Moving From Intel Ivy Bridge 3770K to Intel Broadwell 5775C

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Broadwell Power & Temperatures


One of the reasons we updated our Ivy Bridge system to Broadwell was to get better efficiency at idle and light workloads, so we were hopeful that we’d see some power savings. With the system turned off and just plugged into the wall we found the new Broadwell platform consumed 1.4W of power while the old Ivy Bridge system used 0.8W of power. We are off to a bad start! With the  systems up and at idle with two displays plugged into each board we found the Intel Core i7-5775C Broadwell platform used 39 Watts of power versus 53 Watts on the Intel Core i7-3770K Ivy Bridge processor. This is a 26% reduction in idle power and is exactly what we were looking for! At load the 5775C and Z97 platform used 143 Watts, which is more than the 125 Watts of power used on the 3770K and Z77 platform.


The CPU Temperature at an idle was a very respectable 27C with the case doors on and in a room that was 24C. We were a little concerned due to the fact that the airflow isn’t the greatest, but the idle temperatures on the Intel Core i7-5775C Broadwell 14nm processor were impressive thanks to the NZXT Kraken X41.


When running Prime 95 64-bit we had the CPU loaded up at 100% and the temperature peaked at 70C, but was often at around 68-69C and there was no thermal throttling!


Recovery time was pretty unreal as we went from 70C to 31C in under 10 seconds! We are using the pre-applied thermal paste on the NZXT Kraken X41 CPU cooler and will later try changing that out with other thermal material and to ensure that CPU cooler is fully seated as we didn’t expect to see a ~40C temperature drop that quickly!

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  • actually the very best gaming cpu on the planet still when paired with a 1080ti or Titan Xp. Boy, did you guys ever goof this one up!
    Or, more likely were paid by Intel to sabotage this awesome gaming cpu. WHAT a shill.

  • Shadownet

    Oddly enough, 6 months later and they all did make high end DDR3L kits, up to at least 2133 from Corsair. They’re more expensive at the moment than the DDR4 kits… so their point is kind of moot except for those who are still on older systems and want the low voltage for a later incremental upgrade, but if prices and availability are any indication, they’re going to not be available for much longer.

  • Grinder

    Love the hate people give. Other people spend money and give you a review for free and you have a negative comment. If Legit Reviews want to spend $1330 on a new office computer , then they can. Obviously they are after the Iris Pro and not a dGPU. I wish people could keep their stinking negative opinions to themselves. One thing wrong with this world, too many ****ing opinions.

  • MoogleStiltzkin

    also though you specifically mention this was a case scenario from ivy bridge 3770k to a broadwell, though interesting, it would also be nice if you had made a 2nd scenario for a more typical gamer user.

    the integrated graphics doesn’t do much for gamers. so skylakes lack of isn’t really an issue. also like ano mentions it’s better anyway.

  • anonomous72663

    $1330 for ~10% improvement, or get a dedicated graphics card for $300 and a 500% improvement in the graphics performance. Your conclusion should have stated, take the G card option, upgrading anything else would be the behavior of a madman – utterly pointless.

    • Yar Nunya

      Obviously you can read, maybe you’re just too dense to read it all… This machine is for office drone duty. Why would you need a $300 GPU to run office apps?

      • Virtual Insanity

        I agree with the $1330 for 10%
        The article only states that the ability to drive a 4K display was the only real thing lacking.
        An $80 discrete graphics card would have done the job.
        i7 and water cooling for what is admitted to be an office machine?

        Efficiency counts for more than just watts of power drawn from the wall.
        Superfluous upgrading is far from efficient, encouraging the manufacture of goods unnecessarily.

        Appreciate the content, but feel the point is lost, not sure what is trying to be achieved.