It is currently Wed Sep 19, 2018 11:48 pm

All times are UTC - 8 hours




Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: Higher Temps = Higher Power Consumption?
PostPosted: Wed Sep 19, 2007 5:50 pm 
Offline

Joined: Mon Dec 15, 2003 10:29 am
Posts: 2299
Location: Bellevue, Nebraska
i was over at toms reading about a solar powered pc, when i noticed this graph they did.

http://www.tomshardware.com/2007/09/13/ ... page8.html

it shows that when they tried to passivly cool the processor, that their power consumption increased? By a quite a noticable amount too.

I didnt think method of cooling and the temp of the cpu had anything to do with the power consumed. Are they wrong in their analisys or have i missed something?


Top
 Profile  
 
 Post subject:
PostPosted: Wed Sep 19, 2007 6:06 pm 
Offline

Joined: Sun Oct 09, 2005 8:35 am
Posts: 1266
Location: Pleasanton, CA
I forget the formula, but yes, hotter chips do consume more power than cooler ones. The numbers quoted there are surprising though.

_________________
i7 4790K [email protected] GHz, ASUS Z97-PRO, 16GB G.Skill 2400C10, Intel 335 240GB SSD + WDC EFRX 1TB, Internal i7 graphics, Antec P180 case, Seasonic X-400 fanless PS, Megahalems CPU HS, Nexus 3-pin & AC PWM fans < 600 RPM, AcoustiPack foam, homemade ducts.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Sep 19, 2007 7:43 pm 
Offline

Joined: Thu Feb 10, 2005 11:20 am
Posts: 2198
Location: TN, USA
It was over double the load temp. You don't see people with Ninjas running a CPU at 86c. I'm assuming their "passive" test was with the stock HS not with a HS designed for passive use.

_________________
.
Please put a country in your profile if you haven't already.
This site is international but I'll assume you are in the US if you don't tell me otherwise.
RAID levels thread http://www.silentpcreview.com/forums/viewtopic.php?p=388987


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 20, 2007 5:58 am 
Offline

Joined: Fri Jun 02, 2006 8:17 am
Posts: 37
well, if you try to apply some non_silent_practise to this

given a active cooling, or water, at given Vcore your cpu can go to certain mghz.
if you drop the temp by a LN2, at the same Vcore it can go higher. its not because it likes cold, its because of Si. the higher the temp, the higher the electrical resistance. the higher the resistance at given Vcore, the higher the current draw...

when i switched from air to water, it aloved me to use 0.1V less Vcore at same speed.

so it can be true

_________________
"OCing and Noise comes hand in hand...
BUT not in my land ;)"
-- it's never silent enough --


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 21, 2007 4:46 am 
Offline

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 191
mad_man wrote:
when i switched from air to water, it aloved me to use 0.1V less Vcore at same speed.

Same here - or o/c a bit at stock voltage.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group