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:

http://img214.imageshack.us/img214/118/cpuztk.th.png

Uploaded with ImageShack.us

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?

Thanks,

Phil
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

    BIOS:
    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"

    http://img411.imageshack.us/img411/1972/spd2.th.png

    Uploaded with ImageShack.us

    ***

    Second screen is for the Memory tab before making the changes

    http://img228.imageshack.us/img228/8337/memory1.th.png

    Uploaded with ImageShack.us

    ***

    Final one is for the Memory tab after making the changes

    http://img221.imageshack.us/img221/4620/memory2l.th.png

    Uploaded with ImageShack.us

    ***

    Your thoughts?

    Thanks,

    Phil
  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 !!!

    Phil
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