Question CPU/Cooling/PSU (?) issue

Jul 1, 2019
Hello everybody,
I'm new here, and I'd like to ask for your help to resolve an issue.
I'll try to give all the necessary information. Sorry for the long post !
Thanks in advance !

Here are my specs (desktop computer) :
Brand : Asus
Model : M32CD4-K
CPU : Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz, 3001 MHz, 4 cores
Bios : American Megatrends Inc. 0604, 11/04/2017
RAM : installée 8,00 Go
OS : Microsoft Windows 10 Family x64


Yesterday, for the first time, my computer wouldn't boot. I got a "speed fan error" during POST.
I managed to get past the warning (only by disabling the message in the BIOS. Later I went back and re-enabled it, 4 times out of 5, it now boots without issue).

I've used HWMonitor to keep and eye on temps and fan speeds this morning. Here is the report (HW Monitors and CPU parts) :

EDIT : I've also uploaded a screencap of HWMonitor : (with Min and Max values)

Hardware Monitors
Hardware monitor Nuvoton NCT6792
Voltage 0 0.95 Volts [0x77] (CPU VCORE) [Min : 0.9444V - Max : 1.096V]
Voltage 1 1.01 Volts [0x7E] (VIN1)
Voltage 2 3.33 Volts [0xD0] (AVCC)
Voltage 3 3.33 Volts [0xD0] (3VCC)
Voltage 4 1.02 Volts [0x80] (VIN4)
Voltage 6 1.28 Volts [0xA0] (VIN6)
Voltage 7 0.15 Volts [0x13] (VIN7)
Voltage 8 0.95 Volts [0x77] (VIN8)
Voltage 9 0.12 Volts [0xF] (VIN9)
Voltage 10 1.02 Volts [0x80] (VIN10)
Voltage 11 1.01 Volts [0x7E] (VIN11)
Voltage 12 1.28 Volts [0xA0] (VIN12)
Voltage 13 0.12 Volts [0xF] (VIN13)
Voltage 14 0.13 Volts [0x10] (VIN14)
Voltage 15 1.66 Volts [0xD0] (VIN15)
Temperature 0 120 degC (248 degF) [0x78] (SYSTIN) (?!)
Temperature 1 6 degC (42 degF) [0xC] (CPUTIN)
Temperature 3 53 degC (127 degF) [0x35] (TMPIN3)
Temperature 5 6 degC (42 degF) [0x6] (TMPIN5)
Temperature 6 120 degC (248 degF) [0x78] (TMPIN6)
Temperature 8 110 degC (230 degF) [0x6E] (TMPIN8)
Fan 0 1333 RPM [0x535] (SYSFANIN)
Fan 1 601 RPM [0x259] (CPUFANIN)

Processors Information

Socket 1 ID = 0
Number of cores 4 (max 4)
Number of threads 4 (max 4)
Name Intel Core i5 7400
Codename Kaby Lake
Specification Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz
Package (platform ID) Socket 1151 LGA (0x1)
Extended CPUID 6.9E
Core Stepping B0
Technology 14 nm
TDP Limit 65.0 Watts
Tjmax 100.0 °C
Core Speed 1695.9 MHz
Multiplier x Bus Speed 17.0 x 99.8 MHz
Base frequency (cores) 99.8 MHz
Base frequency (ext.) 99.8 MHz
Stock frequency 3000 MHz
Max frequency 3500 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX, AVX2, FMA3
Microcode Revision 0x8E
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 4 x 256 KBytes, 4-way set associative, 64-byte line size
L3 cache 6 MBytes, 12-way set associative, 64-byte line size
Max CPUID level 00000016h
Max CPUID ext. level 80000008h
Cache descriptor Level 1, D, 32 KB, 2 thread(s)
Cache descriptor Level 1, I, 32 KB, 2 thread(s)
Cache descriptor Level 2, U, 256 KB, 2 thread(s)
Cache descriptor Level 3, U, 6 MB, 16 thread(s)
FID/VID Control yes

