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1866 O.C ram ??

Hi all,

In advance excuse my noobiness

I am starting a new build and got an Asrock z77 Extreem 4 with a 3570k
I see that the mother board supports 1866 ram but in O.C.

I am looking to use G.SKILL Ripjaws X Series 8GB (2x4GB) DDR3 1866MHz CL9 Dual Channel Kit (F3-14900CL9D-8GBXL),
(which just so happens to be on sale and is cheaper then the 1600MHz)

Now at this point I am confused:
Will I need to manually overclock this ram to get it to 1866? Would it just be plug and play ? The spec voltage is listed as 1.5v so wouldn’t overclocking go over this voltage??

would it be better to just go with G.SKILL Ripjaws X Series 8GB (2x4GB) DDR3 1600MHz CL9 Dual Channel Kit (F3-12800CL9D-8GBXL)

Please excuse my cluelessness in advance.
4 answers Last reply Best Answer
More about 1866
  1. Best answer
    1866 is an OC frequency, so yes, you would have to OC your RAM to reach this setting. The voltage you're inquiring about is the voltage that G.SKILL used to during testing the F3-14900CL9D-8GBXL kit, when they set it at CL9 latency, or 9-9-9-27.

    As for plug and play, well RAM is P&P, but there are default values for DDR3 (as well as lower tech). By default, your mobo will probably read the RAM as 1600MHz 9-9-9-27 1.5V. To attain the 1866, you'll have to change the [Auto] setting to [Manual], which will open more settings, where you will see the frequency setting.

    Overclocking doesn't always require overvolting, but yes, you don't need to volt higher than 1.5.
  2. Thanks for the quick response.

    So to further clarify:
    If I was to stick with using F3-14900CL9D-8GBXL and did nothing in my settings it would just simply run like (F3-12800CL9D-8GBXL) ??

    The specifications list :


    CAS Latency 9-10-9-28-2N
    Capacity 8GB (4GB x2)
    Speed DDR3-1866 (PC3�14900)
    Test Voltage 1.5 Volts


    CAS Latency 9-9-9-24-2N
    Capacity 8GB (4GB x2)
    Speed DDR3-1600 (PC3�12800)
    Test Voltage 1.5 Volts
  3. Yes, most likely that RAM will run as 1600 without choosing manual or XMP settings profile to choose the correct speed in BIOS. Honestly, the amount of performance you'll get past 1600 is minimal, only really noticeable in benchmark results.
  4. Best answer selected by megaxyu.
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