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G.Skill Ripjaws 2x8GB 1866 RAM limited to 1600 on M5A99X Evo R2.0?

I'm running an AMD FX 8350 on a M5A99X Evo R2.0, with 2x8GB G.Skill RIpjaws 1866 RAM. When Overclocking the ram to 1866, the PC will not boot, period. At 1600 and 1333, the system operates fine. I suppose the MOBO has a failsafe that after a failed boot or two, it removes the overclocking selections in the AI Tweaker? I'm very new to overclocking, and I've only recently messed around with it. I didn't know that I would have to overclock the RAM myself, even.

Is there a particular compatibility issue I'm not seeing?
14 answers Last reply Best Answer
More about skill ripjaws 2x8gb 1866 ram limited 1600 m5a99x evo
  1. Maybe your ram won't run at those speeds on that motherboard. The motherboard specs do say that it can run at 1866 MHz memory speeds. It will take some testing to find out what settings you need in the motherboard to get 1866 MHz stable.
  2. Here is a brilliant thread regarding general overclocking settings for many FX CPUs:

    http://www.overclock.net/t/1348623/amd-bulldozer-and-piledriver-overclocking-guide-asus-motherboard

    It might help you out.
  3. ahnilated said:
    Maybe your ram won't run at those speeds on that motherboard. The motherboard specs do say that it can run at 1866 MHz memory speeds. It will take some testing to find out what settings you need in the motherboard to get 1866 MHz stable.


    I use the exact same RAM on the exact same motherboard, except it runs a 2133MHz. The speed shouldn't be an issue.
  4. Best answer
    Your 8350 prob has a slightly weaker MC (memory controller) than the norm, try setting the sticks to spec timings manually, thenn set the DRAM voltage up + 0.05 from spec (i.e. if the sticks are 1.5 set DRAM voltage to 1.55) and raise the CPU/NB voltage to 1.22
  5. In addition to the basic memory settings, boost CPU-NB Voltage +0.1V and that will help the CPU stabilize DDR3-1866. Let us know how it goes.

    Thank you
    GSKILL SUPPORT
  6. gskill support said:
    In addition to the basic memory settings, boost CPU-NB Voltage +0.1V and that will help the CPU stabilize DDR3-1866. Let us know how it goes.

    Thank you
    GSKILL SUPPORT


    Awesome to see some actual representatives coming out to the forums. That sends a pretty good message.
  7. gskill support said:
    In addition to the basic memory settings, boost CPU-NB Voltage +0.1V and that will help the CPU stabilize DDR3-1866. Let us know how it goes.

    Thank you
    GSKILL SUPPORT


    I did as you said, and it still failed to load.
  8. What are DRAM and CPU/NB voltages currently at? Have seen some have to take the CPU/NB up to 1.4
  9. Tradesman1 said:
    What are DRAM and CPU/NB voltages currently at? Have seen some have to take the CPU/NB up to 1.4



    Here's the default settings for what I've currently got set, which is ram at 1600, and CPU at 4.4Ghz, using the auto clock options.
  10. What are the voltages at? Default doesn't tell me anything, your mobo may have the CPU/NB at 1.11 andother mobo may be at 1.18 depending on what all is with the rig
  11. Tradesman1 said:
    What are the voltages at? Default doesn't tell me anything, your mobo may have the CPU/NB at 1.11 andother mobo may be at 1.18 depending on what all is with the rig


    Apparently the picture I posted didn't go through.

    http://s1128.photobucket.com/user/RajjWoW/media/140228205110.png.html?sort=3&o=0
  12. Try DRAM voltage at 1.55 and NB voltage at 1.22
  13. Tradesman1 said:
    Try DRAM voltage at 1.55 and NB voltage at 1.22


    No cigar. Still failed to boot.
  14. May want to bench it, have a guide that might help here:

    http://www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html
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