IBRS supported, disabled
IBPB supported
STIBP supported, disabled
IBRS_ALL not supported
Turbo Mode supported, enabled
Max non-turbo ratio 30x
Max turbo ratio 35x
Max efficiency ratio 8x
O/C bins none
Ratio 1 core 35x
Ratio 2 cores 34x
Ratio 3 cores 34x
Ratio 4 cores 33x
IA Voltage Mode PCU adaptive
IA Voltage Offset 0 mV
GT Voltage Mode PCU adaptive
GT Voltage Offset 0 mV
LLC/Ring Voltage Mode PCU adaptive
LLC/Ring Voltage Offset 0 mV
Agent Voltage Mode PCU adaptive
Agent Voltage Offset 0 mV
TDP Level 65.0 W @ 30x

Temperature 0 52 degC (125 degF) (Package)
Temperature 1 51 degC (123 degF) (Core #0)
Temperature 2 54 degC (129 degF) (Core #1)
Temperature 3 48 degC (118 degF) (Core #2)
Temperature 4 53 degC (127 degF) (Core #3)
Voltage 0 +0.00 Volts (IA Offset)
Voltage 1 +0.00 Volts (GT Offset)
Voltage 2 +0.00 Volts (LLC/Ring Offset)
Voltage 3 +0.00 Volts (System Agent Offset)
Voltage 4 0.80 Volts (VID #0)
Voltage 5 0.91 Volts (VID #1)
Voltage 6 0.90 Volts (VID #2)
Voltage 7 0.92 Volts (VID #3)
Power 00 10.63 W (Package)
Power 01 7.91 W (IA Cores)
Power 02 n.a. (GT)
Power 03 2.72 W (Uncore)
Power 04 0.43 W (DRAM)
Clock Speed 0 1695.85 MHz (Core #0)
Clock Speed 1 2992.68 MHz (Core #1)
Clock Speed 2 3092.44 MHz (Core #2)
Clock Speed 3 2992.68 MHz (Core #3)
Core 0 max ratio 35.0 (effective 35.0)
Core 1 max ratio 35.0 (effective 35.0)
Core 2 max ratio 35.0 (effective 35.0)
Core 3 max ratio 35.0 (effective 35.0)
-There seem to be no faulty component on my MB (like.. fried capacitors, etc..)
-The CPU fan is plugged in the right socket (CPU_FAN)
-I tried switching the power cable (who knows.. !)

-My wild guesses would be : Fan is busted ?/PSU suffered damage?

Obviously, I mainly tracked the CPU heat and fans speed.

My main fan speed is ranging from 1347 to 2200 rpm.
But my CPU fan goes to 0RPM to 1700RPM.
When it shows 0RPM, the fan is actually rotating, but very slowly.
Yesterday, the CPU fan wouldn't go past 500RPM, but it doesn't seem to be happening today.
I opened my case to check the fans visually, and I've been hearing the fan rotation and it sounds... i don't know, a bit irregular ? But at the same time, it's the first time I opened the case, so I can't compare with a non-problematic situation.

My first question would be : Is it normal that sometimes, the CPU fan goes down to 0RPM ? Though, even when HWMonitor shows 0RPM (rarely), it is actually spinning, just... slowly.
Another question would be : Is it normal the same fan usually stands at 500RPM ? Should it be more ?

All in all, my CPU temp ranges from 50° to 80°. When it reaches that point, it doesn't seem to get hotter but I usually quit my current task when it does so.

Everything seems to run smoothly. I just can't use ressource heavy programs/games (like Overwatch or any other 3D game), the CPU usage skyrockets to 100%.
Other less demanding games (2D) or regular apps seem to work just fine.

I guess I shouldn't use demanding apps on this PC right now, but my last question would be : Until I (thanks to you !) find a solution, would you think it's a bad idea to use that PC for small tasks (like.. wrinting mails, browsing...)

Thank you so much if you can help me ! Sorry if I forgot important informations, I'll complete if needed :)

Last edited:


Mar 17, 2006
Personally, I'd update the BIOS (this will force it to reset too) and if you still get strange results, change the CPU fan - I expect its axis to be clogged with some crap that interferes with its proper rotation speed. When that happens, the axis usually wears down very quickly making the fan wobbly - and you'd need to change the fan.

Your computer seems to be using a custom design CPU fan, so try and find a cheap aftermarket cooler+fan for your processor and replace the whole assembly.

The Arctic Alpine 12 should do nicely - you can find it for less than 10 bucks on LDLC France.
Jul 1, 2019
Hello mitch074,
I'm going to try that.
And I forgot to mention : I cleaned the fan as much as I could (but I'm not sure I can clean the axis, so.. that might be that)
Thanks for your reply !