[npeterh]

Hi,

What does Core Duo Temp show after the Logic board upgrade?
Right now I am showing 50-60 in idle and up to 75 with one or two apps running on battery.
Note I have 8610 1.86 original Logic board.

Thanks

/Peter

[Simon]

I have a week 12 2.0GHz board that isn't upgraded (yet). With room temp surroundings and AC power I get 60C when idle and 83C as peak temp.

[MacBookProJoE]

i believe mine is the 8609 with a 1.8 MBP. I just got it back form apple with a new inverter, new logic board and a new battery. Currently my idle temp is around 46. What are some good programs to get the cpu up to 100 so i can test it out?

-JoE

[Simon]

Originally Posted by MacBookProJoE

What are some good programs to get the cpu up to 100 so i can test it out?

Open a shell, type 'yes' and hit return. Open up another shell and do the same again. That should put both cores under full load.

[Tomchu]

A better way to max both cores out would be to run two instances of HandBrake or something. The 'yes' program alone piping to /dev/null (as people like to do) taxes only basic portions of the CPU.

[Simon]

Originally Posted by Tomchu

The 'yes' program alone piping to /dev/null (as people like to do) taxes only basic portions of the CPU.

What's that supposed to mean? And what's a "basic portion of a CPU" supposed to be? Multiple instances of yes put both cores under 100% load. Changing the type of call performed on the CPU is not going to change the heat load if the load is maxed out.

[Simon]

And just to add to that.

From http://en.wikipedia.org/wiki/Yes_%28Unix%29

"...It can also be used to test how well a system handles high loads, as using yes results in 100% processor usage, for systems with a single processor (for a multiprocessor system, a proccess must be run for each processor). This, for example, can be useful for investigating whether a system's cooling system will be effective when the processor is running at 100%...."

[Tomchu]

That is where you're wrong. Is "yes" using the SSE2 units? SSE3? FPU? What about division? What's the cache activity like?

Those portions of the silicon are sitting unused, and hence, the CPU is not generating as much heat as it could be, even though all of its clock cycles are being used up on "yes". Ask any chip engineer and they'll tell you the same thing. One clock cycle of addition is not the same as one clock cycle of some kind of SSE3 manipulation.

This is also the reason that companies like AMD and Intel have specialized software that puts their CPUs under a heat load that is greater than any normal piece of software could ever achieve. It does this by activating and using every available resource on the processor. They would never release this software, but trust me ... it exists, and they use it for stress-testing their products.

[MacBookProJoE]

well..just a day later after posting my previous message and recieving my MBP from apple care, my a letter decides to not work anymore. This is the worst when you just get your laptop thats been gone for a week, only to get it back with another problem. AHHHHH. anyways, i was unable to do any of the tests listed so... applecare now says it is taking another week to repare the damn keyboard.

-JoE

*crosses fingers.. hopefully i'll get it with no problems this time.*

[kpne1home]

I just received my MBP back from it's logic board fix and I've noticed it idles at about 55 C and when i make it at 100% cpu it shoots up to 80 C