Using a underpowered pelt on purpose - Page 2

Spinoza · 07-16-2001, 08:47 PM

Heat and Power Usage go up with the Square of the frequency... all other things equal.

Butcher · 07-17-2001, 03:31 AM

Isn't it down with square of frequency hence switch mode power supplies running at much higher frequency than standard AC line frequency (200KHz ish vs 50 or 60 Hz).

Spinoza · 07-19-2001, 05:04 PM

I was going for the short version. I was referring to CPU heat generation going up with the square of the freqency. This is why raising the voltage is key to big overclocks. Sure.. at stock voltage there's a little play in the activation level of the transistors... but not much... if you raise the frequency more energy goes into heat, soon there's not enough energy left to run the chip and instablility insues.
Yeah yeah.. I know all the physics of this.. I'm going for the non-EE version.

Butcher · 07-20-2001, 08:52 PM

It's normally reckoned that heat is linear with frequency and square with voltage...

Spinoza · 07-21-2001, 12:24 AM

My god... You are absolutly right. I had it backwards. Thank you for the correction.

vfrjim · 07-22-2001, 10:09 PM

I found a great article on Peltiers I think most people will enjoy, sorry if it was posted previosly,
http://www.tellurex.com/resource/txfaq.htm

Read article 45 on underpowering a peltier.

Jim

07-16-2001, 08:47 PM	#26
Spinoza Cooling Neophyte Join Date: Jun 2001 Location: Upstate NY Posts: 42	Heat and Power Usage go up with the Square of the frequency... all other things equal. __________________ Thunder K7 Athlon 1800's Danger Den/Ehiem to cool jig of RAM http://www.cs.oswego.edu/~vito/complete.jpg

07-17-2001, 03:31 AM	#27
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	Isn't it down with square of frequency hence switch mode power supplies running at much higher frequency than standard AC line frequency (200KHz ish vs 50 or 60 Hz). __________________ Once upon a time, in a land far far away...

07-19-2001, 05:04 PM	#28
Spinoza Cooling Neophyte Join Date: Jun 2001 Location: Upstate NY Posts: 42	I was going for the short version. I was referring to CPU heat generation going up with the square of the freqency. This is why raising the voltage is key to big overclocks. Sure.. at stock voltage there's a little play in the activation level of the transistors... but not much... if you raise the frequency more energy goes into heat, soon there's not enough energy left to run the chip and instablility insues. Yeah yeah.. I know all the physics of this.. I'm going for the non-EE version. __________________ Thunder K7 Athlon 1800's Danger Den/Ehiem to cool jig of RAM http://www.cs.oswego.edu/~vito/complete.jpg

07-20-2001, 08:52 PM	#29
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	It's normally reckoned that heat is linear with frequency and square with voltage... __________________ Once upon a time, in a land far far away...

07-21-2001, 12:24 AM	#30
Spinoza Cooling Neophyte Join Date: Jun 2001 Location: Upstate NY Posts: 42	My god... You are absolutly right. I had it backwards. Thank you for the correction. __________________ Thunder K7 Athlon 1800's Danger Den/Ehiem to cool jig of RAM http://www.cs.oswego.edu/~vito/complete.jpg

07-22-2001, 10:09 PM	#31
vfrjim Cooling Neophyte Join Date: Jul 2001 Location: Rhode Island Posts: 77	I found a great article on Peltiers I think most people will enjoy, sorry if it was posted previosly, http://www.tellurex.com/resource/txfaq.htm Read article 45 on underpowering a peltier. Jim

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