FSB/DRAM ratio

I can't get my computer to boot with a 1:2 ratio. I'm actually under-clocking everything just to try and enable it.. My FSB is at 300, it runs with the next ratio at that (not increasing it with the ratio), is this normal? Have I just hit a wall? Does a voltage need to be higher?


Case: Antec 12000 V3
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129100
CPU cooler: Corsair Hydro H7
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181013&Tpk=H70
Motherboard: MSI 890FXA-GD70
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130274
GPU: Nvidia 9800 GTX
http://www.evga.com/articles/399.asp
CPU: AMD Phenom II X4 970 Black Edition Deneb 3.5GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103894
Memory: Corsair Dominator GT (4 x 2 gig)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145317
CD Burner: MSI 24X DVD+R
http://www.newegg.com/Product/Product.aspx?Item=N82E16827100058
Hard Drive: Western Digital Caviar 500 gig, 6gb/s, 7200 rpm
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136769
PSU: Antec CP-1000 1000W Continuous
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371036
Tuner: Hauppauge WinTV-HVR-2250 Media Center Kit Dual
http://www.newegg.com/Product/Product.aspx?Item=N82E16815116036
10 answers Last reply
More about dram ratio
  1. Of course your system normal, you cannot boot because your ram not enough strong run at high frequency, overclock must step by step. You must start at default, and raise your fsb step by step, increase fsb freq ram will up.
  2. henydiah said:
    Of course your system normal, you cannot boot because your ram not enough strong run at high frequency, overclock must step by step. You must start at default, and raise your fsb step by step, increase fsb freq ram will up.

    Huh? Like I said, I'm DECREASING the frequency of everything and underclocking it, and using loose timings, only thing being increased is the ratio. I'm adjusting all the multipliers to be lower frequency than they were running at.. and I clearly stated I did NOT increase the FSB..... just the ratio. Also by changing it from a ratio of 1:2.66 to 1:2 and not changing FSB it decreases the frequency of the RAM.. so really no clue what you are talking about whatsoever.

    Please read the question before responding.
  3. - first check your ram with memtest86+: http://www.memtest.org/
    if your ram clear youmust
    - Clear Cmos (unplug PSU from electric, find jumper Clear Cmos , wait, put it again, boot) if you don't know clear Cmos read guide your book mobo.
  4. henydiah said:
    - first check your ram with memtest86+: http://www.memtest.org/
    if your ram clear youmust
    - Clear Cmos (unplug PSU from electric, find jumper Clear Cmos , wait, put it again, boot) if you don't know clear Cmos read guide your book mobo.

    Its kind of impossible to run anything on a computer that won't boot, and I know how to reset my bios, I'm trying to enable that ratio, not fix my bios after it fails.
  5. if you've done the Clear Cmos, double check the connection, if your computer can not boot due to overclocking, then check all the hardware out with another pc to see if something is broken or not. Did you notice the indicator lights on the motherboard to live or die on it to read instructions on the motherboard book.
    reset bios different with clear CMOS !
  6. OK, let's backup. Does your system boot at stock settings?
  7. First
    My DDR3 is 1600: 200 (Bus) x 2 (Mult) x 2 (DDR) x 2 Dual Channel) = 1600
    Your DDR3 2000: 300 x 2 x 2 x 2 = 2400 not 2000
    try mem mult of 5:3 (1.667)
    But in case I'm off in left field.
    Have you tried runing just one pair ( 2 x 2). If not start with just one pair, get it to work then add 2nd pair.
  8. @henydiah TY for trying to help, but you clearly don't understand the issue I'm talking about. I can boot fine at higher ratios, the hardware is fine as far as I can tell, I'm just trying to adjust the FSB/DRAM ratio.

    @jsc, My system boots at stock settings for other ratios as well as a 3:8 ratio with everything very overclocked.

    @ RetiredChief, I'm not sure what you mean by the x 2 x 2 x 2. I just set all the multipliers very low when I try to use that ratio, and nothing that the bios is showing is being increased above their stock specs. I haven't tried just one pair though, so I'll try that later.

    Also there is no 5:3 ratio showing, it shows it as the reduced with decimals, but 1:2 is the closest it gets (no 1:1) and the next is 1:2.66 (3:8). Realistically it's running great as is, I'm just hoping to get the FSB higher with system specs otherwise the same once I figure out how to get it to boot at that ratio.
  9. the 2 x 2 x 2 is how they come up with the rating based on memory freq.
    memory freq is Bus speed time multiplier/divider. First 2 is vaiable as it is the Freq multiplier applied in input Freq (Bus).
    this is then multiplied by 4 (2 x 2) which is based on how much faster it is than SDR Ram. First 2 is DDR, Works on both leading and lagging edge of Clock pulse (SDR on on Leading edge. The 2nd 2 is that it is in daul changle mode vs single channel mode.
  10. At the 667 ratio ....

    300MHz x 6(.)67 = DDR3 2000


    [:jaydeejohn:5]


    Not sure, however, that you can boot 4 sticks --- might need an AM3+ motherboard for that (I would think that 2 sticks would boot if MSI supports those RAMs)
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