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i7 vs. i5 for Lightroom

Dec 3, 2009 7:56 AM

Good morning. I'm trying to choose between two new iMacs. One has the i5 processor and the other would use the i7 with the hyperthreading. If my focus is Adobe Lightroom as opposed to, say, high graphics intensive games, would the i5 work nearly as fast as the i7 or would LR take advantage of the i7's additional features? Any other significant real world advantage to the i7? Most of what I read involved test suites which may or may not be relevant to LR per se. Thanks much, Andy

 
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    Dec 3, 2009 4:15 PM   in reply to Andy8400

    hi,

     

    according to macworld there is only an 8 percent speed gain for the i7 over the i5.  i am not really sure you would see a huge advantage.  however, this partly depends on what kind of work you intend to do i.e. HDR etc.  if you are mostly doing standard photo editing stuff it won't be something you will really notice.  but the usual advice for buying a computer applies - buy the best you can afford.  this is even more true for the all-in-ones.  if it were me i would go with the i5 and add more RAM at a later date (this will help with large file sizes).  8 Gigs would do nicely here.

     

    hope that helps,

     

    photoj

     
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    Dec 4, 2009 6:48 PM   in reply to Andy8400

    hi,

     

    no problem.  i also had a look at the speed scores for the various tests on macworld for the CS4 test it was a dead heat between the i5 and the i7.  this is only a guess, but i think that is the kind of performance you will get with LR as well.  the only exception might be when it comes to rendering previews of imported photos.  if you look at that and the other tests (aperture test), it will give you a pretty good idea of what to expect (small gains at best).  but if you are in a work environment where seconds count, than i would actually suggest getting a mac pro.  you will be thankful you did.  with the mac pro you can easily add more hard drives and it generally has a lower part failure rate (the iMac well good, is just a glorified laptop).  it is also cheaper to fix in some cases.  if the GPU goes on the iMac you need to get a new logic board.  if it goes on a mac pro you just get a new GPU because it is on its own board.  you will also be able to get more productive use out of the mac pro because it is easily updated.  about the only things you can upgrade on the imac are the ram and the hard drive.

     

    anyway, hope that helps.

     

    regards,

     

    photoj

     
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    Dec 5, 2009 6:33 PM   in reply to Andy8400

    hi andy,

     

    if you are "only" shooting your grand kids and such i think you will be very happy with your choice.  as i said the CS4 test results for the i5 and i7 were identical.  sorry if i got a little long winded, i just wanted to cover all the bases as you did not indicate to what use you would be putting your machine.  for armatures, semi-pro and pros just starting out the i5 imac is a perfectly fine choice.

     

    i have been a mac user for nearly untold years and i currently own a macbook pro 2.8 ghz.  as a professional photographer i can tell you that it eats lightroom and photoshop for breakfast (the only time i have noted a slow down is when using the graduated filter).

     

    my only suggestion would be that before you install all your new software and so on, that you wipe wipe the hard drive (write to zero) and re-install the OS.  then fix permissions.  this will stave off any potential issues and make the OS very stable (the OS install that the factory does is not very good).  if you don't know how to wipe the drive and write zeros over, just call apple tech support and they will help you.  or go on the apple support boards.

     

    good luck with your new machine and happy holidays!

     

    photoj  

     
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