Any benefits of going lower latency than CL5 for iMac Intel?

Discussion in 'Buying Tips and Advice' started by irock, Jan 23, 2006.

  1. irock macrumors member

    Jan 8, 2004
    Hi I checked with several sources and they all say iMac Intel stock RAM is CL5 DDR2 667Mhz. I was wondering if I'll get any speed advantages for upgrading to DDR2 667Mhz CL3...

    Thanks for your help.
  2. nutmac macrumors 68030

    Mar 30, 2004
    Where did you find CL-3 DDR2 PC2-5200 SO-DIMM?
  3. robbieduncan Moderator emeritus


    Jul 24, 2002
    All your RAM will run at the speed of the slowest stick. So unless you are going to remove and replace the stock RAM then there will be no difference. In normal day-to-day usage you will not see any difference between CL3 and CL5. Playing games you might see 1-2 fps difference at most. Probably even less than that.
  4. T-Stex macrumors 6502

    Jan 15, 2006
    I'm curious as to where you found CL3 RAM for the new Intel Macs. I haven't seen it anywhere, and I'm guessing it's much more expensive than CL5. I am, however, guessing that the performance increase you'll see if you were to upgrade both sticks to CL3 probably would not be worth the price.
  5. irock thread starter macrumors member

    Jan 8, 2004
    oh ok... my guess is that a lower CL is better in situations like overclocking...

    anyway, i will get whatever that is available on Crucial. I couldn't find any 667Mhz RAM in HK.
  6. irock thread starter macrumors member

    Jan 8, 2004
    It's a company called SyncMax... some local memory company in HK i guess.

    Anyway, that's not SO-DIMM... I thought iMac Intel uses DIMM... turns out it also uses laptop's SO-DIMM.
  7. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    All DDR-2-667 MHz SODIMMs currently are CL5, that is standard.

    DDR2-533 is CL4
    DDR2-400 Can be CL4 or CL3

    Maybe the industry will come out with faster components to allow lower CAS Latency performance in the future. It;s a little up in the air to what extent Apple motherboards will be able to exploit lower CAS latency: there is no BIOS of course to manually set the memory timings, so we would have to rely on Apple building in the capability to automatically detect and reconfigure the motherboard timings.

    IN any case, it is unlikely to be worth spending mad amounts of money on advanced RAM, and I would certainly look with skepticism on a small seller claiming performance beyound industry standards... given that all modules have to use chips from the same 4 or 5 foundries...

    As usual: choose your Mac RAM from a reputable dealer who tests and guarantees compatibility with your model Mac, offers a lifetime warranty and a no-cost return if it does not work. This would generally exclude eBay, overseas and discount store purchases.
  8. irock thread starter macrumors member

    Jan 8, 2004
    Looks like Crucial has it... I will get it from them since they can ship to HK.

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