power is not heat!
From: John R Pierce <[EMAIL PROTECTED]>
Reply-To: The Great Internet Mersenne Prime Search list <[email protected]>
To: The Great Internet Mersenne Prime Search list <[email protected]>
Subject: Re: [Prime] hot CPU!
Date: Wed, 16 Feb 2005 21:21:14 -0800
Jud McCranie wrote:I've had Prime95 running on a 2.4 GHz P4 for over a year (a Dell 4550). When I turn Prime95 on, I can hear the fan(s) speed up, but it keeps reasonably cool. I just started running Prime95 on a 3 GHz P4 with hyperthreading (a Dell 4700), and it shows 49-50% CPU usage. However, it makes the computer run very hot! The top of the case us warm to the touch, and the air coming out the back is almost like a hair dryer. If I stop Prime 95 for a while, it cools off to where the case is no longer warm and only a little hot air is coming out the back. When Prime95 is off on that machine, there is only a little more hot air coming out than my older computer with Prime95 running.
Is a 3GHz P4 supposed to be this hot? Is it bad for the machine?
those dells duct the heatsink directly to the main fan, and use a quite efficient very large main heatsink.
yes, a 3000 MHz processor consumes quite a lot of power when its working at full speed, and power is heat. the Dell is quite efficiently removing that heat from the processor by pumping it out. When the P4 is idle, it draws way less power, and generates less heat.
I believe a 3Ghz P4 is around 100 watts. Ever feel how hot a 100W incandescent lightbulb gets?
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