Troubleshooting a possible bad CPU/MoBo

I recently got a custom PC to do high CPU load work, (100% proper multi-thread work software on the order of hours and days). The system has an intel Q6600, on an asus p5n-t deluxe board, with an Arctic Cooling Freezer 7 Pro CPU Fan, running at stock speed.

I passed Prime95 at 24+ hours
I passed memtest86+ after multiple cycles
I failed OCCT at 2 hours, re-ran and failed at 4 hours
The temps at the time of freeze in OCCT show 55 degC or less

When I try running my work software, if I run on a single core, I'm stable for 24+ hours. When I run on two or more cores, everything freezes (mouse stops, clock stops, etc) in about an hour. I originally thought it was due to the load balancing in my work software (tinkering with that can extend the time until it freezes), but the work software gives the same results as OCCT.

Does anyone have any insights as to whether this may be caused by a bad motherboard, or bad CPU? Are there other tests to try, or a way to restrict OCCT to specific cores to systematically test each core?

5 answers Last reply
More about troubleshooting mobo
  1. It's a long shot, but you should run a scan of your hard disk, with HD Tune or a similar program. Other than that, I'm really at a loss.
  2. what is your cpu voltage currently at? Try bumping it up by 1 step
  3. CPU voltages are set to auto, would it be worth overriding the mb auto-setting to manually increase this?
  4. With out all your spes it could be anything.
  5. Here's some of the info from CPUZ.

    I'm currently running my test software on Cores 0 and 1 as two separate instances, instead of two separate threads to see if I recreate a crash. Which is why those two cores have higher temps than the other 2 cores.

    I appreciate people's time and insights about this!

    Also, I'm running my RAM at 800mhz, instead of 1033, because that's what the board autodetected. I'll go through and adjust that later, but until I know if I'm going to RMA the cpu and/or board, I've not bothered.

    =========CPUZ Info below=========

    Processors Information

    Processor 1 (ID = 0)
    Number of cores 4 (max 4)
    Number of threads 4 (max 4)
    Name Intel Core 2 Quad Q6600
    Codename Kentsfield
    Specification Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
    Package Socket 775 LGA (platform ID = 4h)
    CPUID 6.F.B
    Extended CPUID 6.F
    Core Stepping G0
    Technology 65 nm
    Core Speed 2401.1 MHz (9.0 x 266.8 MHz)
    Rated Bus speed 1067.2 MHz
    Stock frequency 2400 MHz
    Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, EM64T
    L1 Data cache 4 x 32 KBytes, 8-way set associative, 64-byte line size
    L1 Instruction cache 4 x 32 KBytes, 8-way set associative, 64-byte line size
    L2 cache 2 x 4096 KBytes, 16-way set associative, 64-byte line size
    FID/VID Control yes
    FID range 6.0x - 9.0x
    max VID 1.325 V
    Features XD, VT


    Northbridge NVIDIA nForce 780i SLI SPP rev. A2
    Southbridge NVIDIA nForce 780i SLI MCP rev. A3
    Graphic Interface PCI-Express
    PCI-E Link Width x16
    PCI-E Max Link Width x16
    Memory Type DDR2
    Memory Size 2048 MBytes
    Channels Dual
    Memory Frequency 400.2 MHz (2:3)
    CAS# 5.0
    RAS# to CAS# 5
    RAS# Precharge 5
    Cycle Time (tRAS) 18
    Bank Cycle Time (tRC) 23
    Command Rate 2T

    Hardware monitor

    ITE IT87 hardware monitor

    Voltage sensor 0 1.22 Volts [0x4C] (CPU VCORE)
    Voltage sensor 1 3.25 Volts [0xCB] (VIN1)
    Voltage sensor 3 4.87 Volts [0xB5] (+5V)
    Voltage sensor 4 12.16 Volts [0xBE] (+12V)
    Voltage sensor 7 4.92 Volts [0xB7] (+5V VCCH)
    Voltage sensor 8 3.09 Volts [0xC1] (VBAT)
    Temperature sensor 0 32°C (89°F) [0x20] (TMPIN0)
    Temperature sensor 1 37°C (98°F) [0x25] (TMPIN1)
    Fan sensor 0 2848 RPM [0xED] (FANIN0)
    Fan sensor 1 3924 RPM [0xAC] (FANIN1)

    Hardware monitor

    Intel Core 2 Quad Q6600 hardware monitor

    Temperature sensor 0 48°C (118°F) [0x34] (Core #0)
    Temperature sensor 3 44°C (111°F) [0x38] (Core #3)
    Temperature sensor 1 43°C (109°F) [0x39] (Core #1)
    Temperature sensor 2 38°C (100°F) [0x3E] (Core #2)

    Hardware monitor

    GeForce 9500 GT hardware monitor

    Temperature sensor 0 43°C (109°F) [0x2B] (GPU Core)
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