Broadwell: Intel Core i7-5775C And i5-5675C Review

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Power Consumption Overview

Power Consumption Overview

An overview of power consumption confirms what we saw on the previous page. Comparing the two new processors to other CPUs and APUs shows the magnitude of Intel's optimizations.

Unfortunate outliers, such as AMD’s FX-9590 (under load) or the FX-4350 (at idle) are just one piece of the puzzle. If you're wondering why the Core i7-5960X looks almost like a low-power processor by comparison, remember that most of these CPUs operate close to their sweet spots, whereas AMD's larger FX models and a few Intel CPUs don't run efficiently, even at their stock settings.

There are a lot of CPUs in the charts that follow, spanning a wide range of the performance (and power consumption) spectrum. As you can see, Intel's two new processors consume a lot less power than the previous models at idle, which makes for a great start.

Broadwell sets new power consumption standards for gaming with a discrete graphics card as well. The reason for this is the Iris Pro's almost nonexistent draw. Other CPUs with on-die graphics engines tend to lose some power through them.

The two new processors do well, even under full load and with a fully active IGP. They consume significantly less power than comparable older models, in spite of providing equal or better performance.

Bottom Line

Intel's previous-gen and AMD's current architectures drive home how impressive the Broadwell design is, and how far Intel has come with it. Although integrated graphics is often derided, we're seeing the company's emphasis on dedicating more resources to graphics paying off in a big way. Based on our power consumption results, Intel's balance of host and graphics processing is a resounding success.

Chris Angelini
Chris Angelini
Chris Angelini is an Editor Emeritus at Tom's Hardware US. He edits hardware reviews and covers high-profile CPU and GPU launches.
246 Comments Comment from the forums
  • RNOblivion
    Proof read your articles. This seems to be an increasing prevalent theme of Tom's over the last couple years.
    Reply
  • greghome
    are these numbers real?.............Not only does it match lower mid range cards, but it completely destorys AMD's APUs........
    :shock:
    Reply
  • Nuckles_56
    With the Sandra 2015 benchmark on the first page, you are testing the i7 7557c against the i7 4790k instead of the i7 5775c
    Reply
  • babernet_1
    Sad how AMD is absolutely shoved into the dust bin. I hope their upcoming Zen next year will be worthwhile with its 14nm process and more Intel-like cores.
    Reply
  • wtfxxxgp
    This is exactly what I said to a buddy of mine about a month ago. Everyone is going on about how little Intel has done with CPUs over the past few years - presumably due to no real competition from AMD. Then people starting looking to Zen as being the real competitor for Intel and saying things like "Intel are in for a shock" - I had the view that Intel weren't resting on their laurels all this time - they've just been biding their time and doing amazing things in a hush hush manner. When Zen is released it will soon be completely obliterated by some of the tech that Intel would have been working on in the meantime - AMD has lagged too far behind for too long and love them or hate them, Intel is the benchmark when it comes to CPUs - period. They own this space, and these 2 chips have just rendered AMD APUs completely useless now. I'd be interested in this for a HTPC solution with some light gaming - League of Legends etc. This is impressive, however, like the article concluded, what a poor time for them to be released.
    Reply
  • Grognak
    Wow. 93% better average framerate in GTA V than a 7850K with DDR3-2400 RAM... And that's just the i5. Incredible.
    Reply
  • shrapnel_indie
    Since Broadwell is unlocked, would have been interesting to see how they overclocked. Yeah Skylake is breathing down the neck of Broadwell now thanks to the delays it suffered... but still would be fun to see.


    You’ve waited this long—why not hang tight for a few months for Skylake and start anew with 100-series chipsets, DDR4 and the return of unlocked 95W K-series CPUs?

    Last I heard Skylake was supposed to support DDR3 and DDR4. Was that just a rumor that wasn't the truth or will it actually support DDR3 as well?
    Reply
  • alpha27
    heh iris coming close to a 750gtx 500 cuda core NVidia better watch out hey
    hmm if intel whacked a few iris's on a gfx chip and did there thing they could possibly beat NVidia...and make even more money lol, hmm mutli 128mb ring buses and iris core's and hbm...delicious
    Reply
  • de5_Roy
    it's a good review. two big reviews back to back, nice job. :)

    i missed some things:
    unlocked broadwells but no o.c. not even a little look into how these overclock and behave o.c.ed.
    no comparison (gaming, power use, htpc etc.) with the desktop haswell i5 and i7 -R cpus' iris pro igpus. the amd comparisons were good though. i hope you guys test these against the haswell iris pro later.


    in some of the charts, the core i7 5775 was written as i7 7557.
    in the test setup page, system memory section, is it "transcend" instead of "transcent"?

    edit:
    one last thing: do these unlocked broadwell cpus really have 16x gen 3.0 lanes off the processor? i thought these were soc dies (with southbridge disabled) with 8x gen 3.0 lanes.
    Reply
  • SteelCity1981
    not surprising given that it has an irs pro gpu in it, that's intel top of the line gpu. now obv even with that said it's in no competition with highend gpus from NVidia or amd as any apu's gpu would get destroyed, but what's good is the fact that it's helping to push gpus on apu's to become better and better and since intel has greatly stepped up their game in the apu's gpu department i'd expect amd to step up their game even further and push back. I also see that since there is such a big gain with broadwells gpu, that skylake won't see any real jump in that department. i'd imagine that the irs 6000 series is going to carry over onto skylake with little improvement over broadwells irs 6200.
    Reply