P4 Temperature Throttle

Axel Fox · 2003-06-25, 10:27

Hello all,

I'm running Prime95 on a P4 Laptop, but it goes slower than my girlfriends Pentium III. I think this is because of the Temperature Throttle, because it goes pretty fast for a few minutes and then the throttle kicks in and lowers the CPU power of my Laptop because it's getting too hot.

That is what my question is about. I think that if I could set Prime95 to use only 75% of my CPU (for example), it would go slightly slower, but I think the Temperature Throttle will not kick in then, so in the end it would go faster than it does now.

So, is there any way to slow down Prime95 a bit to release the stress on my CPU so it doesn't get so hot anymore ?

Thank you,
Axel Fox.

xtreme2k · 2003-06-25, 11:54

I believe desktop P4 temp throttle comes in at 70C. Not 100% sure if this is the same for notebook chips.

Are you running your P4 mobile at a 'reduced power' mode where the P4 actually runs at less Mhz than it should be?

Matthes · 2003-06-25, 14:45

Hi,

in one of the newer versions (around 23.3 I believe) a prime.ini command called Throttle=n was implemented. n is the number of miliseconds the program will sleep after each iteration. That unfortunately does not affect the factoring part. But you could use SkipTrialFactoring=1 to not factor at all. Put both commands in the prime.ini in your prime95 directory and it should run cooler.

Hth, Matthes

Xyzzy · 2003-06-25, 16:28

http://www.mersenneforum.org/viewtopic.php?t=397

http://www.mersenneforum.org/viewtopic.php?p=2581#2581

http://www.mersenneforum.org/viewtopic.php?p=2582#2582

Axel Fox · 2003-06-25, 18:55

Ok, thank you all for your replies, I'll find some way to get speed up my P4.

And no, my laptop is nog running at reduced power.

2003-06-25, 10:27	#1
Axel Fox May 2003 60₁₆ Posts	P4 Temperature Throttle Hello all, I'm running Prime95 on a P4 Laptop, but it goes slower than my girlfriends Pentium III. I think this is because of the Temperature Throttle, because it goes pretty fast for a few minutes and then the throttle kicks in and lowers the CPU power of my Laptop because it's getting too hot. That is what my question is about. I think that if I could set Prime95 to use only 75% of my CPU (for example), it would go slightly slower, but I think the Temperature Throttle will not kick in then, so in the end it would go faster than it does now. So, is there any way to slow down Prime95 a bit to release the stress on my CPU so it doesn't get so hot anymore ? Thank you, Axel Fox.

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2003-06-25, 11:54	#2
xtreme2k Aug 2002 2·3·29 Posts	I believe desktop P4 temp throttle comes in at 70C. Not 100% sure if this is the same for notebook chips. Are you running your P4 mobile at a 'reduced power' mode where the P4 actually runs at less Mhz than it should be?

2003-06-25, 14:45	#3
Matthes May 2003 2³·3 Posts	Hi, in one of the newer versions (around 23.3 I believe) a prime.ini command called Throttle=n was implemented. n is the number of miliseconds the program will sleep after each iteration. That unfortunately does not affect the factoring part. But you could use SkipTrialFactoring=1 to not factor at all. Put both commands in the prime.ini in your prime95 directory and it should run cooler. Hth, Matthes

2003-06-25, 16:28	#4
Xyzzy "Mike" Aug 2002 2×23×179 Posts	http://www.mersenneforum.org/viewtopic.php?t=397 http://www.mersenneforum.org/viewtopic.php?p=2581#2581 http://www.mersenneforum.org/viewtopic.php?p=2582#2582

2003-06-25, 18:55	#5
Axel Fox May 2003 2⁵·3 Posts	Ok, thank you all for your replies, I'll find some way to get speed up my P4. And no, my laptop is nog running at reduced power.