Intel Core i7-5775C Broadwell Processor Review

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Intel Core i7-5775C Processor Overclocking

Intel Core i7-5775C Turbo Clock

The Intel Core i7-5775C is capable of hitting 3.7 GHz by default thanks to the Intel Turbo boost mode.


We overclocked the Intel Core i7-5775C processor by simply increasing the multiplier and raising the voltage on the processor when needed. The UEFI microcode for enabling eDRAM selections and overclocking was not available in the build for the board that we have, so we left that alone for the time being (We’ll do an article on that later). By just raising the multiplier we were able to get to 4.1 GHz without needing to increase the voltage. To hit 4.2 GHz we had to increase the voltage to 1.3V and then to hit 4.3GHz we had to increase it again to 1.35V. We were able to get 4.4 GHz up and running on the desktop, but it would crash in very CPU intensive benchmarks. We went up to 1.425V on the processor and couldn’t get it stable at 4.4 GHz before calling it quits and we just benchmarked everything in our test suite at 4.3GHz.

We later learned that you can put more voltage to the processor without blowing it up right away and was able to get 4.4GHz stable at 1.475V. If you want to run 4.6-4.7GHz on one of these processors you need to run around 1.6V on the core and that is something we weren’t interested in doing and you’ll see why when we get to the power consumption section!

Intel Core i7-5775 Overclocking Expectations: 

  • 4.1 GHz – 1.225V
  • 4.2 GHz – 1.3V
  • 4.3 GHz – 1.35V
  • 4.4 GHz – 1.475V
  • 4.6 GHz and beyond – 1.6V (not recommended for normal use)

Core i7-5775C 4300MHz Cinebench

With the Intel Core i7-5775C processor running 4.3GHz we were able to score 899 on the CPU test in Cinebench. We got a score of 785 stock, so this is a nice 14.5% performance gain from this 600MHz clock frequency boost that equates to a 16% overclock. All of the performance charts in the review show the Intel Core i7-5775C at both stock and overclocked (4.3GHz), so please reference those in the pages ahead to see how the chip performs in a wider variety of benchmarks.


With the Intel Core i7-5775C running at 4.3 GHz with 1.35V to the core we hit 68C on the Corsair Hydro Series H105 CPU Water Cooler that we were using on the test bench. Not a bad temperature at all for this overclock!

Let’s see how the Intel Core i7-5775C Broadwell processor performs at both stock speeds and at 4.3GHz!

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  • deddoa

    I was expecting more from this. Integrated GFX performance is nice, but why would you buy a high end 1150 i5 or i7 and use integrated GFX. If the GFX are that important you would buy a discrete GPU, but if GFX aren’t important then you would buy a cheaper 4790K or 4770K, or more likely the non K parts and a H97 board. As for the cpu, seems 4790K is a better option at stock.

    On the plus side this may mean that AMD push out a console level APU to get back ahead of the game, it’s not like they can’t do it as they are already making the XB1 and PS4 APU’s. I doubt they will as they will likely drop the ball as they usually do, but it would be great for cheap gaming PC’s if they did and I bet they would sell like hot cakes, and god help them if the i3’s have this IGP boost. Anyway, I guess no upgrade this year for me then as my 4770K is sitting nice and stable at 4.7GHZ and these chips don’t seem to be worth the money even if it was overclocked to the same speed.

  • I love how in the gaming tests you guys just conveniently remove the i7 920 and the AMD APU’s so you can talk about broadwell keeping up with the “big boy” CPU’s.
    Because you don’t want to show that the APU’s and the 920 get virtually the same FPS as the extremely overpriced newer i7’s and that there is no reason to pay the premium?

    • Nathan Kirsch

      It’s because we dropped off the chips without integrated graphics support… There is no other ulterior motive there.

      • What?
        The APU’s all have integrated graphics and you guys are using dGPU’s to test anyway…
        Why don’t you put all the rest of the chips through the same gaming benchmarks to get a clear representation of where it sits.
        Instead of making it seem like its in a class of its own when literally the 920 is the only chip without integrated graphics.

        • Nathan Kirsch

          we have two pages of integrated graphics testing… We heard feedback from our readers that they wanted to see add-in discrete card performance as well, so we later added that. That is why not all the CPU’s were included. We just haven’t had the time to go back and re-test them all. All the testing doing with discrete GPUs have integrated graphics and we tested both iGPU and discrete on those particular chips.

        • Please test all the CPU’s with dGPUs to show subjective gains overall.

  • LionS7

    To be honest I like this CPU, but sadly I can’t afford it.

  • Mike

    It’s nice to see that Broadwell chip is a beast and it outperforms the Haswell 4790K for clock per clock performance and it’s cooler. Must buy!

  • FXi2

    x99 Broadwell cpu’s please 🙂
    @ Intel

    • Nathan Kirsch

      They are on the roadmap! Broadwell-E unless the cancellation rumors are true and they will skip it in favor of Skylake-E.

  • Nathaniel Graham

    The processor is almost as disappointing as the number of typos in this article. Thanks for the review though.

