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IDProjectCategoryView StatusLast Update
0002432SpeedFanHardware supportpublic2019-04-07 15:45
Reportersa5o Assigned Toalfredo  
Status assignedResolutionopen 
PlatformWindows OSWindows 8.1 ProOS Versionx64
Product Version4.52 beta 
Summary0002432: Incorrect CPU temperature on AsRock Z68 Extreme3 Gen3
DescriptionUnder load an incorrect CPU temperature is reported on the AsRock Z68 Extreme3 Gen3 motherboard. Idle temperatures seem fine (compared to OpenHardware Monitor and Core Temp), however, on load SpeedFan (4.51 as well as 4.52 Beta2) reports quite lower CPU temperature than other programs.

For example: when running OCCT CPU stress test for 10 minutes OHWM, Core Temp,
Argus Monitor and AsRock AXTU software all report CPU temperature around 45C (with temperatures increasing quickly), while SpeedFan reports CPU temperature only around 38C (and increasing slowly).

I planed using the advanced fan control to spin case fans according to CPU temperature and this prevents me to use the feature.
Steps To ReproduceRun CPU stress test and compare with other monitoring programs.
Also, when gaming MSI Afterburner reports different (higher) CPU
temperatures than SpeedFan - in SpeedFan CPU temperature barely icreases.
TagsNo tags attached.
Motherboard ModelAsRock Z68 Extreme3 Gen3
Video Card ModelMSI GTX970 Gaming



2015-09-26 22:54


Speedfan-OHWM_1-load.png (814,794 bytes)


2015-09-27 00:20

reporter   ~0007867

Speedfan report at start:

Win9x:NO 64Bit:YES GiveIO:NO SpeedFan:YES
I/O properly initialized
Linked ISA BUS at $0290
Linked Intel 6 Series SMBUS at $F040
Found nVidia GeForce GTX 970
Linked nVidiaI2C0 SMBUS at $3D403E3F
Linked nVidiaI2C1 SMBUS at $3D403637
Linked nVidiaI2C2 SMBUS at $3D405051
Scanning ISA BUS at $0290...
SuperIO Chip=Nuvoton NCT6776F
WARNING: bad Winbond($5CA3,$C1) identify (NCT6776F,W83677HG-I)
NCT6776F (ID=$C1) found (using SuperIO) on ISA at $290
Scanning Intel SMBus at $F040...
Scanning I2CNVidia SMBus at $3D403E3F...
Scanning I2CNVidia SMBus at $3D403637...
Scanning I2CNVidia SMBus at $3D405051...
Found Samsung SSD 840 EVO 120GB on AdvSMART
INFO : SCSI DISABLED by user or because iaStorA.sys is installed
Found Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz
End of detection
Loaded 0 events


2015-09-28 22:19


Untitled.png (723,703 bytes)


2015-09-28 22:25

reporter   ~0007868

Last edited: 2015-09-28 22:26

I uploaded a picture of default OHWM, custom OHWM (that shows the correct CPU
temperature, as well as the +5v voltage) and the CPUID HWMonitor. CPUID Hardware
Monitor shows the same CPU temperature as Speedfan (and default OHW), however,
it also shows a 4th sensor TMPIN3 that shows the correct CPU temperature - the
same as the custom OHWM and AsRock's AXTU software.

If you wish I can e-mail you the default and custom OHWM - maybe you can compare
what is the difference in the sensor settings. Let me know at


2019-01-15 16:26

reporter   ~0008803

That's what happens when a project becomes abandonware

Issue History

Date Modified Username Field Change
2015-09-26 22:54 sa5o New Issue
2015-09-26 22:54 sa5o Status new => assigned
2015-09-26 22:54 sa5o Assigned To => alfredo
2015-09-26 22:54 sa5o File Added: Speedfan-OHWM_1-load.png
2015-09-27 00:20 sa5o Note Added: 0007867
2015-09-28 22:19 sa5o File Added: Untitled.png
2015-09-28 22:25 sa5o Note Added: 0007868
2015-09-28 22:26 sa5o Note Edited: 0007868
2019-01-15 16:26 MaxusR Note Added: 0008803