G3 to G4

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Joined: Nov 4 2005
Posts: 43

Mhz for Mhz, how much of a speed difference is there under OS X?

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Offline
Joined: Jan 10 2006
Posts: 22
A lot...

Under OS9, there isn't much of a speed difference, but under OS X, there is a significant difference because of g4 optimizations and altivec optimizatios in OS X.

Figure on around 30-50% on a a Mhz for Mhz basis in OS X.

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Joined: Jan 20 2005
Posts: 700
i didnt even think there was

i didnt even think there was that much difference.....

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(dead) PB100, Q650, PB Wallstreet, beige G3, Imac snow 600, Ibook g4, SE30, (dead) IIsi, TiBook 667VGA, PBg4 1.5, MDD dual 1.25ghz, 1.8ghz g5 tower.
OS7.5 to 10.3.9. I LOVE CLASSIC MACS!

Reverend Darkness's picture
Joined: Dec 20 2003
Posts: 502
Re: A lot...

Maccess wrote:

Under OS9, there isn't much of a speed difference, but under OS X, there is a significant difference because of g4 optimizations and altivec optimizatios in OS X.

Figure on around 30-50% on a a Mhz for Mhz basis in OS X.

...for applications optimized to take advantage of Altivec, yes, but other than that, there won't be any significant increase in performance in OS X, either.

From everything I've been made to understand, the only major difference between the G3 and the G4 was Altivec capability.

For a list of apps optimized to make the most of Altivec optimization on a G4, click here, (this is by no means a complete list, but should be about 98% accurate). If you are not using any of these apps, then you won't see any significant speed difference.

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Eudimorphodon's picture
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Joined: Dec 21 2003
Posts: 1204
Re: A lot...

Reverend Darkness wrote:

...for applications optimized to take advantage of Altivec, yes, but other than that, there won't be any significant increase in performance in OS X, either...(snip)

...If you are not using any of these apps, then you won't see any significant speed difference.

I did a straight-across G3->G4 swap in my B&W G3 (400Mhz for both CPUs), and I will say *subjectively* OS X "feels" significantly faster with the G4. The various little bits of eye candy in the UI, like the window move/scale operations, bouncing icons, drop shadows, etc, etc, all seem to benefit from G4 optimizations. It's not a make or break thing, mind you, but it's definately there.

That said, I wouldn't spend any significant money on an upgrade for a G3 Mac. All the "upgradable" ones are officially "vintage" now, so expect the axe to fall on their necks during the next OS X upgrade cycle.

http://docs.info.apple.com/article.html?artnum=112142

--Peace