    • Nathan Kirsch

      Sorry for the typos! We run everything through the MS Word Spelling & Grammar check, but it doesn’t catch everything. Other than that we rely on peer editing and our readers is the last line of defense. Please e-mail me over the typos you see if you would like and I’ll get them fixed!

      • Persian Scientist.

        A computer that has been programmed by another man’s deceptive ability to spell check is entirely not accurate. Don’t rely on that damn thing.

  • Iluvatar Valinor

    Nice to see i7-920 in test results, has been working flawlessly ever since i got it, will upgrade to Skylake.

  • DougLord

    This would be amazing in a 5lb laptop.

  • anon

    I love to see the i7-920 in the tables! Given the performance can be considered linear up to about 4Ghz for this cpu, 4 (GHz) by its 2,66 base speed gives a 19,57*1,5=29,35 fps in handbrake.

    Ok a 2009 cpu mild oced, vs the top 2015 cpu (400Mhz less because its 3,3-3,6) gives and advantage in handbrake of 5 fps.

    Same situation with most cpu bench not involving encryption.

    Good job marketing department, because the RD department sucks.

    • Nathan Kirsch

      good points and it’s amazing how the super popular Core i7-920 is still hanging in there!

  • Geekosa

    Recommended Award.
    OMG ! Is it possible to recommend this CPU with this fucking crazy price ?

    • Nathan Kirsch

      For those looking for something with integrated graphics this is a damn good processor. In fact, I look forward to upgrading some of our Z77 systems with 3770K’s to Z97 systems with 5775C’s here for mainstream office use. Pricing isn’t too crazy… The tray pricing on the 4770K was $339 at launch. This processor is listed higher at $369, but that isn’t bad considering all the extra EU’s and eDRAM they built into the processor.

      • Geekosa

        In France the 4790K is 350 € and the 5775C is 420 €
        70 € is a huge difference ! The price of the 4790K never dropped, and the 5775C is less powerful, is launched one year later and is more expensive. How should we recommend it ?
        The 5775C should be at the same price than the 4790K.

        Do you realize ? This CPU is 90 € more expensive than the 4770K which is 2 years old, and isn’t more powerful.

        Recommend such a crap is like to agree to be whipped by a sado-masochist.

        • Nathan Kirsch

          Yeah, if there is an $80 difference you’d be better off going with a lesser priced Haswell processor and using that money for a discrete graphics card! Broadwell is recommended for those that don’t want a discrete graphics card. There is a reason it didn’t get a value award or the editor’s choice award. This card was recommended because it has the best integrated graphics performance for any CPU. That is a first for Intel and they deserve props on that.

        • anon

          I still dont get, anyway, who or recommended by who, would select an i7 top-of-the-line cpu because of its GPU capabilities. Even the poorest workstations wear a K600 GPU. This is all merchandise because they want to promote their GPU for the mobile / tablet market.

          All that die wasted in a gpu, really. Its the same core technology shrinked we had 5 years ago, and thus, more power efficient.

          Then you think, ok why i3 or i5 series, which is the target for the integrated GPU, dont have the top of the lane GPU chip on them. Basically because the lower tdp cpu would be a benefit for the gpu tdp. And you find they’ve got a crappy gpu as well.

        • Nathan Kirsch

          “All that die wasted in a gpu, really.” I guess maybe that is why all the initial batch of Intel Skylake processors will have just GT2 graphics?

        • Lindsay

          This is a 65W CPU. It should be compared to it to the equivalent 65W “S” Haswell SKUs.

        • Geekosa

          People buy unlocKed CPU for performance. They do not care about 20 W of consumption, but they care about 70 € for lower perf !

        • Billy Pistocco


      • xcore

        OC ignoring the the extra EU’s and eDRAM for the moment and take the time to realize that broadwell was a tick as in a shrink and yet we don’t see the usual 20% or greater generic speed bump with these….

        something tells me Intel have intentionally crippled 5775c broadwell to lower than 4770K default speeds just to help sell the real tock Skylake and its EU’s and reduced EU’s and eDRAM soon , and that’s a shame along with the lower eDRAM and missing AVX512 SIMD….

    • RedSun

      take a look and see what happend when i disabled the igpu and the cpu gets the 128 L4 memory cache.


  • Anonymous

    CPU performance the same as Haswell.

    A10-7800 vs. i7-5775C graphics performance:

    28nm vs. 14nm
    DDR3 bandwidth starved vs. dedicated eDRAM
    TDP lowered vs. stock TDP

    And still the AMD manages to reach 70% of the performance? This just shows that Intel’s GPU arch is still light years behind compared to the likes of Nvidia or AMD. They really need to step up their game with Skylake if they want to have any chance against the upcoming 14nm FinFet HBM chips from AMD.

    • Carl

      For mass-buyers. you are right. For most enthusiast who will buy a discrete video card anyways, Intel is still the way to go.

      • Anonymous

        Yep, no questions asked, but the Haswell chip is better than this. And who knows what Zen will bring, maybe the race will be closer again. Intel isn’t pushing CPU performance at all, that gives AMD some time to catch up.

      • DougLord

        Intel is the way to go for everyone. When was the last time you saw someone selling a PC with AMD CPU?