - Friday, May 10, 2019 - link

    I originally wanted a 3770K, but missed the window to get a good deal when they were newer. My 3570K+1080Ti still scratches most of my itches, but it's the MMO-style games that really tank my CPU performance and starve my GPU. Reply
  • olde94 - Friday, May 10, 2019 - link

    I had a 2500k and had to admit tha VR needed the 4 threads full so i found a brand new 3770k for 80$ which gave me 4 extra threads for the system. This was for me enough to pull most games with my gtx 970 as i rarely play MMO's.

    ...... but rendering have me keen eyed on a threadripper......
  • philehidiot - Friday, May 10, 2019 - link

    Olde94.... I am desperately looking for an excuse to buy a Threadripper. I just can't find one.

    I suspect I'm just going to invest the money in a really sweet gun for target shooting instead but the nerd part of me still wants to cheap out on the gun and get a Threadripper....

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