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Windows unable to boot unless I underclock ram to 1333MHz.

My computer refuses to boot into Windows 7 (Ultimate, 64-bit) unless my RAM is severely underclocked to 1333 MHz. I can overclock everything fine, but I cant "neutral-clock" my ram to what it's designed to be set as.

PC Specs:
CPU: AMD FX-8350 Eight-Core Processor (8 CPUs), ~5.0GHz
RAM: Corsair Vengeance Pro RED 16GB (4x4GB) 1866MHz Dual Channel
MB: ASUS M5A97 R2.0
GPU: GALAXY GeForce GTX 560 Ti Superclocked 1GB GDDR5
PSU: Ultra 750W

I'm not sure if my motherboard is defective, my ram is defective, my hard drive is damaged, or windows is corrupt.
5 answers Last reply Best Answer
More about windows unable boot underclock ram 1333mhz
  1. Have you made sure you have set the timings to what is specified? This is quite important, as incorrect timings can cause failure to boot.
  2. PyjamasCat said:
    Have you made sure you have set the timings to what is specified? This is quite important, as incorrect timings can cause failure to boot.

    So here is my ram: http://www.corsair.com/us/memory-by-product-family/vengeance-pro-series-memory/vengeance-pro-series-8gb-2-x-4gb-ddr3-dram-1866mhz-c9-memory-kit-cmy8gx3m2a1866c9b.html

    The "tested latency" is 9-10-9-27. The SPD latency is 9-9-9-24.
    Previously, the timing was 9-11-9-27. I then switched them to AUTO (for all 4; everything else was already on AUTO). I'll set it to 9-9-9-24 and test it, also 9-10-9-27.

    I let you know if it works out.
  3. What I did:

    Added 4th DIMM; there were only 3 in there set to 1333MHz.
    Set DRAM FREQ. to 1866MHz.
    Adjusted timings from AUTO-AUTO-AUTO-AUTO to 9-9-9-24

    PC running.
  4. ZeroDelta said:
    PyjamasCat said:
    Have you made sure you have set the timings to what is specified? This is quite important, as incorrect timings can cause failure to boot.

    So here is my ram: http://www.corsair.com/us/memory-by-product-family/vengeance-pro-series-memory/vengeance-pro-series-8gb-2-x-4gb-ddr3-dram-1866mhz-c9-memory-kit-cmy8gx3m2a1866c9b.html

    The "tested latency" is 9-10-9-27. The SPD latency is 9-9-9-24.
    Previously, the timing was 9-11-9-27. I then switched them to AUTO (for all 4; everything else was already on AUTO). I'll set it to 9-9-9-24 and test it, also 9-10-9-27.

    I let you know if it works out.


    ZeroDelta said:
    What I did:

    Added 4th DIMM; there were only 3 in there set to 1333MHz.
    Set DRAM FREQ. to 1866MHz.
    Adjusted timings from AUTO-AUTO-AUTO-AUTO to 9-9-9-24

    PC running.


    Great! So you only had 3 in when you tried 1866?
  5. Best answer
    Yeah I had only 3 because the fan of my HSF is slightly sitting over the far left RAM slot. I just shoved the 4th one in there and everything is running smoothly.
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