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Thread: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks




  1. #1
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    Default P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Intel i5-750
    Gigabyte P55M-UD2, latest BIOS
    Coolermaster Hyper 212+ CPU heatsink
    MSI GTS 250 1GB
    OCZ 500W ModxStream PSU
    4GB of G.Skill F3-12800CL9D-4GBNQ (2x2GB DIMMs) - rated DDR3 1600 1.5v 9-9-9-24

    Just recently assembled this system for a friend and have been unable to get it stable yet, even at stock clock speed & auto voltages (RAM voltage/timings manually set) I've yet to OC my other p55/i5 system, and had no difficulties setting it up, so don't really know what I'm doing when it comes to tinkering on the P55 platform. I'm not after much, stable @ stock would be fine, at most an OC of 3.2-3.4ghz would be nice.

    The system seems to freeze solid (hard reboot required) randomly while idle, often after under a minute idle/without load. I've tried a bunch of different settings that I've seen recommended, and the system has tested +2 hrs linpack or 3hrs prime95 largeFFT stable with a few different configs, yet each has either locked up soon after the load ended, or BSOD'ed when running Sandra CPU benchmarks right after hrs of prime95 load, frozen shortly after boot while at idle, etc....

    Obviously I've missed something, but I've yet to find anyone with a similar config and only 4GB of this RAM (DDR3 1600 1.5v 9-9-9-24 rated), so I've been hesitant to try the solutions offered for ppl running 8GB or RAM rated @ 1.65v

    Will post followups with changes to my settings as I try stumble through finding a solution

    Current settings:
    CPU Clock Ratio 20x

    Advanced Core Features [Press Enter]:

    Intel(R) Turbo Boost Tech................[Enabled]
    CPU Cores Enabled........................[All]
    CPU Enhanced Halt (C1E)..................[Enabled]
    C3/C6/C7 State Support...................[Enabled]
    CPU Thermal Monitor......................[Enabled]
    CPU EIST Function........................[Enabled]
    Bi-Directional PROCHOT...................[Auto]

    QPI Clock Ratio..........................[Auto]
    QPI Link Speed........................[4.8Ghz]
    Uncore Clock Ratio....................[16x]
    Uncore Frequency.........................2133MHz

    >>>>> Standard Clock Control <<<<<

    Base Clock (BCLK) Control................[Disabled]
    BCLK Frequency ..........................[133]
    Extreme Memory Profile (X.M.P.)..........[Disabled]
    System Memory Multiplier (SPD)...........[Auto]
    Memory Frequency (MHz)................1333
    PCI Express Frequency (MHz)..............[Auto]
    C.I.A.2..................................[Disabled]

    >>>>> Advanced Clock Control <<<<<

    CPU Clock Drive..........................[ 800mV]
    PCI Express Clock Drive..................[ 900mV]
    CPU Clock Skew...........................[ 0ps]

    Advanced Memory Settings:

    Extreme Memory Profile (X.M.P.)..........[Disabled]
    System Memory Multiplier (SPD)...........[Auto]
    Memory Frequency (MHz)................1333
    Performance Enhance (SPD)............. [Turbo]
    DRAM Timing Selectable (SPD)............ [Expert]
    Profile DDR Voltage ..................1.5
    Profile QPI Voltage ..................1.1
    Channel Interleaving.....................[Auto]
    Rank Interleaving........................[Auto]

    >>>>> Channel A & B

    Channel A Timing Settings [Press Enter]:
    Cas Latency Time........................[9]
    tRCD....................................[9]
    tRP.....................................[9]
    tRAS...................................[24]

    >>>>> Advanced Timing Control

    tRC....................................[Auto]
    tRRD...................................[Auto]
    tWTR...................................[Auto]
    tWR....................................[Auto]
    tWTP...................................[Auto]
    tWL....................................[Auto]
    tRFC...................................[Auto]
    tRTP...................................[Auto]
    tFAW...................................[Auto]
    Command Rate (CMD).................. 1 [1]

    >>>>> Misc Timing Control

    B2B Cas Delay..........................[Auto]
    Round Trip Latency.....................[Auto]

    Advanced Voltage Settings:

    ******Mother Board Voltage Control ******
    Voltage Types............Normal......Current
    --------------------------------------------

