Marc,

actually I am running speedfan and can even change fan speed with it,and this does not do anything to the noise. I've had the noise occurboth with CPU temps of 51°C and 36°C, depending on whether I insist onlow CPU fan speed or allow almost 3000rpm. I've completely stopped thechassis fan with no noise reduction, the only remaining fan is thepower unit fan, which is almost always at something around 900rpm. SoI'm almost sure it is something closer to what Duncan or Uwe suggest.

The Power Unit's supplier actually offered to replace the unit (a 430WBeQuiet Dark Power Pro), so I will next try out whether this helps, Isuppose. I am however wondering, whether this has a chance of beinghelpful, because some gaming people on the internet claim that theirASUS main boards make all power units squeak, while the same powerunits are completely quiet in connection with other boards.

Regards, Ulrike

---------- Original Message -----------
From: Marc Schwartz <marc_schwartz@comcast.net> 
To: Uwe Ligges <ligges@statistik.uni-dortmund.de> 
Cc: Ulrike Grömping <groemp@tfh-berlin.de>, r-devel@r-project.org 
Sent: Mon, 15 Jan 2007 13:08:08 -0600 
Subject: Re: [Rd] Whine in dual core Windows PC if R uses full CPU capacity

> "Spule":  Spool or coil perhaps?: 
> 
>  http://de.wikipedia.org/wiki/Spule_(Elektrotechnik) 
> 
> In addition to both Uwe's and Duncan's replies, it might be of value to 
> gather some additional empiric data, such as CPU Temps and Fan Speeds 
> and note if there is some threshold as to when this sound occurs. 
> 
> An application that I have seen referenced, but do not use since I am on 
> Linux is: 
> 
>  http://www.almico.com/speedfan.php 
> 
> but you may want to do further reviews before using. 
> 
> It is possible that even running at 100% CPU, as noted, there may be 
> certain types of operations that will result in higher CPU temps, 
> causing higher fan speeds. The sound may very well be coming from one or 
> more of the fans or housings in your system, as a result of vibration or 
> resonance. 
> 
> In most current generations of computers, there are multiple fans in the 
> system. One or more on the power supply, one or more on the CPU itself 
> and perhaps others within the case to enhance airflow and cooling. The 
> same is the case in laptops. 
> 
> HTH, 
> 
> Marc Schwartz 
> 
> On Mon, 2007-01-15 at 19:12 +0100, Uwe Ligges wrote: 
> > Ulrike, 
> > 
> > It can happen that different types of simulations and programs can put 
> > load on different regions of the CPU and comsume different amounts of 
> > power or simply are causing different patterns in the power consumptions 
> > 
> > 
> > Two things might cause the noise (at least, I have seen these things in 
> > Dortmund before), given in the order I would look at it at: 
> > 
> > 1. the power supply 
> > 2. some "Spule" (sorry folks, I don't know the english word) on the 
> > mainboard (in most of the cases ASUS is quite OK and does not produce 
> > such stuff) 
> > 
> > If the former, buy a better one, if the latter, you can put some paper 
> > or part of old cloth around it. 
> > 
> > Best, 
> > Uwe 
> > 
> > 
> > 
> > Ulrike Grömping wrote: 
> > > Dear R-developers, 
> > > 
> > > the following may seem a weird question for R-devel [UTF-8?]â€“ I try anyway, because it 
> > > does seem to be related to usage of R and R's way of interacting with the 
> > > hardware. 
> > > 
> > > When running R (2.4.0) on my new dual core Windows XP system (Intel Core 2 Duo 
> > > E6600, Mainboard ASUS P5B, BeQuiet Power Unit), I observe various types of 
> > > sounds (not related to fans) when running at full usage of at least one of the 
> > > cores. 
> > > 
> > > The most annoying sound [UTF-8?]â€“ a high-pitched noise like a whine [UTF-8?]â€“ I have so far 
> > > observed running simulations in R only and [UTF-8?]couldnâ€™t reproduce with any other 
> > > software (sometimes [UTF-8?]itâ€™s also more a rustle than a whine, that one is not 
> > > disturbing). I can clearly track it down to particular instances of R [UTF-8?]â€“ as 
> > > soon as I left-click on a blue window bar in the affected R-Gui, the noise 
> > > stops (and there are sometimes other instances of R running in parallel which 
> > > are completely unrelated to the whine). [UTF-8?]Iâ€™ve also stopped R when the computer 
> > > just whined and started SAS, fully using the CPU as well [UTF-8?]â€“ no whine. Shut down 
> > > SAS, restart R à whine again. Apparently, it can also be related to what 
> > > exactly R is doing at the particular moment. For example, I just discovered 
> > > that simulations of one type were finished, because the computer [UTF-8?]â€“ running 
> > > another simulation under full load on R in a quiet way [UTF-8?]â€“ started whining at 
> > > the moment it switched to the new type of simulation. 
> > > 
> > > The hardware technician [UTF-8?]Iâ€™ve asked about this issue does not have any idea and 
> > > suspects R to do something peculiar that causes the noise. [UTF-8?]Itâ€™s not the 
> > > mainboards fault (that has already been changed for another reason, and the 
> > > behavior remains). I [UTF-8?]canâ€™t definitely locate the source of the sound. I 
> > > suspect that [UTF-8?]itâ€™s the Power Unit, but there are so many parts close together 
> > > that I am not really sure. 
> > > 
> > > I do not know enough about interactions of R with hardware to know whether it 
> > > is even possible for anyone deeper into the matter to develop an idea what 
> > > could be behind this behavior. For the moment, I can get rid of the whine by 
> > > using the mainboard tool [UTF-8?]â€žAI [UTF-8?]Gearâ€œ to reduce the [UTF-8?]processorâ€™s speed from 2.4GHz 
> > > to 1.7GHz when I want to concentrate [UTF-8?]â€“ then the whine is gone (but the 
> > > simulation is slower). 
> > > 
> > > Does anyone have any idea [UTF-8?]â€“ or hints regarding what else I could think about ? 
> > > 
> > > Regards, Ulrike 
> > > 
> > > ****************************** 
> > > Prof. Dr. Ulrike Grömping 
> > > Fachbereich II 
> > > TFH Berlin 
> > > Luxemburger Str. 10 
> > > 13353 Berlin 
> > > mail: groemping@tfh-berlin.de 
> > > www: www.tfh-berlin.de/~groemp/ 
> > > ****************************** 
> > > 
> > > ------- End of Forwarded Message ------- 
> > > 
> > > ****************************** 
> > > Prof. Dr. Ulrike Grömping 
> > > Fachbereich II 
> > > TFH Berlin 
> > > Luxemburger Str. 10 
> > > 13353 Berlin 
> > > mail: groemping@tfh-berlin.de 
> > > www: www.tfh-berlin.de/~groemp/ 
> > > ****************************** 
> > > 
> > >   
> > > 
> > >     [[alternative HTML version deleted]] 
> > > 
> > > 
> > > 
> > > ------------------------------------------------------------------------ 
> > > 
> > > ______________________________________________ 
> > > R-devel@r-project.org mailing list 
> > > https://stat.ethz.ch/mailman/listinfo/r-devel 
> > 
> > ______________________________________________ 
> > R-devel@r-project.org mailing list 
> > https://stat.ethz.ch/mailman/listinfo/r-devel 
------- End of Original Message -------
 

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