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Troubleshooting a possible bad CPU/MoBo

  • CPUs
  • Software
Last response: in CPUs
November 15, 2008 1:02:05 PM

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?


More about : troubleshooting bad cpu mobo

November 15, 2008 2:15:17 PM

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.
November 15, 2008 2:22:14 PM

what is your cpu voltage currently at? Try bumping it up by 1 step
Related resources
November 15, 2008 2:31:18 PM

CPU voltages are set to auto, would it be worth overriding the mb auto-setting to manually increase this?
November 15, 2008 2:38:05 PM

With out all your spes it could be anything.
November 15, 2008 2:59:17 PM

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)
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)