Undervolting my MBP (Brand new 2.8 Ghz 15")

[rmbrown09]

wow this reminds me of the problem I had with my old late 2008 umbp. The fans would refuse to ramp up even though the cpu temp hit close to 100 degrees C ... poor thing continued to cook itself until the fans finally ramped up when the temp hit 114 degrees C.

I thought Intel Built in thermal limits were supposed to shut you off at 110C, chip failure is supposed to set in there.

 

[kousuke18]

I thought Intel Built in thermal limits were supposed to shut you off at 110C, chip failure is supposed to set in there.

There were quite a few people who had the same problem. Just did a quick search and found this thread: https://forums.macrumors.com/threads/614147/ There's a similar thread in the apple discussion forum and people claimed that the problem was fixed after having their logic board replaced.

 

[Nuck81]

Do some decent gaming, boot into windows, or anything really intensive GPU or CPU wise and it'll happen.

Vent comes out behind the hinge.
most of the time fan speed stays low in OSx

I guess that's why.

I only use it it for general Internet use (surfing, email etc..) music composing and arranging (Finale and Sibelius) and some very light video editing.

 

[twilightrose]

I guess that's why.

I only use it it for general Internet use (surfing, email etc..) music composing and arranging (Finale and Sibelius) and some very light video editing.

For undervolting its best to look at the processor spec sheet to see the 'safe' voltage limits and work from there, also take into consideration the RAM, I'm not sure as much with the C2D, but with the iX series with the on-die memory controller, the voltage directly effects RAM performance.

Edit quote ment for TS

 

[rmbrown09]

For undervolting its best to look at the processor spec sheet to see the 'safe' voltage limits and work from there, also take into consideration the RAM, I'm not sure as much with the C2D, but with the iX series with the on-die memory controller, the voltage directly effects RAM performance.

Edit quote ment for TS

I wonder if coolbook will work for the new Arrandales??

 

[indg]

rmbrown09,
have you installed istat or some other app to make sure all the temp sensors and fans are working? i wonder if you need to do an smc reset.

here's a screenshot of my 2.33ghz mbp with fan control, coolbook, and cputest maxing out both cores of the cpu for 3 mintues:

depending on what the upper threshold is set at, the fans will spin up slower or faster (the red line on the graph).

ambient room temp is 67F.

here's a shot when cpu is idle:

 

[alphaod]

I thought Intel Built in thermal limits were supposed to shut you off at 110C, chip failure is supposed to set in there.

Yeah that is the thermal maximum, but the temperature reported often are inaccurate as well.

 

[rmbrown09]

rmbrown09,
have you installed istat or some other app to make sure all the temp sensors and fans are working? i wonder if you need to do an smc reset.

here's a screenshot of my 2.33ghz mbp with fan control, coolbook, and cputest maxing out both cores of the cpu for 3 mintues:

depending on what the upper threshold is set at, the fans will spin up slower or faster (the red line on the graph).

ambient room temp is 67F.

here's a shot when cpu is idle:

Yea that is an option , but I don't understand why all of a sudden my fans went on strike. Temp goes up, they just sit there. So i can't even tell if the undervolt is helping. (though I do note, it takes longer for the temp to climb)

with all these rumors of Arrandale on the verge, I might sell this sucker for 2300 and break even. Wait a bit again, and try this with Arrandale.