Before I am loading this app, can anyone please confirm that it enables our MBAs to run youtube videos for a longer period on low fan speed around 2500rpm?
And second question: lets suppose a task like watching flash or quicktime videos takes about 40 to 50 percent of cpu load at 1.6GHz. Will we be able to run this task on a cooler level when the unit is just manually set to .8 or 1.2GHz? I am still a bit afraid of doing this undervolting thing, but just lowering the cpu speed should definitely be a no risk, should it? Thanks!!
Undervolting I believe, just lowers the voltage to the chip but lets it run AT THE SAME SPECIFIED SPEED. So at the speed of say 1.6MHz, the chip runs cooler cos there is less voltage across the chip.
The second thing is throttling, the software I think checks on ur CPU load. If the load is low, it throttles down to a slower speed. This corresponds to an even lower voltage. This gives out EVEN LESS heat and consumes lesser battery. When the CPU load goes up, like watching a video, the throttling returns the CPU speed back to 1.6MHz, but applies the lower voltage. our chip runs like a normal 1.6MHx chip but runs cooler due to the lower voltage setting.
RMClock is the windows alternative. Its mentioned in several of these posts if you bothered to read them.
Video card won't be throttled since its not the same chip as the CPU.
Indeed, I've read previous posts and installed RMClock. I've set it to "maximum performance" at 1.6 GHz and linked a lower voltage to it. I've selected the "always on" Windows energy profile as well. That doesn't seem to work at all. It seems those RMClock settings are either not applied or overrided by something: I'm still having the same heat issue and my CPU is throttling bad (it's constantly stepping down to around 700 or 800 MHz).
I would like to keep the processor at 1.6 GHz all the time until it reaches 85 C temperature, provided I undervolt it. How can I do this in RMClock?
I have installed coolbook with the same settings as in the 1st post. I had a fullscreen quicktime .mov running, top in a terminal, an instance of Windows XP in Parallels doing a defrag and Entourage syncing in the background. I left it this way for about 20 minutes. The highest temp I saw was 71C.
What I find strange is that I rarely ever get up to 1600mhz with normal use...
I did use the "CPU Load" slider to force the CPU to 100% and have not yet hit 85C yet (~10 minutes), it hovers right around 78C.
If this software fixes the fan/heating issues then I wonder why
Apple didn't apply these settings and obviously they didn't but they are clearly aware of the issues so why don't they just release an update?
Also, will undervolting NOT reduce the performance on my computer or affect it in any other (negative) way ? Clearly there must be some kind of side effect when doing undervolting. So what is it?
hi to all,
What a great post... Thanks to the guy who started this subject and shared his expriences with coolbook. This is the magic of Macrumors: people comming from different places all around the World linked because of an Apple product and trying to help each others.
Even if I've carefuly read the post I don't get quite well how can this be true.
1 - I mean... I've a 1.8/80... What we undervolt with Coolbook is only the CPU, right? Will the FSB or the power somehow be affected (lower)?
2 - How low can you undervolt a 1.8ghz? I mean, I know that machines have different reactions, but what would you advice at best?
3 - Would I still be able to run heavy programs such as Cut studio express?
4 - Will the performances be better? Are the better permances felt in all programs (or just in little tasks)? If undervolting give us better performances why do some people overvolting (overclocking) instead of underclocking?
Thanks for your answers to my (stupid) questions!!!
Cheers.
I haven't read yet of a freeze (which is itself suprising as freezing can be very common with this proceedure). But the lowest 'undervolt' voltage is .9V, and I imagine if you where to go much lower you would certainly freeze it.
If this software fixes the fan/heating issues then I wonder why
Apple didn't apply these settings and obviously they didn't but they are clearly aware of the issues so why don't they just release an update?
Also, will undervolting NOT reduce the performance on my computer or affect it in any other (negative) way ? Clearly there must be some kind of side effect when doing undervolting. So what is it?
My 1.8/80 froze @ 1.6 & 1.8 w/ .9v and @ 1.8 with .9125. Next setting up for each respectively fixed that so far. I do wonder if these chips are better than Apple and Intel think. Even 1.8 @ .925v is a lot lower than the default.
It's just that Intel guidelines will be zero % failure rate , hence these default voltages.
At these lower voltages that failure rate is going to increase, probably dramatically at one point. Otherwise Intel would sell these buggers as ULV chips and jack the price up a hundred bucks.