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CPU Fan Jitter


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#1
MemphisEddie

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new Mobo New i5 ivy new PSU new case
CPU fan jitter on startup.
On start up the new i5 ivy cpu fan jitters (moves stops moves stops then runs normal)
The system works but I don't like the CPU fan jitter during startup.
Is there something I can do or something I missed on a new build?
i5-3550 Ivy Bridge 3.3GHz
GIGABYTE GA-Z77MX-D3H
G.SKILL Ares Series 8GB (2 x 4GB) 240-Pin DDR3
Rosewill FBM-01 Dual Fan case
Windows7
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#2
MemphisEddie

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Oh
PSU is not new but I put a min load on the PSU and jumped the green/black and multimeter checked each pin. All read good.
Thermaltake Pure 480W Power Power Supply
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#3
iammykyl

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Hi MemphisEddie. Posted Image


Check that the CPU fan cable and plug are not damaged and it is plugged in securely to the CPU fan header on the Motherboard.

Information on your PSU is a little sketchy on the web. Please check IF this is your PSU, > http://www.thermalta...14.asp#overview (efficiency is quite low, only 65%)

This from Newegg. > http://www.newegg.co...N82E16817153007
Please note, on the specs, 1 x Main connector (20 pin)


Your Motherboard, > http://download.giga...z77mx-d3h_e.pdf
The PSU may not be good enough to power the system properly. Can you test with a known working one, 500w or better?




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#4
MemphisEddie

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PSU is OK for what I have

It is a 480 watt but it is a bear bones system with one HDD one DVD no vid card no sound card no usb componets 1 case fan.

On line I worked out my power and I should hit about half of what the PSU can deliver.

Again I checked by hand each pin volts on the PSU using a HDD load and jumping the green/black.

The system boots and runs fine but CPU fan is jittery only on start up.

The CPU fan jumps or bumps once then jumps or bumps 2nd time then runs great.

It is a real odd deal.

I have never seen a CPU fan do that. But I have never biult a i5 ivy before.

Again

System runs fine but the CPU fan start up is strange.

Your right on thoug

That is my PSU and it is 20 pin but I use a 20 to 24 adapter.

I have a second power supply that is a 24 pin ATX that I tried on the new ivy i5/mobo and the odd start up is the same (jump jump run).

Edited by MemphisEddie, 24 September 2012 - 08:53 PM.

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#5
iammykyl

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Did You?

Check that the CPU fan cable and plug are not damaged and it is plugged in securely to the CPU fan header on the Motherboard.




If a fan is not receiving enough volts at starting, it can cause a non start or jumping.


Are you using a utility to manage fan profiles? or have you left them controlled by the BIOS setting?


You could of course have a dodgy fan. will give you a test if needed.


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#6
MemphisEddie

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Na everything is new but checked the plugs a few times.

No utilities added

I have not changed or even looked at the bios no over clocking yet.

I would like:

a fan test proceedure?

I read the stock i5 fan is prone to failure. But if it ever dies I will put in a water cooled system and then over clock.

But

Again

A fan test or procedure would be nice.

Edited by MemphisEddie, 25 September 2012 - 06:49 AM.

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#7
iammykyl

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Please see the image below for the correct attachment of the CPU fan and the rear fan.

I am using an online manual which may be slightly different layout from the one you have, so I can only give you the pages here for instructions.

I want to check setting in the BIOS before proceeding.
Restart computer and enter BIOS. find the relevant item by reading the user manual.
Please go to page P38 Mobo user manual, Thermal monitoring, set to Auto.
P41, PWM Phase Control,set to Auto.
Save settings and exit.
Wait for the computer to get to the windows screen.
Shut down and wait for the fans to stop.
Power on and see if the CPU fan is starting correctly. IF NOT.

Shut down.
Switch of the PSU.
Take anti static measures.
Remove the rear fan plug from the Sys-1 fan header.
Remove the CPU fan plug and attach to the Sys-1 fan header on the Mobo.
Turn on the PSU.
Power on and watch the CPU fan, does it start OK, it should run pretty fast.

Shut down.
Turn of the PSU,
Take anti static measures.
Replace the fan plugs to the correct fan header on the Mobo.

P43. PC Health status.

Edited by iammykyl, 26 September 2012 - 04:25 AM.

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#8
iammykyl

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Hi.
Just checking to see how you are progressing with you problem? An update reply would be most welcome.
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#9
MemphisEddie

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Rosewill FBM-01 Dual Fan
Case is small but not a SFF htpc
Just recieved
Silverstone Technology ML03B Slim HTPC - Desktop …
Picked up and in the process of case change added 2 HDD so no extra space It is a lot tighter fit but hope to have it running this week.
New case has no case fan so power use is lower less stress on PSU so added the 2nd HDD 2TB
Cal to 211watts with min 161watts PSU (was 218w min 168 w)
Also
I was working on what appeared to be an over scan on the 50" plasma
Windows 8 OS I would lose the lower tool bar and left tool bar
Tried to mod the resolution and the 50" plasma's aspect ratio to pick up the tool bars
No luck with that.
Windows 8 pre release has a scaling function!
It's just like the old cat ray tubes you don't mod the res or mobo bios or aspect ratio you change the scaling factor.
Windows 8 pre release lack of docs!
Will work on the CPU fan jitter this week.

Edited by MemphisEddie, 10 October 2012 - 09:21 AM.

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#10
iammykyl

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I do advice you install a rear exhaust fan, without some airflow in the case, you are in danger of cooking something.
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#11
MemphisEddie

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It is the way sff HTPC cases are designed.
They perferate the case on all sides. For a HTPC living room under a TV the case must be small like a DVD palyer or a reciever.
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#12
iammykyl

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OK. Did not realize it was for the front room.
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#13
MemphisEddie

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Living room HTPC as it stands now:
i5-3550 Ivy Bridge 3.3GHz
GIGABYTE GA-Z77MX-D3H
G.SKILL Ares Series 8GB (2 x 4GB) 240-Pin DDR3
2Tb and 1.5 Tb HDD
BD/DVD/CD drive
Thermaltake Pure 480W
Silverstone ML03B Slim HTPC
MS wireless Kb/Mouse
Windows 8
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#14
iammykyl

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Any results on the fan jitter yet?
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#15
MemphisEddie

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Later this week and I will test it a few times before I respond. I have looked at the reference and the online mobo manual and the paper copy are the same. Again End of the week I have to stuff this case and tie wrap the extra psu leads. I may just to clean up the build and improve air space by cutting off and capping all the extra PSU leads.
Any problems with cutting off and capping extra PSU leads?
It will limit the use of the PSU with other builds but I can't fore see a better system in the next 1 or 2 years and I find a 2 year old computer/cpu is not worth fooling around with.
2 years 2 old 2 slow 2 large.

Edited by MemphisEddie, 10 October 2012 - 08:07 PM.

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