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IDProjectCategoryView StatusLast Update
0002149SpeedFanOtherpublic2016-02-09 11:41
ReporterDuckDaffy Assigned Toalfredo  
Status assignedResolutionopen 
Platformx64OSWindowsOS Version7 SP1 Build 7601
Product Version4.49 
Summary0002149: BSOD when SpeedFan starting
DescriptionSome combination of Intel RAID driver (AHCI), VGA PCIe compatibility (?) and SpeedFan starting cause BOSD.

It seems when VGA 7970 is not detected then SpeedFan runs ok.
But when VGA 7970 is present, SpeedFan cause BSOD a few seconds after start.

BOSD error DRIVER_IRQL_NOT_LESS_OR_EQUAL, STOP 0x000000D1, iaStorA.sys.

GPU-Z and HWinfo64 works ok.
Additional InformationSATA Intel (Rapid Storage Technology) driver version
AMD Radeon driver version 13.4.
SpeedFan version 4.49.
All current OS updates installed.
TagsNo tags attached.
Motherboard ModelGigabyte GA-Z77X-UD3H, BIOS F17
Video Card ModelGigabyte GV-R797TO-3GD, BIOS F62



2013-07-21 19:58

reporter   ~0007261

Last edited: 2013-07-21 20:00

Hm, it is not always, I found more details.

PC power off (total) -> power on -> boot to OS -> SpeedFan start - probably always start correctly and SpeedFan not cause BSOD.

Then restart -> boot to OS -> SpeedFan start - sometime cause BSOD (90 %), sometime cause OS freeze (mouse stop, last image on monitor).

Then reset (by button) -> boot to OS -> SpeedFan start - again 95 % cause BSOD or freeze, but 5 % run correctly!

When once in OS SpeedFan starts correctly, then SpeedFan exit and run again have no problem.

I observe unknown system freezes like upper before, but not think about SpeedFan, because PC and VGA was overclocked, but freezes appear in idle too. Now is CPU, VGA and RAM at base clocks and connection with SpeedFan is obvious.

It is not truth (as I wrote before) that when VGA 7970 not detected then SpeedFan runs ok. Is important to say that my configuration have PCIe compatibility problems or PCIe initialization problem (MB BIOS?), because VGA was succesfully detected only every second reset. When VGA not detected, then integrated Intel VGA is used, but Radeon Standard VGA Device is suggested by OS. But in this error mode not work clock detection and another parameters read in GPU-Z like when VGA 7970 is detected well.

The point is that BSOD is observed even VGA 7970 is detected right or wrong, but when is detected right, then BSOD or freeze is 90 %, but when is detected wrong then BSOD or freeze is significantly lower, like 40 %.

BSOD was observed thru OCCT and SpeedFan source for monitoring too.

The joke is that today I got a lot BSOD and freezes, but yesterday and before not. I am not sure what is changed and why it is wrong now. Maybe some BIOS configuration (but default setting and another version F19j tested and not helped), may I install/updated some driver, may some collision SW installed (Gigabyte 3D Power?), but I am sure that no OS update installed. Maybe my VGA is going to hell. :)

Hope I found some solution...


2013-07-21 20:51

reporter   ~0007262

Last edited: 2013-07-21 22:08

Eureka! :)

Before rollback, Intel RST SATA driver version
power off (total) -> power on -> boot to OS -> SpeedFan start -> freeze -> reset -> boot to OS -> SpeedFan start -> BSOD -> reset -> boot to OS -> SpeedFan start -> freeze -> power off (total) -> power on -> boot to OS - SpeedFan start -> freeze

After roolback to Intel RST SATA driver version (25.2.2013)
power off (total) -> power on -> boot to OS -> SpeedFan start -> OK -> restart -> boot to OS -> SpeedFan start -> OK -> power off -> power on -> boot to OS -> SpeedFan start -> OK -> restart -> boot to OS -> SpeedFan start -> OK -> hard reset -> boot to OS - SpeedFan start -> OK!

Also version (18.3.2013) tested OK.

Full driver name: Intel(R) 7 Series/C216 Chipset Family SATA AHCI Controller - 1E02

So what next?
Is it error in Intel driver or in SpeedFan?


2013-07-21 21:33

reporter   ~0007263

It seems that problem is in Intel driver.
I share this information here.


2013-10-19 03:18

reporter   ~0007294

The same happens on Windows 8.1 with Intel RST (WHQL). The BSOD in RST drivers occurs when SpeedFan tries to scan SCSI.

When started with /NOSCSISCAN the issue does not occur.

I'm wondering if the issue is related to how SpeedFan probes SCSI bus? The RST drivers are WHQL qualified which I'd think were subjected to a lot of stress testing... But who knows.


