[Asus] Sabertooth 990FX help set memory Freq + Timing!!!

I recent purchased a Asus Sabertooth 990FX and based on reviews, knew that the board will by default recognize a Corsair Vengeance DDR3 (2x4GB) cas 8 1600 as cas9 1333. I was told this can be corrected with minor tweak to the bios, but I'm lacking in bios/hardware settings knowledge, so can anyone help me to correct this??

Currently in the bios advanced option, under Ai Tweaker, I can set the memory freq to 1600 myself, but the DRAM settings report cas9 by auto, do i just set the first 3 manually to cas 8 to solve this issue entirely??

Also, if anyone is familier with the Asus UEFI Bios utility, under Tool > Asus SPD Information, there is a JEDEC with the default (incorrect) memory settings, and then a XMP #1, with all the correct settings for the memory, should I be worried about this part?? What exactly is the XMP referring to and is that something I should enable (where?) to correct the memory problem. Thanks for your time guys!

P.S. in the DRAM settings there are a lot more options than just the 4 latency timings that I see on the memory spec, which is 8-8-8-24. should I be changing any of these?
11 answers Last reply
More about asus sabertooth 990fx memory freq timing
  1. Set the timings latencies to manual and input all the numbers according to your ram! XMP is a extreme memory profile and enabling it might set the ram correctly.
  2. The 990FX is AMD and so there's unfortunately no 'XMP' setting; XMP is just another 'JEDEC' setting e.g. 'XMP-1600' but it's an Intel feature and not AMD. There are several "Corsair Vengeance DDR3 (2x4GB) cas 8 1600" so to avoid a mistake please post a link to your exact set of Corsair.

    edit:
    Q - Are you planning to OC the CPU by FSB?
    Q - What CPU?
  3. jaquith said:
    The 990FX is AMD and so there's unfortunately no 'XMP' setting; XMP is just another 'JEDEC' setting e.g. 'XMP-1600' but it's an Intel feature and not AMD.

    I was scratching my head over that one but it looks like it appears in his UEFI like I read it.
  4. What's there to scratch your head over? I realize it's EFI doesn't change the fact that the AI Overclock Tuner lacks the 'X.M.P' {Intel} selection; the choices are Auto, Manual, & DOCP.

    ----
    Assuming CMZ8GX3M2A1600C8 http://www.corsair.com/vengeance-8gb-dual-channel-ddr3-memory-kit-cmz8gx3m2a1600c8.html and NO CPU OC:
    1600 MHz 9-9-9-24-2N (CAS-TRCD-TRP-TRAS) @ 1.50v

    BIOS:
    Memory Frequency -> DDR3-1600 MHz
    DRAM Timing Control /Enter
    CAS -> 8
    TRCD -> 8
    TRP -> 8
    TRAS -> 24
    --
    Command Rate -> 2

    DRAM Voltage -> 1.5v

    Save & Exit = Yep!
  5. CMZ8GX3M2A1600C8R http://www.newegg.com/Product/Product.aspx?Item=N82E16820233185&cm_re=corsair_vengeance-_-20-233-185-_-Product

    AMD Phenom II X4 955 Black Edition http://www.newegg.com/Product/Product.aspx?Item=N82E16819103808&cm_re=phenom_ii_x4_955_black-_-19-103-808-_-Product

    Planning for some moderate OC on the CPU later.


    jaquith said:
    The 990FX is AMD and so there's unfortunately no 'XMP' setting; XMP is just another 'JEDEC' setting e.g. 'XMP-1600' but it's an Intel feature and not AMD. There are several "Corsair Vengeance DDR3 (2x4GB) cas 8 1600" so to avoid a mistake please post a link to your exact set of Corsair.

    edit:
    Q - Are you planning to OC the CPU by FSB?
    Q - What CPU?
  6. Then use what settings I posted above :)
  7. Thanks for the inputs, I went ahead set the timing settings and freq. like you posted and it appears to reflect now, the correct memory settings, CPU-Z displayed my memory module running at cas 8-8-8-24 now. What is the difference between command rate 1T vs. 2T?? I am running 2x4GB of the memory module.


    jaquith said:
    What's there to scratch your head over? I realize it's EFI doesn't change the fact that the AI Overclock Tuner lacks the 'X.M.P' {Intel} selection; the choices are Auto, Manual, & DOCP.

    ----
    Assuming CMZ8GX3M2A1600C8 http://www.corsair.com/vengeance-8gb-dual-channel-ddr3-memory-kit-cmz8gx3m2a1600c8.html and NO CPU OC:
    1600 MHz 9-9-9-24-2N (CAS-TRCD-TRP-TRAS) @ 1.50v

    BIOS:
    Memory Frequency -> DDR3-1600 MHz
    DRAM Timing Control /Enter
    CAS -> 8
    TRCD -> 8
    TRP -> 8
    TRAS -> 24
    --
    Command Rate -> 2

    DRAM Voltage -> 1.5v

    Save & Exit = Yep!
  8. To guess - listen to what I say; ~<1% but more stable

    To know - run something like Super PI; let me know and then Prime 95 and/or any stress test you can throw at it ;)

    Super PI -> http://virgilioborges.com.br/hyperpi/

    Also, anytime you tweek your RAM also run Memtest86+, create a bootable CD/DVD, download the ISO/zip file, and run at least 2-passes -> http://www.memtest.org/
    note: 8GB 4-passes takes quite a while...
  9. Here's an oldie but goodie article from Tom's about memory.

    http://www.tomshardware.com/reviews/pc-memory,1698.html

    Hi jaquith.
  10. Hey everyone. Can anyone give me the settings for the http://www.newegg.com/Product/Product.aspx?Item=N82E16820233147&Tpk=CMZ8GX3M2A1600C8 please? I have the same board as original poster.
  11. b4w said:
    Hey everyone. Can anyone give me the settings for the http://www.newegg.com/Product/Product.aspx?Item=N82E16820233147&Tpk=CMZ8GX3M2A1600C8 please? I have the same board as original poster.

    I am expecting NEARLY the exact same ram (CMP8GX3M2A1600C8) in two days and and the Sabertooth comes tomorrow. I too would be appreciative with help setting this stuff up. Thanks in advance!

    The ram is 8-8-8-24 1.65v
    I will not be overclocking at this time. I don't know how. Yet.
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