DDR 3 1066MHz to 1333, worth the upgrade?

Discussion in 'Mac Pro' started by djjaes, Jun 29, 2015.

  1. djjaes macrumors member


    Jan 24, 2015
    US South
    I have read (although I cannot link to such a post or website as it has been some time since I read that information) that the difference between 1066MHz to 1333MHz is little besides the obvious difference in speed/MHz.

    With you all's experiences (I have been able to learn many new things about my Mac Pro 5,1) as a guide I have upgraded my 2010 5,1 2.8 four to a hex 3.33.

    I am looking to up my memory (to 32 or 48GBs), but I am a bit confused, or rather, on the fence whether I should stay with the DDR3 1066Hz or switch to 1333.

    To my question for this august body of users, I ask is the speed/performance difference worth switching?

    Mac Pro 2010 hex 3.33
    24GB DDR3 1066MHz (PC3-8500)
    HD7950 3GB
    OS X 10.10.3

    Everyday computing
    Light gaming (although nonexistent these days)
    Writing novels
  2. Inutopia macrumors 6502


    Apr 8, 2009
    South of Heaven
    If you're replacing all the ram for this upgrade, then sure, use the 1333MHz. But if you would be getting rid of the 24GB just to get that small increase, don't bother.

    You can mix the 1333 and 1066, they'll just both run at 1066.
  3. 1080p macrumors 68030


    Mar 17, 2010
    Planet Earth
    Sorry to thread jack, but since this is a RAM related thread... anyone know of the cheapest place to buy 1333 ECC memory with the Apple approved thermal sensor?
  4. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    Same suggestion, unless you plan to replace all the RAM sticks, then there is no reason why not go for 1333.

    However, that should be due to increase RAM size, but not RAM speed.

    The real world speed difference usually less than 1%. By considering there are lots of other factors keep affecting your computer's performance. I will say there is no way that you can tell the difference.
  5. djjaes thread starter macrumors member


    Jan 24, 2015
    US South
    That is what I was thinking. I have 2x8 GB cards and 2x4 GB cards. It would be more cost effective for me to just replace the 2x4's with two more 8 GB cards.
  6. flehman macrumors 6502


    Feb 21, 2015
    You could still buy the 1333-rated memory in case you decide to switch over in the future - it wouldn't hurt anything to run at 1066 in the meantime.

Share This Page