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Q6600 & 790i Ultra suddenly does not like 9x multiplier

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chememan
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Monday, December 21, 2009 2:15 PM (permalink)
I built my son a system with a Q6600 and 790i Ultra, 8800GT and some 2000 OCZ ram.  I was able to get the system to 2.8ghz at 9x multiplier and stock volts.  It was LinX and Prime stable and all seemed well.  He was playing a video game for about 3 hours when the maching hard-locked.  No cursor movement, totally frozen. The machine was not stressed and the CPU cores were in the 40's. Since he wanted to finish the game, I attempted to turn the machine back to 2.7ghz so that he could finish his game ... no POST.  It would not post with anything above 2.5ghz at the same voltage and settings that had been 2.8 stable.
The following morning I decided to check the individual systems to see where the problem might be.  I turned the multiplier down to 6, FSB up to 425 (1700) with the ram liked and synced and the system booted and was stable.  I continued to play with it and could do anything that I wanted except post above 2.5 with the multiplier at 9.  I CAN boot and be prime stable at 350x8 for 2.8ghz but cannot make the 9x multiplier work above 2.5ghz.  Since I don't have the cooling to run this machine over 3.0 safely, it will probably perform better at a lower multiplier but am just puzzled by the 9x multiplier issue.
You guys have any ideas what could have happened to the CPU?

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#1

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    ShockTheMonky
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    Re:Q6600 & 790i Ultra suddenly does not like 9x multiplier Monday, December 21, 2009 2:23 PM (permalink)
    What bios version is on the board?

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    #2
    owcraftsman
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    Re:Q6600 & 790i Ultra suddenly does not like 9x multiplier Monday, December 21, 2009 2:33 PM (permalink)
    include your voltage settings and OS in use when you respond to trs32505

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    chememan
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    Re:Q6600 & 790i Ultra suddenly does not like 9x multiplier Monday, December 21, 2009 11:11 PM (permalink)
    790i  ULTRA 
    Q6600 G0
    OCZ 2000 OCZ3N2000SR1G
     GTX250 
    OCZ750 POWER SUPPLY
    Win XP Pro 32
    no NTUNE or any other OC software ever
     
    BIOS Version: P08
    **System **
    CPU Freq, MHz: 2.70GHZ
    FSB Reference Clock, MHz: 1350
    CPU Multiplier: [8X]
    PCle x16-1 & 16-2, MHz: AUTO  [100]
    PCle x16-3, MHz:        AUTO  [100]
    SPPc->MCP Ref Clock, MHz: AUTO [200]
    nForce SPP --> nForce MCP:   [5X]
    nForce SPP c-- nForce MCP:   [5X]
    **Spread Spectrum**
    CPU Spread Spectrum: [Disabled]
    HT Spread Spectrum: [Disabled]
    PCle Spread Spectrurn(SPP): [Disabled]
    PCle Spread Spectrurn(MCP): [Disabled]
    SATA Spread Spectrum: [Disabled]
    **FSB & Memorv Config**
    EPP 2.0 MEMORY [DISABLED]     (?????????? Mem claims it is EPP 2.0)
    FSB - Memory Clock Mode: [LINKED]
    FSB - Memory Ratio:   [SYNC]
    FSB (QDR), MHz: [1350]
    Actual FSB (QDR), MHz:1350
    x MEM (DDR),  MHz: 1350   * (HAS BEEN AS HIGH AS 1700 FOR FSB STABILITY TESTING)
    Actual MEM (DDR), MHz: 1350
    P1: [AUTO]
    P2: [AUTO]
    **Memory Timing Setting**
    Memory Timing Setting: [EXPERT]
    tCL (CAS Latency): 9
    tRCD: 9
    tRP: 9
    tRAS: 28
    Command Per Clock: [2T]
    ** Advanced Memory Settings **
    tRRD: [Auto] 11
    tRC: [Auto] 35
    tWR: [Auto] 12
    tWTR: [Auto] 23
    tFAW: [Auto] 22
    tREF: [Auto] 7.7US
    tRFC: [AUTO] 61
    **System Voltages**
    CPU Core: [1.33125] HAS BEEN AS HIGH AS 1.35 BUT WAS STABLE AT 1.2875 BEFORE CRASH
    CPU FSB: [1.250]   WAS STABLE AT 1.2 BEFORE CRASH
    Memory: [1.800]
    nForce SPP:  1.40 
    nForce MCP:  1.500
    GTLVREF Lane 0: [Auto] 0 
    GTLVREF Lane 1: [Auto] 0
    GTLVREF Lane 2: [Auto] 0
    GTLVREF Lane 3: [Auto] 0
    **CPU Configuration**
    Limit CPUlD Maxval: Disabled
    Intel Speedstep: Disabled
    xPPM Mode: [Native]
    CPU Thermal Control: [Disabled]
    C1E Enhanced Halt State: [Disabled]
    Execute Disable Bit: [DISABLED]
    Virtualization Technology: [Disabled]
    CPU Core 0: [Enabled]
    CPU Core 1: [Enabled]
    CPU Core 2: [Enabled]
    CPU Core 3: [Enabled]
    These settings are also 20+ LinX stable but have frozen once or twice in the past 2 days 
      
    When we first built this computer, it was overclocked somewhat and was fine.  A few weeks later it started to experience the dreaded video corruption bug and we struggled to solve that.  We updated the BIOS more than once and changed several settings.  Part of the solution was to return to near stock clocks.  All has been well for over a year but I decided to take another shot at clocking this thing. 
     
    If you see anything odd, I will gladly change it and try... 
    post edited by chememan - Monday, December 21, 2009 11:27 PM

    4930K @ 4.6 X79Dark + 4x4 G-Skill 1900-C9 + 780Ti Classified + 840 Pro SSD + AX1200 + HAF 932 
     
    W3540 @ 4.4g  on H2O + EVGA E760 Classified + 3x2GB G-Skill Perfect Storm 2133 + 
    2x EVGA GTX480SC in SLI on H2O  + Intel X25-M 160 G2 + WD Velociraptor 300 + Corsair AX1200 + HAF 932
     
    3570k 4.5 on H2O + Z77FTW + GTX480SC + G.SkILL 1800 + Intel X25M + Corsair HX850 + HAF 932

    3770k 4.6 on H20 + Z77FTW + GTX480SC + G.SkILL 1800 + Intel 520 + CM1000+ HAF 932

    HEATWARE  

    #4
    owcraftsman
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    Re:Q6600 & 790i Ultra suddenly does not like 9x multiplier Wednesday, December 23, 2009 0:00 PM (permalink)
    I know there is a newer Bios but I do not feel it is necessary. By all means I would take trs32505 advice if he chimes back in here but I see nothing terribly wrong with those settings. If it were me I would do a cmos clear w/battery out after which I would then restore power and battery enter setup and set optimized defaults then date and time then save and exit. Boot to bios again to setup your boot drive and sequence as needed and then begin testing memory then proc at stock speeds for complete stability. Minimum 6 hrs memtest and 10 hrs prime blend. Once you have completed this report back and we can consider what steps to Overclocking to take next.

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    #5
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