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?
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  • Sancus - Saturday, June 15, 2019 - link

    It's always disappointing to see heavily GPU bottlenecked benchmarks in articles like these, without a clear warning that they are totally irrelevant to the question at hand.

    It also feeds into the false narrative that what resolution you play at matters for CPU benchmarks. What matters a lot more is what GAME you're playing, and these tests never benchmark the actually CPU bound multiplayer games that people are playing, because benchmarking those is Hard.
    Reply
  • BlueB - Friday, June 21, 2019 - link

    So if you're a gamer, there is STILL no reason for you to upgrade. Reply
  • Hogan773 - Friday, July 12, 2019 - link

    I have a 2600K system with ASRock mobo

    Now that there is so much hype about the Ryzen 3, is that my best option if I wanted to upgrade? I guess I would need a new mobo and memory in addition to the CPU. Otherwise I can use the same SSD etc.
    Reply
  • tshoobs - Wednesday, July 17, 2019 - link

    Still running my 3770 at stock clocks - "not a worry in the world, cold beer in my hand".

    Added an SSD and upgraded to a 1070 from the original GPU, . Best machine I've ever had.
    Reply
  • gamefoo21 - Saturday, August 10, 2019 - link

    I was running my X1950XT AIW at wonder level overclocks with a Pentium M overclocked, and crushing Athlon 64 users.

    It would have been really interesting to see that 7700K with DDR3. I run my 7700K @ 5Ghz with DDR3-2100 CL10 on a GA-Z170-HD3. Sadly the power delivery system on my board is at it's limits. :-(

    But still a massive upgrade from a FX-8320e and MSI 970 mobo that I had before.
    Reply
  • gamefoo21 - Saturday, August 10, 2019 - link

    I forgot to add that it's 32GB(8GB x 4) G.Skill CL9 1866 1.5V that runs at 2100 CL10 at 1.5V but I have to give up 1T command rate.

    The GPU that I carried over is the Fury X. Bios modded of course so it's undervolted, underclocked and the HBM timings tightened. Whips the stock config.

    The GPU is next up for upgrading, but I'm holding out for Navi with hardware RT and hopefully HBM. Once you get a taste of the low latency it's hard to go back.

    OpenCL memory bandwidth for my Fury X punches over 320GB/s with single digit latency. The iGPU in my 7700K, is around 12-14GB/s and the latency is... -_-
    Reply

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