Random shut downs - Dying CPU? MOBO? PSU?

Asus A8n-sli mainboard
July 8, 2010 at 10:52:38
Specs: Windows 7, corsair 4gb pc3200
Help me narrow down if its CPU? MOBO? or
something else.... I have a computer which I
have had for 4 years now... and it's always had
this issue of it randomly shutting off. 70% of
the time it happens when I am playing high
graphics games, but 30% of the time it
happens while the computer is idle.

As any pro would first guess, it might be a due
to your PSU, then someone will say, oh its
probably your RAM, try refitting or replacing.
And them someone will say, oh its probably a
bad Motherboard, then one will say its a bad
GFX card.

So like all of what any new person might think,
I have replaced a few parts since I Had an
Identical System with similar specs just sitting
there, being used as a regular home computer.
But mine is more a Gaming computer.

My System specs:

Operating System
MS Windows 7 Ultimate 64-bit

AMD Athlon 64 FX-60 40 °C
Toledo 90nm Technology
Core 0
Core Speed 2860.4 MHz
Multiplier x 13.0
Bus Speed 220.0 MHz
Rated Bus Speed 1100.2 MHz
Temperature 41 °C
Thread 1

Core 1
Core Speed 2860.4 MHz
Multiplier x 13.0
Bus Speed 220.0 MHz
Rated Bus Speed 1100.2 MHz
Temperature 41 °C
4.0GB Dual-Channel DDR @ 110MHz 2.5-3-3-
Type DDR
Size 1024 MBytes x 4
Manufacturer Corsair
Max Bandwidth PC3200 (200 MHz)
Part Number CMX1024-3200C2

Frequency 200.0 MHz
CAS# Latency 3.0
RAS# To CAS# 3
RAS# Precharge 3
tRAS 8
Voltage 2.500 V

ASUSTeK Computer INC. A8N-SLI (Socket

DELL 1800FP @ 1280x1024
512MB GeForce 7900 GTX (BFG Tech) 48

Hard Drives
156.29GB Seagate ST3160811AS ATA Device
(Unknown Interface) 36 °C
390.71GB Seagate ST3400633AS ATA Device
(Unknown Interface) 38 °C

Optical Drives
NEC DVD_RW ND-3550A ATA Device

500W Ultra (2x 18A 12v rail)- Running to
Motherboard ONLY!!
500W Cooler Master (2x 18A 12v rail) -
Running 4 Hard Drives, 2 CPU Fans, 1 Optical
Drive, and 1 7800GTX GFX Card.

As you can tell, there is enough power to the
Computer - my KillWatt meter says im only
drawing 220Watts out of the power socket.

As far as the replaced parts go.

I have replaced the:
Memory from CMX1024-3500LLPRO to

Video Card from 9400GT to 7900GTX OC

Went from 1 PSU to 2 PSU setup

Went from XP to Windows 7 (Same issues
With XP Pro, Vista Ultimate, and Windows 7

Also replaced old Motherboard from ASUS
BIOS updated from ASUS site from 1014 for
A8n-SLI to Beta 1614

So guys, Any other suggestions? I have also
overclocked and underclocked a bit on this
CPU - Its native is 2.6ghz, I brought it down to
2.0Ghz, and now its at 2.8Ghz. CPU Voltage
is still 1.55v.

Voltage Readings below
Sensor Properties:
Sensor Type ITE IT8712F v7+ (ISA 290h)
GPU Sensor Type Analog Devices ADT7473
(NV-I2C 2Eh)
Motherboard Name Asus A8N-E / A8N-SLI
Chassis Intrusion Detected No

Motherboard 39 °C (102 °F)
CPU 43 °C (109 °F)
CPU #1 / Core #1 47 °C (117 °F)
CPU #1 / Core #2 44 °C (111 °F)
GPU 41 °C (106 °F)
GPU Diode 48 °C (118 °F)
GPU Memory 41 °C (106 °F)
GPU Ambient 40 °C (104 °F)
Seagate ST3160811AS 41 °C (106 °F)
Seagate ST3400633AS 43 °C (109 °F)

Cooling Fans:
CPU 2083 RPM
Chipset 6490 RPM
GPU 1187 RPM (50%)

Voltage Values:
CPU Core 1.55 V
+3.3 V 3.34 V
+5 V 5.11 V
+12 V 12.03 V
+5 V Standby 4.95 V
VBAT Battery 3.10 V
GPU Vcc 3.31 V
Debug Info F 0051 00FF 001A 0000 0000
Debug Info T 43 39 36
Debug Info V 61 00 D1 BE BC BF 00 (F7)

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July 8, 2010 at 11:24:57
My guess is the CPU fan is failing or your Thermal Greece on the Heat sink has dried up.

Run Speedfan on you computer and monitor your CPU temps. If they go over 60 C then there is your problem...


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July 8, 2010 at 23:54:18
seems to me you have done your home work quite well.
your cpu at 41 degrees shouldnt be an issue, same for your power supplies.
cant see any issues with the graphics card, temps look good, overall cooling appears to be great.
which would lead me to think about memory yes i know you replaced the memory, but it could be over heating, pc 3200 is a bit old hat..
this is indeed a hard one to pin point, you have changed everything on the system mobo, mem, graphics, added power a 2nd power supply, try using just the newer power supply, maybe the older one still has a problem?

i hate computers!
but cant help myself....

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