So, how big of a speed boost are we talking about here?

Discussion in 'iMac' started by Steve.P.JobsFan, Feb 20, 2012.

  1. Steve.P.JobsFan macrumors 6502a


    Jan 27, 2010
    This Saturday, I'm driving 85 miles to another State (Ohio to Michigan) to the Apple Store to get my new iMac. Here is the config I bought, which is the $1499 model.

    21.5-inch: 2.7GHz
    2.7GHz Quad-Core Intel Core i5
    1920 x 1080 resolution
    4GB (two 2GB) memory
    1TB hard drive
    AMD Radeon HD 6770M with 512MB

    Now, I had 8GB RAM delivered from Crucial today, so I'd actually have 12GB RAM instead of 4GB RAM. I'm coming from a 2007 20" iMac, also the $1499 model.

    20-inch: 2.4 GHz
    2.4GHz Dual-Core Intel Core 2 Duo
    1680 x 1050 resolution
    4GB RAM
    320GB Hard Drive
    ATI Radeon HD 2600 PRO with 256MB

    Here's what I'm usually doing on my Mac everyday.

    The usual stuff (Email, web, YouTube, Facebook, stuff like that)
    Gaming via Steam (Left 4 Dead 2, Portal, and another game I forgot...)
    GTA IV via Windows 7 Professional 64-Bit (BootCamp)
    Photoshop Elements work (Maybe twice a week...)
    Render and export 720p video via iMovie once a week.

    Since I'm gaining an extra two cores, I'm assuming the speed boost would just be double what I had on the old iMac?

    Comments appreciated.

    - Billy
  2. xxBURT0Nxx macrumors 68020


    Jul 9, 2009
    The Usual stuff is going to be about the same... might seem slightly faster.
    Gaming will see a decent boost, fairly significant GPU upgrade
    Gaming on windows will also improve
    Photoshop some renders and effects/layering will get done faster, better gpu could help if you deal with very large hi-res images
    Probably going to see the biggest difference here. Should be 2x+ faster than your old machine.
  3. MonkeyBrainz macrumors regular


    Feb 18, 2012
    That's not how it works. There are two RAM slots in that iMac, each using a 2 GB stick. You'd have 12 if the Crucial was one 8 GB stick and the iMac was using one 4 GB stick. If the Crucial is just one stick of memory the most you'll have is 10. If it's two 4 GB sticks you'll only have the 8 that you bought.
  4. applefiend95 macrumors regular

    Jan 25, 2012
    all of the iMacs have 4 slots.....:p
  5. Steve.P.JobsFan thread starter macrumors 6502a


    Jan 27, 2010
    That's what I thought! I was alarmed for a second! :eek:

    Thank goodness for your clarification!
  6. xxBURT0Nxx macrumors 68020


    Jul 9, 2009
    you can, but it's not recommended to run different ram in each slot. Might as well just buy another set of 4gb sticks to match, and have 16gb!!!
  7. mellofello macrumors 65816

    Feb 1, 2011
    I noticed a big jump in my Adobe programs going from core duo to i5. Basic web browsing won't really see much of a bump since a lot of that has to do with ping, and connection speed. I will say though that much to my surprise adding 16 gb of ram to my imac, has drastically improved my streaming video download. I cannot explain it but my computer will easily run 1080p videos, whereas before it would buffer and stutter. Same 10mbps dl speed.

    In that instance you may also see a bump.
  8. laserbeam273 macrumors 6502

    Sep 7, 2010
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

    Mine runs fine in the 12 GB configuration, and FCP X makes good use of it.
  9. MonkeyBrainz macrumors regular


    Feb 18, 2012

    My mistake. Got confused when I read the specs as 2 GB x 2 and the last iMac I owned had 2 slots.
  10. xxBURT0Nxx macrumors 68020


    Jul 9, 2009
    like i said, it WILL work, but is not recommended. Apple says: "For best performance, fill all memory slots, installing an equal memory module in each slot"

    Obviously you can install 2x4gb and 2x2gb, but if you start seeing problems that may be the problem. Just was letting the OP know.
  11. Jaxx macrumors newbie

    Feb 13, 2012
    Is it really true mixing ram cards (sizes) is bad?

    I've seen people post that they added 8gig of ram to the existing 2, 2gig chips for 12 gig total and it was great. Is this a mistake? If my imac comes with 2, 2gig cards and i want to add 2, 4gig cards, a problem?

  12. yashi macrumors member

    Oct 13, 2011
    Given the number of people here that have done it and had no issues at all (myself included), the likelihood of that happening is really low unless you use some really obscure brand of memory.
  13. xxBURT0Nxx macrumors 68020


    Jul 9, 2009
    it will work, apple just doesn't recommend it and some reports of kernel panics and such. Obviously people have done it with no problems, and it works fine, I was simply letting the OP know that it is not recommended to mix/match ram.

    ^^^ yeah 2 people in this thread... HUGE sample size haha

    I NEVER claimed it WILL happen, i said it COULD happen, and apple specifically says they do not recommend mixing ram. Take it for what you want, I'm just providing the information.
  14. forty2j macrumors 68030


    Jul 11, 2008
    Kernel panics? I've heard it was not recommend before, but that was because there's a performance boost associated with all 4 chips having the same size.
  15. throAU, Feb 21, 2012
    Last edited: Feb 21, 2012

    throAU macrumors 603


    Feb 13, 2012
    Perth, Western Australia
    You new machine will absolutely DESTROY the old one in terms of video transcoding.

    My i7-2720 based MBP 15 is so much faster than my core2 quad desktop at video encoding its not funny.

    depending on the workload, your new machine may be much more than 2x faster. in some tasks, it will be approximately the same however.

    going for 12gb instead of 16gb - you're maybe saving $20 (4gb DIMMs are about 20-25 bucks each?), and perhaps making the mac unable to access memory as quickly due to the memory slots not running in dual channel mode.

    don't screw around... spend the extra 20 bucks on upgrading to 16gb, you'll be glad you did.
  16. xxBURT0Nxx macrumors 68020


    Jul 9, 2009
    anytime you mess with ram or hdd you can experience kernel panics. Doesn't mean that it was or wasn't the ram, i'm just posting FYI. Obviously it can be done, as I've said, just saying RAM is so cheap, it's not hard to just spend an extra $35 and upgrade all 4 DIMM's to 4gb at once. Easier to do it all at once than taking your iMac apart again.

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