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2400MHZ ram operating at 1600MHZ. Computer won't boot when set to 2400.

I have:

16GB of Kingston DDR3.
AMD FX-8350
Asus Sabertooth 990FX R2.0

My ram is advertised as 2400MHZ speed. PC reads it at 1600MHZ.

I can go into my bios and set the ram to 2400MHZ in the memory tuning section, but the PC won't post or boot after I do that. I have to manually reset the bios on the back of my PC to be able to get back in. Is there another setting I am missing?
9 answers Last reply Best Answer
More about 2400mhz ram operating 1600mhz computer boot set 2400
  1. I dont think your board can run at them speeds, 1866 is the fastest i think.
  2. 16GB of any Kingston RAM at 2400 is not on their compat list.

    http://dlcdnet.asus.com/pub/ASUS/mb/SocketAM3+/SABERTOOTH_990FX_R2.0/Sabertooth_990FX_R20-Memory-QVL.pdf

    Last Update in 2013: http://dlcdnet.asus.com/pub/ASUS/mb/SocketAM3+/SABERTOOTH_990FX_R2.0/SABERTOOTH-990FX-R20_DRAM_QVL_1101.pdf

    I would first try to mimic some of the timings of others that are, and then loosen up the timings as needed to try to get it working. 1866Mhz is likely the sweet spot though.
  3. The AMD FX memory controller has problems with anything over DDR3 2133 and that's not even a guarantee. 1866 will work with pretty much all of them.
  4. Best answer
    Your motherboard only supports up to 1866MHz. You might be able to get 1900MHz out of it by setting it to 1866MHz and giving a 10MHz base clock overclock to the CPU. I cannot guarantee this method will work but it won't hurt anything to try.
  5. Thanks for the help everyone. I didn't know my motherboard only supported up to 1866MHZ. Looks like it's time to take a trip to microbytes.
  6. To be clear, the memory controller is on the CPU not the motherboard. It will not matter what board you buy, AMD FX can't handle more than DDR3 2133 and that's with a 'good' CPU. Just like with the rest of the CPU ( some overclock better than others ) the memory controllers vary in quality.
  7. anort3 said:
    To be clear, the memory controller is on the CPU not the motherboard. It will not matter what board you buy, AMD FX can't handle more than DDR3 2133 and that's with a 'good' CPU. Just like with the rest of the CPU ( some overclock better than others ) the memory controllers vary in quality.


    This is true and very well said. However, a board not supporting faster memory would result in the system failing to POST when set to faster speeds, wouldn't it?

    As for why I suggested a base clock overclock, I've observed in my old FX machine that increasing the base clock also increases the speed at which the CPU communicates with the RAM or something along those lines. It resulted in my 1600 setting for RAM ending up at about 1640-ish with a 10MHz OC to the base clock.
  8. weberdarren97 said:
    Your motherboard only supports up to 1866MHz. You might be able to get 1900MHz out of it by setting it to 1866MHz and giving a 10MHz base clock overclock to the CPU. I cannot guarantee this method will work but it won't hurt anything to try.


    dont know what you are reading but here is the list for the sabertooth 990fxr2.0 http://dlcdnet.asus.com/pub/ASUS/mb/SocketAM3+/SABERTOOTH_990FX_R2.0/SABERTOOTH-990FX-R20_DRAM_QVL_1101.pdf
  9. I use corsair 2400mhz works great
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