    >>> CPU
    Load Line Calibration...................[Enabled]
    CPU Vcore..................1.18750v..[Auto]
    QPI/VTT Voltage..........1.100v.....[Auto]

    >>> MCH/ICH
    PCH Core....................1.050v.....[Auto]
    CPU PLL......................1.800v.....[Auto]

    >>> DRAM
    DRAM Voltage..............1.500v.....[Normal]
    DRAM Termination.........0.750v.....[Auto]
    Ch-A Data VRef............0.750v.....[Auto]
    Ch-A Data VRef............0.750v.....[Auto]
    Ch-B Data VRef............0.750v.....[Auto]
    Ch-B Data VRef............0.750v.....[Auto]

    Miscellaneous Settings:[/SIZE]

    Isochronous Support....................[Enabled]
    Virtualisation technology..............[Enabled]
    Last edited by Logicaluser; 06-03-2010 at 01:52 PM.

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Have you set your own QPI/Vtt, this is key. Try 1.2-1.25 and see how things go

    Have you tested this memory on your other board at all, or one stick at a time to be sure it is not faulty?

  3. #3
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Quote Originally Posted by Lsdmeasap View Post
    Have you set your own QPI/Vtt, this is key. Try 1.2-1.25 and see how things go

    Have you tested this memory on your other board at all, or one stick at a time to be sure it is not faulty?
    I have yet to manually adjust QPI/Vtt. Changed to 1.21v QPI, will test now and see how it goes.

    Also have not tested the sticks individually or in the other board, can try that tomorrow morning and see what happens.

    Edit: Locked up within 5min at 1.21v QPI/Vtt, all other settings as per template above, trying 1.25v
    Edit: Also locked up at 1.25v QPI/Vtt, same circumstances
    Last edited by Logicaluser; 06-03-2010 at 02:17 PM.

  4. #4
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Hmm try that with ram voltage manually set at 1.5-1.54

    Also try performance enhance standard, and extreme (Sometimes extreme is better than the others, not sure why)

    What is is locking up in, try memtest86+ so we are only mainly testing memory here
    Memtest86+ - Advanced Memory Diagnostic Tool

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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    The machine has been locking up while at idle/ with no load, with either CPU-Z+HardwareMonitor+the Sandra window open (but nothing running) or just when left at desktop with no apps open. I can grab memtest86+ if it'll help

    Oh, I'm running Windows 7 x64 if it matters

    RAM voltage is set to "Normal" (1.5v) currently, will try 1.54v now and see what happens, and then I'll see if the performance enhance setting has any effect

  6. #6
    Lsdmeasap's Avatar
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Ahh ok, I just wondered since you didn't mention what was going on when things crashed.

    Ya, get the latest Memtest86+ above and test 5-10 full passes or overnight while you sleep

  7. #7
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    I'm unsure why/how, but it seems to be freezing even sooner after bootup the last 10-15 or so bootups, before I can even launch apps, with a variety of seetings, even when reverted to the template above Beforehand I had at least a minute and could actually open apps, start a benchmark, etc... sometimes

    I tried 1.56v for the RAM (no 1.54 in bios), and 1.5v with 'standard' on the performance enhance, no effect.

    Memtest is running now.

  8. #8
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Memtest86+ has been running for the past 11hrs or so, 16 passes, no errors.

  9. #9
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    I have tested the machine with the 4GB kit of F3-12800CL7D-4GBRM (rated @ 1600mhz 7-8-7-24 @ 1.6v) out of my other stable i5-750/p55-UD3R build and it still freezes when idling, a few minutes/seconds after load stops, etc... same symptoms

    Used the same settings as the template above, RAM @ 1333mhz 9-9-9-24 @ 1.5v

    I'm puzzled as to what I should try next...
    Different PSU perhaps? Different video card?

  10. #10
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    I've now swapped the PSU with another 500w OCZ ModxStream PSU that's been running stable a year or so, and the machine still freezes at idle/light CPU load, most often soon after heavy load stops
    (I.E. prime95/Linpack/etc... running for awhile, and the machine locks up within a minute or two of me clicking stop)

    I tried disabling LLC, no difference


    Next I'll swap in a different graphics card...
    Last edited by Logicaluser; 06-04-2010 at 11:17 AM.

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