Help, i7-640m vs i7-820qm

Discussion in 'Hardware Components and Aftermarket Upgrades' started by tecton, Nov 8, 2010.

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  1. tecton

    tecton Newbie

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    Dear guys

    I want to buy new laptop, and finally there are two alternatives. Both of them are local brand.

    1st choice
    i7-820 + gt 335 1 gb
    pros= better proc (?) and gpu
    cons = shorter battery time + more expensive (more USD 100)


    2nd choice
    i7-640 + gt 330 1gb

    Guys, is it really worthmoney to spend USD 100 to get 1 st choice?
    Both of them still in my budget.

    I want to use it for my simulation and my excel ( lot of data with long iteration). It will be proc intensive. Unfortunately, I dont know my simulation application support for 4 core.

    Please, I need your opinion


    Thanks alot
     
  2. NotEnoughMinerals

    NotEnoughMinerals Notebook Deity

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    surprisingly enough, microsoft excel iirc is one of those programs that great benefits from the use of multiple cores so if your excel sheets really are that intensive you'll really see a difference.

    if memory serves the 335 is pretty good bump over the 330 so I'd recommend the 820qm + gt335 as long as your not in dyer need for battery life.
     
  3. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    Even if Excel 2007 and above were not multi-threaded,

    Source:
    Multithreaded Recalculation in Excel


    If you plan on keeping this system for anything over a year $100 will be insignificant to how well it will handle future O/S's and apps.

    Go for the 4 core, 8 thread i7-820 - and, buy an extra battery too - if you need the un-tethered run time. ;)

    Nice system!
     
  4. tecton

    tecton Newbie

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    Thanks a lot for opinion, so I should buy the 1st choice.
     
  5. Tsunade_Hime

    Tsunade_Hime such bacon. wow Super Moderator

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    Yes, for 100 bucks more you are future proofing yourself.
     
  6. Trottel

    Trottel Notebook Virtuoso

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    Yeah. The theory of future-proofing is nonsense. But since you should see a real-world improvement in performance and possibly a longer useful lifespan with what you are using it for, it is money well spent. And if you ever sell it, you would probably make back a lot of the $100 price difference anyway.
     
  7. Kaso

    Kaso Notebook Virtuoso

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    $100 is not small or easy money. I don't believe the 820 will give you a noticeable boost in performance. If I were you, I would save the $100 for an eventual RAM upgrade or SSD upgrade.

    Excel uses a lot of RAM for big spreadsheets, and if there is not enough, "paging" will be involved to extend the RAM virtually. Lots of swapping using a mechanical disk drive while the powerful CPU sits waiting is not a very good prospect.

    I see no real advantages, in your case, of the quad-core 820 over the dual-core 640. in fact, even if I went with a 640, I would ask myself very hard why not go with, say, an i5-560.
     
  8. Hungry Man

    Hungry Man Notebook Virtuoso

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    I agree with Kaso. I personally would be more than satisfied with the 640m and wouldn't pay so much more for the 820qm. That's just me. I don't think you'll notice a difference with excel and if you spent that 100 bucks on a faster hard drive or more RAM and paired it with the 640m you'd really feel it... throughout the entire system.
     
  9. tecton

    tecton Newbie

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    Unfortunately, the option just two of them. No processor custom here.

    In my previous post, I mentioned that I will run simulation. For more specific, I run oracle Crystall Ball addin for my ms excel, Schlumberger Petrel and Schlumberger Eclipse. It takes hours to complete.

    Basically, I will buy 1st choice but chek the link below

    Intel Core i7 640M Notebook Processor - Notebookcheck.net Tech


    You'll find that I7 640 m, sometimes mightier in some tests. What about that?
     
  10. Judicator

    Judicator Judged and found wanting.

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    If you mean why the i7-640M is better in some tests than the i7-820QM, it depends on the program being run. Single-threaded programs that stress very few cores will run faster and better on the i7-640M because of the way it's structured/arranged (faster 2 cores). Programs that are well-threaded and better at the utilization of multiple cores will run better on the i7-820QM (4 slower (than the i7-640M) cores).
     
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