i7-4700 2.4GHz vs i7-4702 2.2GHz

Discussion in 'CPUs and Overclocking' started by DAGTA, Sep 29, 2013.

  1. DAGTA

    DAGTA Diamond Member

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    I'm looking at two laptops. The only difference between them is that one has the older i7-4700 clocked at 2.4GHz and the other has the newer i7-4702 clocked at 2.2GHz.

    What I've read suggests that the newer i7 will run cooler, but a bit slower at the lower clock speed.

    Everything else being the same, I'm wondering what opinions would be on which cpu to choose. Also, are there other differences I'm not aware of?

    Thanks!
     
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  3. Fox5

    Fox5 Diamond Member

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    It's not that one is newer or older.
    The 4702 is a slower but lower voltage processor to conserve battery life. The 4700 is slightly faster but has higher voltage and so consumes more power.


    I haven't seen any actual comparisons between the two. In theory, the 4702 will run cooler and have longer battery life. Additionally, it may be able to hit its turbo speeds longer than the 4700. That's if the laptop chassis and cooling is the same, the manufacturer may use a smaller/lighter chassis for the 4702.
     
  4. DAGTA

    DAGTA Diamond Member

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    Thank you, Fox5! I'm not concerned about battery life as this laptop will be a desktop replacement that can also play games.
     
  5. Roland00Address

    Roland00Address Golden Member

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    Like Fox5 said they are the same cpu originally but they been tweaked a little by intel to give variety to the original equipment manufactures. By have two chips with different thermal profiles (tdp stands for max thermal design power) they can allow OEMs to design different types of laptops.

    For example with the i7 4702 you can have a very thin gaming laptop such as the razer blade (0.88″ thick) or msi gs series (0.85" thick).
    Compare this to the Lenovo Y500 (1.40" thick), MSI GE70 (1.54" thick), MSI GT70 (2.17" thick), ASUS ROG G750JW (1.97"), etc all of which are using the i7 4700.
    These gaming laptops are marketed to completely different people. They get similar cpu performance, by having a 35w tdp sku though OEMs can design sub 1" thick gaming laptops while with the 45w sku they have to make the laptop greater than 1" thick.

    So don't worry too much about the i7 4700 vs i7 4702, worry more about the final product like gaming performance, screen, cooling, weight, size, etc.
     
  6. DominionSeraph

    DominionSeraph Diamond Member

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    You have that backwards. The 4700 has higher TDP overhead so it will be able to maintain turbo longer.
     
  7. Roland00Address

    Roland00Address Golden Member

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    So time for some numbers. The first two numbers are unrealistic non real world hypotheticals to give you an idea of a range.

    So assuming for some reason turbo was turned off we have a 2.4 ghz quad core vs a 2.2 ghz quad core or a difference of 9.1%

    So assuming turbo works perfectly well and you are always running the cpu at the max turbo since you have perfect cooling, and intel has perfect sensors with perfect software. In such a situation the i7 4700 works like this.

    Max Turbo for i7 4700MQ: 3.4 ghz max single core, 3.3 ghz max dual core, 3.2 ghz max tri core or quad core.
    Max Turbo for i7 4702MQ : 3.2 ghz max single core, 3.1 ghz max dual core, 2.9 ghz max tri or quad core.
    % difference between i7 4700MQ and i7 4702MQ: 6.3% single core, 6.5% dual core, 10.3% tri or quad core.

    These numbers I just posted are not real world for in those numbers turbo does not work at all or it works perfectly.

    ------------------------------------------------

    Now in real life one laptop with the same chip may work differently than another laptop with the same chip due to the manufacture cooling. If the chip gets better cooling in theory it can turbo to higher states and stay within turbo for longer periods of time and thus perform better. Also even if you get identical model number chips one may perform slightly better than another due to how turbo works since in real life not all chips work perfectly the same with voltages and such.

    The next numbers are from notebook check and they take an average of different laptops. They still give you an idea.

    Intel Core i7-4702MQ
    Cinebench R11.5: CPU Multi 64Bit: min: 5.22 avg: 6.6 (54.26%) max: 7 Points
    18 laptops tested
    Cinebench R11.5: CPU Single 64Bit: min: 1.27 avg: 1.5 (78.68%) max: 1.54 Points
    18 laptops tested
    3DMark Vantage: P CPU no PhysX 1280x1024: min: 17910 avg: 22083.5 (59.71%) max: 23868 Points
    19 laptops tested

    Intel Core i7-4702MQ
    Cinebench R11.5: CPU Multi 64Bit: min: 5.89 avg: 6.2 (51.15%) max: 6.36 Points
    5 laptops tested
    Cinebench R11.5: CPU Single 64Bit: min: 1.4 avg: 1.4 (74.13%) max: 1.43 Points
    5 laptops tested
    3DMark Vantage: P CPU no PhysX 1280x1024: min: 20151 avg: 20981.3 (56.73%) max: 21482 Points
    4 laptops tested

    So taking the averages in Cinebench R11.5 multi threaded we see a difference in real world of 6.5%, 7.1% in single threaded, and 5.3% in 3dMark Vantage cpu test

    ------------------------------------------------

    Like I said before don't worry about the chips they perform similarly in real world usage where you won't be able to tell the differences between the two without using benchmarking tools. Even with benchmarking tools we are talking less than 15% difference and more like 6 to 7% difference.

    Other factors of your laptop buying decision should be influencing your final choice.

    Not necessarily while the chips with the i7 4700MQ have a higher tdp maximum and thus can stay within the acceptable tdp in turbo mode for longer, the chips with the i7 4700MQ are also more likely to be a slightly higher voltage. Intel will put these chips at a slightly higher voltage due to binning and wanting to make sure these chips hit their guaranteed values. Thus it can work both ways.

    Don't get me wrong, I believe the i7 4700MQ will perform better than an I7 4702MQ on average, but there are a lot of factors in play and it depends on what chip you get from intel and what does the laptop designer choses with cooling.
     
  8. DAGTA

    DAGTA Diamond Member

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    Thank you Roland00Address and DominionSeraph!
     
  9. DAGTA

    DAGTA Diamond Member

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    Thank you for the analysis, Roland!

    In this instance, everything else is the exact same: same chassis, same cooling, same size. The only difference is the CPU.
     
  10. Roland00Address

    Roland00Address Golden Member

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    Price is the same?

    Seels like you have picked out the laptop you want for sure. If the price is the same I would do some research on the model you are about to buy and how well is the cooling. If it is great cooling get the faster i7 4700MQ. If the cooling is not great get the i7 4702MQ so you will have a cooler laptop. The cpus perform extremely similar for originally they are the same chip.
     
  11. DAGTA

    DAGTA Diamond Member

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    Thank you!

    Yes, the 4700MQ is the older stock and the 4702MQ is the newer stock. Otherwise, the exact same. Price and all.