2013-10-27 08:34

reporter   ~0007298

Same problem with Gigabyte GE-H77-WIFI board with installed Windows 8.1 and Intel RST


2013-12-08 16:27

reporter   ~0007306

Last edited: 2013-12-08 16:34

I can confirm speedfan 4.49 crashes the system on launch when using RST in Windows 8.1. It has done this on both my Ivy Bridge with 7 Series SATA controller as well as my Haswell system with 8 Series SATA controller.

Just tried /NOSCSISCAN, this fixes it for me as well.


2014-03-21 04:19

reporter   ~0007359

I also have run in to this issue running windows 7 x64. When I updated the intel storage software I immediately get a BSOD when Speedfan scans for Scsi. If I recall right it seemed that it mistakenly detects my C: drive (sata) as scsi and then the BSOD happens.

Adding the /noscsiscan solves my issue just fine. This is on an Lenovo x201 laptop


2014-04-13 20:55

reporter   ~0007382

Last edited: 2014-04-13 20:57

Also iaStoreA.sys Problem with BSOD

The "/NOSCSISCAN" Also works at my pc.


2015-03-27 21:22

reporter   ~0007796

Last edited: 2015-03-27 21:22

Gigabyte z77-D3H BSOD DRIVER IRQL NOT LESS OR EQUAL on Win 8.1 x64 with all updates. Before that, I installed 2+8 RAM. On 2GB RAM is OK
BIOS F22 (Last)


2016-02-09 11:38

reporter   ~0007958

Last edited: 2016-02-09 11:41

Maybe I can contribute a small bit to a proper solution for this issue, which is IMHO the same as 0002173. and isn't really solved as SpeedFan v4.51 simply omits SCSI Scan if iostorA.sys (the Intel rapid Storage Technilogy driver) is present.

I'm running Win7 Pro x64 on a MSI P67A-GD65 (B3) board, with SpeedFan v4.47, and a Samsung 850 EVO connected to the P67 platform controller hub (SATA). A few days ago I ran into this issue after updating both Intel RST and BIOS. The BSOD was clearly triggered by a BIOS feature I had just disabled: Intel Smart Connect Technology, which is capable of periodically waking up the system in order to perform updates. After I had disabled this feature in BIOS, Intel RST v12.7.0.1036 (and later) ctashed with that BSOD. Nailing it down to that version and feeding google with it finally made me aware that it was actually crashing with SpeedFan.

Well, to keep a long story short, the point is: Intels Smart Connect Technology acts like a workaround! Keeping it enabled in BIOS, I can run every version of SpeedFan before v4.51 in connection with Intel RST v12.7.0.1036 or later!! No problem, no BSOD, no nothing. it works like a charm. Until I disable Smart Connect again. Next time they both meet, its BSOD time again.

So, if you are affected by this bug, and your BIOS holds Intel Smart Connect, try turning it on. Note that it's controlled by the OS, but you won't need to install the driver for it, you can even disable it within windows device manager, doesn't matter, it's the BIOS settung that counts. And Alfredo, I hope this discovery lets you find the time to look ino this matter again, maybe you will he able to apply the technical cause for this workaround into SpeedFan. :-)

Issue History

Date Modified Username Field Change
2013-07-21 18:02 DuckDaffy New Issue
2013-07-21 18:02 DuckDaffy Status new => assigned
2013-07-21 18:02 DuckDaffy Assigned To => alfredo
2013-07-21 19:58 DuckDaffy Note Added: 0007261
2013-07-21 20:00 DuckDaffy Note Edited: 0007261
2013-07-21 20:51 DuckDaffy Note Added: 0007262
2013-07-21 20:52 DuckDaffy Note Edited: 0007262
2013-07-21 21:19 DuckDaffy Note Edited: 0007262
2013-07-21 21:33 DuckDaffy Note Added: 0007263
2013-07-21 22:08 DuckDaffy Note Edited: 0007262
2013-10-19 03:18 saspus Note Added: 0007294
2013-10-27 08:34 alx491 Note Added: 0007298
2013-12-08 16:27 Cpuroast Note Added: 0007306
2013-12-08 16:34 Cpuroast Note Edited: 0007306
2014-03-21 04:19 warlord Note Added: 0007359
2014-04-13 20:55 dj1985 Note Added: 0007382
2014-04-13 20:57 dj1985 Note Edited: 0007382
2015-03-27 21:22 sams-sergey Note Added: 0007796
2015-03-27 21:22 sams-sergey Note Edited: 0007796
2016-02-09 11:38 Shield Note Added: 0007958
2016-02-09 11:41 Shield Note Edited: 0007958