Memory not as fast as advertised

Hi all,

I just rebuilt my comp this weekend and for the new core component I purchased:

-AMD Phenom II x6 1090T 3.2
-Asus M5A97 EVO
-Sapphire RAD 6870HT
-Corsair Vengeance DDR 3 8GB (2x4GB) full produc ID: CMZ8GX3M2A1866C9

Now on the back of the mobo's box the memory specs are: 4xDIMM, Max 32GB, DDR3 2133(O.C)/1866/1800/1600/1333/1066 MHZ

In CPU-Z, under SPD if I look at Channel 2 and 4 they both state the same:

Uploaded with

Since it is dual channel I would assume that with both module my actual speed is at 1333mhz.

How could this be?...more importantly how can I make it go up to 1866mhz?


8 answers Last reply
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  1. The Default SPD is indeed DDR3-1333 with 1090T, and even with Zambezi FX-series the default is the highest JEDEC up to DDR3-1866 and XMP is not a JEDEC standard it's Intel's version of 'SPD'.

    Problem, in order to set the RAM Frequency >DDR3-1333 even on the 6-core AM3 you'll need to both manually set DRAM Frequency AND the FSB 240MHz (OC) or CPU-NB Frequency to 2400MHz or use ASUS's DOCP.

    RAM DDR3-1866 9-10-9-27-2T @ 1.50v

    AI Overclock Tuner -> DOCP
    Memory Frequency -> DDR3-1866MHz ; this speed 'should' be available if not then FSB is required**
    DRAM Timing Control /Enter
    DRAM CAS -> 9
    DRAM RAS -> 10
    DRAM RAS PRE -> 9
    DRAM RAS ACT -> 27
    DRAM Command Rate -> 2T

    Save & Exit = Yes

    Now since the kit is 1.50v the DRAM Voltage and CPU-NB Voltage are 'typically' not required. ** IF DDR3-1866MHz is not available in the menu then I'll post the alternative method of FSB (OC).
  2. Thanks Jaquith, I will give your solution a whirl later on today and post back the results.

    Thanks !
  3. Good let me know. BTW - I edited the two paragraphs above for better clarity.
  4. Well that was easier than I thought, switching ti DOCP I then click on Profiles and there was already a 1866 DDR3 9-10-9-27, I only had to switch the command rate to 2T.

    Ok so here are some screens, first one is for the SPD tab in CPU-Z, before and after are identical so I just uploaded the "after"

    Uploaded with


    Second screen is for the Memory tab before making the changes

    Uploaded with


    Final one is for the Memory tab after making the changes

    Uploaded with


    Your thoughts?


  5. My thoughts are you're good! :) The RAM is running 1878.4MHz (2 * 939.2) {DDR3 = Double Data Rate rev 3}; the variance is the FSB which normally bounces up and down slightly due to CPU load.

    IMO - I always set the CAS Timings (CAS-TRCD-TRP-TRAS-CMD) manually, to avoid BIOS goof-ups. However, both the Frequency and CAS look correct nonetheless.
  6. Nice!

    It's always good to have what I actually paid for :)

    So I guess that if my system ever becomes unstable I should just reset the DOCP back to it's original settings then?
  7. DOCP by itself won't (shouldn't) cause a problem. At some point if you decide to OC the CPU then the idea is essentially the same, but AI Overclock Tuner -> Manual, OC Tuner, CPU Ratio, CPU Voltage, DRAM Frequency, etc.

    IMO I would save the Profile you have now; see page 3-27 of the manual.

    To 'reset' the best place to start is 'Load Optimized Defaults'; see page 3-28. Worst case if things get to the point of 'Post Failure' use the Clear CMOS procedure; see page 2-16.

    Good Luck! :)
  8. It's all gold Jacquith, thanks so much for your help today.

    I am not the OC type, it's the first time I've OC'd anything, still I will keep the post in my archives just in case.

    Thanks again !!!

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