i7-4700MQ (47 Watt) vs i7-4702MQ (37 Watt)

Discussion in 'Hardware Components and Aftermarket Upgrades' started by T2050, Jun 7, 2013.

  1. T2050

    T2050 Notebook Deity

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    Wondering about what would be actually better to get out of these two processors the i7-4700MQ (47 Watt) or the i7-4702MQ (37 Watt)?

    Taking into account the i7-4702MQ drops 200 MHz but is 10 Watt less than a i7-4700MQ should be pretty significant gain to battery life. Not only that should make for cooler running system.

    Although when I look at notebookcheck in their review, the i7-4702MQ thermal throttles due to the low TDP where as the i7-4700MQ does not and can stretch its legs. Then again the i7-4700MQ is in a test/review laptop with some pretty beefy cooling. The majority of notebooks will have pretty standard cooling in most consumer units. Therefore the i7-4700MQ may thermal throttle in most notebooks out there under load.

    http://www.notebookcheck.net/Review-Intel-Haswell-Processors.93189.0.html
     
  2. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    From what we've seen from SNB and IB, the idle power (and heat output) is so close to call it the same from the highest quad cores, to the entry level dual cores (not the ULV's of course) when running idle/light/normal workloads.

    Haswell will be the same within the Haswell lineup (and much better at idle than SNB and IB...).


    Given the above, what is your intended usage (normal/light usage?... or heavy/intense?) - with either scenario if you'll be 'plugged in' for the heavy stuff, I would get the 4700MQ. Again; with either scenario, I would be getting a chassis that is built properly for a high performance quad core. This will ensure that with either processor you choose, you will be able to use it fully and with no artificial throttling.


    So this means forget about the super sexy .5" (~12mm) notebooks - bigger in this case, is better (when performance, and hence, proper cooling matters).


    And yes; that 200MHz does make a difference - 9% is a generational improvement (and you can have it now and enjoy it for the life of the system).


    ...
     
  3. T2050

    T2050 Notebook Deity

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    Yeah they are pretty much the same around idle, seems to be a limit where no more power can be saved, or minimal wattage at ~800 MHz.

    I was expecting Haswell to have a much lower idle. Will be good if someone could post like a throttlestop screenshot (or the likes that shows power usage) of a Haswell mobile at idle.

    I going to use it for gaming on the couch at nights, (also want it for the touchscreen, but that really has nothing to do with the load). Bit worried about a 47 Watt quad working with a 750M gaming. It will be this year Envy 15 which is really this just a 2013 dv6, therefore I am expecting the usual slightly ok cooling system that usually end up high temps and in and out of throttling.

    Thinking about it I could use something like throttlestop to reduce the clock speed to that of a i7-4702MQ, thus use less power (which has worked with an earlier dv6 I had to stop it for over heatings). Though that will defect the purpose of having a faster CPU.

    There is a small premium to pay for the i7-4700MQ over the i7-4702MQ, keeps me thinking there must be some value in it?
     
  4. Maikky

    Maikky Notebook Consultant

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    Wondering the same thing .
     
  5. tijo

    tijo Sacred Blame Super Moderator

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    Faster clock speeds, it's also possible the 4702MQ might be missing features like V-Pro and VT-x or have a different IGP, you could look up the spec sheets on ark.intel. Intel has also been know to charge quite a bit for a small bump in clock speeds.
     
  6. Karamazovmm

    Karamazovmm Overthinking? Always!

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    they are the same cpus, the 4700 is the 3600 OEM cpus
     
  7. HTWingNut

    HTWingNut Mostly Harmless...

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    It's kind of like the Ivy Bridge i7-3610QM vs i7-3612QM, except the 3612QM demanded a significant premium over the 3610QM because it was a 35W quad core as opposed to a 45W.
     
  8. Meaker

    Meaker Company Representative

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    In a highend notebook you can just lower the TDP to 37W anyway lol.
     
  9. Kallogan

    Kallogan Notebook Deity

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    According to notebookcheck review about Haswell cpus, the 4702HQ seems to actually really consume less than 47 watts parts. It seems to be more significant than on 3612qm. I'd go for a 4702HQ and deactivate turbo boost to get more or less a 27W TDP. But that's just me, i hate noise and heat.
     
  10. Maikky

    Maikky Notebook Consultant

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    How easy is it to switch between throttling down when I'm just surfing and throttling back up when I need speed ? Throttling down will see a significant increase in battery life right ?
     
    coltsmild likes this.
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