Corsair vengeance 2x4gb cant get up to 1600mhz

i have a corsair vengeance 2x4gb 1600mhz, fx-8120 @ 3.8ghz (19x200) and 990fxa-ud3 gigabyte mobo...

I cant get my ram to 1600mhz, its at 1333 and when i change to 1600 it says bad voltage on bootup and changes back.
Ive tried manually and via. profiles, whatsup ?
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More about corsair vengeance 2x4gb 1600mhz
  1. Run memtest on each stick one at a time; most have lifetime warranties.
  2. do you think they are faulty ? i dont have any other problems with them...

    how do i run memtest tho ?
  3. Memtest is a free download; one of my boards came with it in the bios settings. Just remove one of sticks and run it for a few minutes; usually, you'll get errors right away if the ram is bad. Use the default ram setting on the motherboard. I just set mine to auto.
  4. theyre both fine...

    whats next ? why cant iset my ram from 1333 to 1600 ? :/
  5. so um. nothing ?
  6. "Bad voltage?" Dumb question but did you make sure the voltage of the ram is set to whatever it is suppose to be?

    example: Ram is suppose to be at 1.65 but you got it at 1.5.
  7. yeah even if i do it manually, i can set my ram to 1600mhz and voltage to 1.5 and it still says bad voltage and clocks it back down to 1333
  8. anyone ?
  9. In order to acheive the 'Rated' DDR3-1600 speed you need to fully set the DRAM Frequency, CAS Timings (CAS-TRCD-TRP-TRAS) and Command Rate (1N/2N), and the DRAM Voltage all per Rated spec.

    I can see you have: FX-8120 and GA-990FXA-UD3, but I don't know which set of Corsair Vengeance 2x4GB DDR3-1600.

    Example (change CAS Timings per spec) - 2x4GB DDR3-1600 9-9-9-24-2N @ 1.50v; some kits are 8-8-8-24-2N, 8-9-8-24-2N, or 7-8-8-24-2N. So look your kit up or look at CPU-z (SPD) and the XMP-1600 listed profile information and substitute the correct values below:

    DIMM Installation:
    CPU: | blank | 4GB | blank | 4GB | ; I prefer this arrangement
    CPU: | 4GB | blank | 4GB | blank |

    F7 ; Loads Optimized Defaults
    Set Memory Clock -> 8 ; 8*200MHz(FSB) = 1600MHz
    DRAM Configuration /Enter
    DDR3 Timing Items -> Manual
    1T/2T Command Timing -> 2T ; 2N = 2T = 2
    CAS# latency -> 9 ; per your kit
    RAS to CAS R/W Delay -> 9 ; per your kit
    Row Precharge Time -> 9 ; per your kit
    Minimum RAS Active Time -> 24; per your kit
    DRAM Voltage Control -> 1.50v~1.55v ; use 1.55v if you have any issues or Memtest fails
    F10 ; Save & Exit = Yes

    Next, test the RAM with Memtest86+ (ISO/Zip) to create a bootable CD/DVD and test for at least 4 Passes. Link -
  10. i have corsair vengeance and kit is cmz8gx3m2a1600c9

    so what settings should i put with these to acheve 1600mhz ?
  11. Follow the directions I posted above, and the CMZ8GX3M2A1600C9 is DDR3-1600 9-9-9-24-2N @ 1.50v kit i.e. exactly as I posted so no need for changes.

    Start with making certain the RAM is installed in the proper DIMM slots (see DIMM Installation: ) and then modify the BIOS settings exactly as posted above (see BIOS: ).

    Good luck and let me know... :)
  12. you sure its 2n and not 2t ?
  13. They're ALL the same as I said (2N = 2T = 2), it means the exact same.

    Just enter what I posted and don't reinvent or deviate.
  14. ok i did exactly as you said, but its still 1333mhz (it did post without voltage warning tho)...

    and whjen i look at everest, it says:
  15. You're looking at the wrong info; instead of 'SPD' look at 'Memory'; the screen is the encoded and available Frequency/CAS/Voltage. Use CPU-z and look at the 'Memory' tab as shown below, that's what is actually running. DRAM Frequency = 800MHz * 2 = 1600MHz (DDR3 = Double Data Rate revision 3).

    Here's an example of 32GB in Quad Cahnnel running DDR3-1600 CAS 9-9-9-24-2N:


    nb! they are at 1.55V tho, should i start lowering them and see what voltage is the best ?
  17. IF you had prior startup failures @ 1.50 then IMO leave it. Until you run 4-passes of Memtest you don't even know if it's stable or not. RAM has a tolerance of ±0.2v~±0.30v and the MOBO between load and idle can bounce the DRAM Voltage ±0.1v all on it's own.
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