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Thread: Common issue: 4gb OK but 8GB NG

  1. #1
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    • Hokuto's system
      • Motherboard:
      • Asus P5Q Pro Turbo
      • CPU:
      • Intel Q8400
      • Memory:
      • Corsair TWIN2X4096-6400C5 G (8GB)
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    Common issue: 4gb OK but 8GB NG

    PQ5 Pro Turbo, Q8400, Corsair TWIN2X4096-6400C5 G (8gb)

    This is an entirely new build, and I've had good success with 2 sticks running at default values in either slots 1/3 or 2/4, and I loaded Windows 7 (64bit) RC without any problem. 4 sticks is the "sticking point" so to speak. I've compiled advice from people here and other forums, and here's where I am at present:

    Round 1: I tried the following settings:
    DRAM voltage: 2.0V
    NB voltage: 1.2 (up from base 1.10)
    Legacy USB: disabled
    DRAM freq: 667
    Latency: 5-5-5-18

    Results: first time, NG (no beeps, zilch). Upon reset, POST okay, but computer hangs at the "loading express gate" message. I disabled express gate, but now I get nothing (NG) again, next round of settings:

    Round 2:
    DRAM voltage: 2.0V
    NB voltage: 1.22
    DRAM freq: 667
    Latency: 6-6-6-18

    Result: NG

    I continued raising the NB voltage till I got to 1.3V, at which point I got through POST, but Windows shows only an error page. At NB 1.32V, I get the "startup repair" page, then BSOD.

    Next round:
    DRAM voltage: 2.0V
    NB voltage: 1.34
    DRAM freq: 667
    Latency: 5-5-5-18

    With these settings I usually get past POST, but windows gives me a variety of responses, including the startup repair page, windows error recovery, etc. One time Windows actually tried to boot, then retreated again to the BSOD error page. Errors listed variously include things like "Phase 0_initialization failed" and "page fault in non-paged area."
    The BSOD "technical information" lists what appear to be memory addresses like the following:
    ***STOP: 0X0000001E (0XFFFFFFFFC000001D, OXFFFFF88000DD8002, OX0000000000000002, OXFFFFFA8003A8C600)
    ***ataport.sys - address FFFFF88000DD8002 base at FFFFF88000DD4000, Datestamp 49ee8daa

    I was first able to get past POST stably when I raised the NB voltage up to 1.34V, but this is getting into the "yellow zone" according to the motherbook manual. I'm wondering whether I should continue pressing the NB voltage up, or change something else, first? (I actually tried 1.4v for a bit, but I couldn't detect any difference in performance).

    On a more general level, the mobo manual (and BIOS) says that "DRAM frequency lower than 800 MHz may cause system boot failure due to spec violation."
    Since I'm now at 667 MHz, I'm wondering: does this mean I would have better luck buying a 1000 MHz DRAM (like Corsair TWIN2X4096-8500C5DF), then lowering its frequency to 800? Or would it be better to get 4GB modules and load them in just slots 1/3?

    I don't want to just continue raising values until I have some idea of whether what I'm doing is ok or self-destructive.
    Any advice much appreciated.
    TIA

  2. #2
    Banhammer in peace PeterB kalniel's Avatar
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    Re: Common issue: 4gb OK but 8GB NG

    Is your command rate at 2T?

  3. #3
    Registered User
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    • Hokuto's system
      • Motherboard:
      • Asus P5Q Pro Turbo
      • CPU:
      • Intel Q8400
      • Memory:
      • Corsair TWIN2X4096-6400C5 G (8GB)
      • Storage:
      • WD 320GB + several others
      • Graphics card(s):
      • Asus EN9800GT Matrix GeForce HTDP/512MD3 R2
      • PSU:
      • Corsair VX550
      • Case:
      • Antec Three Hundred
      • Operating System:
      • Windows 7 (RC)
      • Monitor(s):
      • Eizo/Nanao S1731

    Re: Common issue: 4gb OK but 8GB NG

    Quote Originally Posted by kalniel View Post
    Is your command rate at 2T?
    The command rate on this mobo BIOS is set automatically (no item for changing it manually in BIOS, SFAIK).
    Unfortunately I've got guests visiting this week so I've had to fold up the computer for a few days (it was spread out over my dining table). I'll try more later. Thanks for the response.

  4. #4
    Banhammer in peace PeterB kalniel's Avatar
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    • kalniel's system
      • Motherboard:
      • Gigabyte Z390 Aorus Ultra
      • CPU:
      • Intel i9 9900k
      • Memory:
      • 32GB DDR4 3200 CL16
      • Storage:
      • 1TB Samsung 970Evo+ NVMe
      • Graphics card(s):
      • nVidia GTX 1060 6GB
      • PSU:
      • Seasonic 600W
      • Case:
      • Cooler Master HAF 912
      • Operating System:
      • Win 10 Pro x64
      • Monitor(s):
      • Dell S2721DGF
      • Internet:
      • rubbish

    Re: Common issue: 4gb OK but 8GB NG

    If auto then it probably would be set to 2T. Next thing to look at when you have time is whether there is some kind of 'memory hole' option in the Bios. Also I would start looking at pushing the latencies much higher just to see if you can get it to boot. Some motherboards just really don't like 4 sticks at once.

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