CHUD tools Nap mode,

Question

Level 1

15 points

CHUD tools Nap mode,

Just installed CHUD tools 3.5.2 on my G4 dual 1.0 MDD. Previously it was locking up within minutes of boot, with temps running around 50-58 degrees celsius.

With nap mode enabled, temps are down in the 30's, as low as 32 degrees celsius!

This so far seems to have helped my G4 immensely. What exactly is nap mode doing that allows the processor temp to drop so much? Am I losing performance by doing this, or is it just making the CPU run that much more efficiently?

imac 24" 2.16 CTD - Logic 8, G4 400 Mix +++++ - ProTools, Mac OS X (10.5.4), Beige G3, mac iicx both still working and useful

Posted on Sep 28, 2008 12:18 PM

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Answer 1

japamac

Level 7

24,400 points

Sep 28, 2008 3:36 PM in response to MNMinstrel

Hi-

You could liken it to the accelerator pedal on a car engine. Push the pedal, and the engine speeds up. Take your foot off the pedal, and the engine slows down.

Nap Mode simply allows the CPU's to slow down when they can, rather than run at full speed all the time.
The slow down, or nap, reduces the power consumption, thereby the heat produced.

There isn't any performance hit by using nap mode. CPU response is instantaneous.
In fact, because the CPU's operate at lower temperatures, on average, performance is most probably helped by using nap mode. Hot processors don't work as well......

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Answer 2

MNMinstrel Author

Level 1

15 points

Sep 28, 2008 3:47 PM in response to japamac

Very cool, very cool. No pun intended.

I just did some rendering from Blender with it, didn't freeze and both CPU's were close to 100%. Temps never went over about 46 celsius.

It almost seems like apple deliberately put this timebomb into these machines, I was really close to just scrapping this machine and buying a mac pro.

One more question, how will this machine perform in OS9? I know it's going to only see 1.5GB of RAM and only use one processor, but will there be a heat problem in OS9? I'm hoping that replacing the craptastic aluminum heatsink with a copper one will help enough, because right now the processor gets too hot within 5 minutes of booting if I don't use nap mode.

And yet another question... I'm also having trouble finding a script for enabling nap mode at startup that actually works. Most of them are for tiger or leopard, I'm running panther on this machine.

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Answer 3

TTabby

Level 2

292 points

Oct 5, 2008 3:16 PM in response to MNMinstrel

I see that most of the G4's here are using 10.5.xx here,
I'm still using Tiger (10.4.11)
Chud does not seem to work anymore for me.
Is there a version that works with Tiger?

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Answer 4

CEB II

Level 2

475 points

Oct 10, 2008 3:59 PM in response to TTabby

I use Tiger and CHUD 3.5.2 with my MDD G4. Only problem with using it is that it makes sleep mode hit or miss. Sometimes it will work correctly, but usually it will lock up with Nap Mode activated.

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Answer 5

Nadav

Level 3

566 points

Oct 11, 2008 1:40 AM in response to MNMinstrel

to give u an example of how powerful nap mode is, my current cpu temp is under 95 degrees fahrenheit.

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Answer 6

Nadav

Level 3

566 points

Oct 11, 2008 1:42 AM in response to MNMinstrel

OS 9.2.2? It will perform nicely also, but you don't have the power to control the fan settings, or the fan control can't be altered. In other words, the fans will REV UP in OS 9.2.2 - my advice: if you really have to go into OS 9.2.2, do it from classic or sheepshaver.

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Answer 7

Nadav

Level 3

566 points

Oct 11, 2008 1:44 AM in response to TTabby

Hmm.. I'm not using 10.5. Wouldn't touch it with a 10 foot pole, at least not yet. Partially because all my software I have there isn't leopard updates for it. And of course, most of it is from tr*rts

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Answer 8

Nadav

Level 3

566 points

Oct 11, 2008 1:44 AM in response to CEB II

How does nap mode lock up your machine? I have been using it for the past 8 months and it hasn't locked up on me.

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Answer 9

CEB II

Level 2

475 points

Oct 11, 2008 3:55 PM in response to Nadav

My MDD G4 is set to automatically sleep after a set time period. If Nap Mode is active, it will often go into an unrecoverable sleep and have to be force restarted to use it again. This is a well known issue with Nap Mode and MDD G4s. I'm just glad it doesn't happen every time, since I use Nap Mode almost ever day in the summer (don't need it when outside temps stay below 70).

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Answer 10

Nadav

Level 3

566 points

Oct 11, 2008 4:39 PM in response to CEB II

And as I said.. this hasn't happened to me at all with my MDD. Perhaps, it loves nap mode?

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