CPU temperature different when LL than when TF

Schamschi · 2009-09-28, 20:47

I found out that when prime95 does trial factoring work, my CPU's temperature only goes up to around 60°C, and remains there for hours. But I just got assigned a LL double check, and I saw the CPU rocket up to about 65°C within a few minutes. The CPU load was 100% in both cases. Is this normal?

I have an Intel Celeron T1600 1.66GHz processor.

mdettweiler · 2009-09-28, 20:51

This is to be expected. TF performs mostly integer calculations, whereas LL, P-1, and ECM do mostly floating-point calculations; the latter tends to stress the CPU more since the FPU portion of the processor is used heavily, rather than being not used much at all as with integer calculations. This is why it's usually better to have unstable machines do TF than LL, because usually they can still be stable enough to do generally accurate TF work.

Nickyrash · 2009-11-11, 10:20

I just wanted to know that the cpu fan which we are installed on the can be reomved permanently with any other fan installied in the cpu.

joblack · 2009-11-17, 20:48

Quote:

Originally Posted by Nickyrash

I just wanted to know that the cpu fan which we are installed on the can be reomved permanently with any other fan installied in the cpu.

That's not recommended - if you want to have a silence system get a bigger cooler or do watercooling ...

2009-09-28, 20:47	#1
Schamschi Sep 2009 2² Posts	CPU temperature different when LL than when TF I found out that when prime95 does trial factoring work, my CPU's temperature only goes up to around 60°C, and remains there for hours. But I just got assigned a LL double check, and I saw the CPU rocket up to about 65°C within a few minutes. The CPU load was 100% in both cases. Is this normal? I have an Intel Celeron T1600 1.66GHz processor.

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2009-09-28, 20:51	#2
mdettweiler A Sunny Moo Aug 2007 USA (GMT-5) 3·2,083 Posts	This is to be expected. TF performs mostly integer calculations, whereas LL, P-1, and ECM do mostly floating-point calculations; the latter tends to stress the CPU more since the FPU portion of the processor is used heavily, rather than being not used much at all as with integer calculations. This is why it's usually better to have unstable machines do TF than LL, because usually they can still be stable enough to do generally accurate TF work.

2009-11-11, 10:20	#3
Nickyrash Nov 2009 2 Posts	I just wanted to know that the cpu fan which we are installed on the can be reomved permanently with any other fan installied in the cpu.