Underclocking an iBook

K.O.Kiki

Right, first off the bat: when are you ever going to need all the horsepower of a Radeon 9550? The short answer is, I think you'll agree, never. So let's stop wasting valuable power on it.

1. Download ATIccelerator II. Install.
2. Go to the new panel in System Preferences and underclock that GPU & memory!
3. Done.

I've underclocked my GPU/mem by ±19% each, and, though I have yet to see a substantial difference in battery life, I am feeling lower temperatures!:)
So there ya go, a quickie on getting more for less.

Scráib

There's a new theory, that if you sit your laptop on your knee the heat it emits could make you impotent.

This could reduce the chances of that happening. Hurrah!

K.O.Kiki

Have I saved humanity?

Sarunas

Doesnt it already underclock it self automatically when its not used?

K.O.Kiki

Sarunas wrote:

Doesnt it already underclock it self automatically when its not used?

I think that's the processor.

Syth

Scr&#225 wrote: »

There's a new theory, that if you sit your laptop on your knee the heat it emits could make you impotent.

This could reduce the chances of that happening. Hurrah!

You'll notice no-one sells laptops anymore. They are all notebooks.

K.O.Kiki

Syth wrote:

You'll notice no-one sells laptops anymore. They are all notebooks.

Lappie is the affectionate name

Ocelot

Right, first off the bat: when are you ever going to need all the horsepower of a Radeon 9550? The short answer is, I think you'll agree, never.

Except for the World of Warcraft users....

SouperComputer

Handy little tool this. Used it to great effect with the wife's G3 iBook. Since the CPU & GPU share the same heatsink, there is a definate reduction in fan usage. Dont go too low on the RAM clock though, or you'll get artifacts.

Of course improves battery life a little too.

Depending on your other specs of your machine, you can get away with half or even less GPU clock unless you plan gaming of course! im at 70% GPu reduction with no noticable change in UI performance.

K.O.Kiki

Any idea what demands MPG/AVI video have? I'm running mine at -42%/-26% (121.5/136Mhz) for the while

Hmm... battery life lately does seem a little erratic to me lately, though. Not sure if it's Firefox demanding or not...

SouperComputer

K.O.Kiki wrote:

Any idea what demands MPG/AVI video have? I'm running mine at -42%/-26% (121.5/136Mhz) for the while

Not much a all. A DVD can get away with 2MB of VRAM without any problems. Aside form gaming, the first thing to slow down would be OS X's UI. with 70% reduction I haven't noticed a difference in the UI and of course, all DVD's/Divx video play fine.

K.O.Kiki

Hmm... gonna run it at 99/100Mhz (-53/-45%); see what that does...

SouperComputer

keep the RAM high or you might get artifacts.