[discotronic]

Can I put a 733MHz Quicksilver (1999) in a Digital Audio 500MHz without any mods? I did a search and really didn't find an answer to my question.

[QuadG5Man]

I'm pretty sure you can. Like 90%

Anyone else confirm?

[hookem2oo7]

I know the DAs came in a 733MHz variety, and that they are VERY similar to the QS G4s on the inside, so I agree...

[discotronic]

I am thinking the same thing but want to be sure.

[Tuoder]

Did you give it a thorough look through?

[discotronic]

Originally Posted by Tuoder 

Did you give it a thorough look through?

Give what a thorough look through?

[IceEnclosure]

There's no such thing as a Digital Audio 500MHz model.

There's 466, 533, 667, and 733MHz models only.

apple-history.com

[IceEnclosure]

Originally Posted by discotronic 

Can I put a 733MHz Quicksilver (1999) in a Digital Audio 500MHz without any mods?

Oh, and Quicksilvers came out in late 2001, Digital Audio models came out in early 2001.

[discotronic]

Originally Posted by IceEnclosure 

There's no such thing as a Digital Audio 500MHz model.

There's 466, 533, 667, and 733MHz models only.

apple-history.com

Sorry, it is the 2001.

The 500MHz is whatever this model (AGP?) is called:

Apple Power Macintosh G4/500 Specs @ EveryMac.com

[Tuoder]

Originally Posted by discotronic 

Give what a thorough look through?

to make sure everything is amthed up

[discotronic]

Originally Posted by Tuoder 

to make sure everything is amthed up

Quit being an ass. You could have been like IceEnclosure and corrected my mistakes. Also, is amthed a real word? According to Dictionary.com is is not.

Anyway, does anyone know the answer? Any advice is appreciated.

[discotronic]

Originally Posted by KassandraE 

Search for great gift offers here. Cheap alpaca sweaters, and many many many beautiful crafts.

LOL

I got spamed.

[Lateralus]

It is technologically possible, but it'd require some work to have any real benefit.

Because the G4 CPU daughtercards are multiplier locked by default (in this case 5.5x) you'd be locked down to 550MHz.

133 x 5.5 = 733, so 100 x 5.5 = 550

In order to get past 550MHz, you'd have to reposition a few resistors on the daughtercard to increase the multiplier.

But I really don't think it's worth the effort;

Your current 500MHz chip is a 7400 series PowerPC. Without a doubt the most efficient member of the G4 family, largely because it is a 4-stage pipeline CPU. But because the short pipeline stage hinders the ability to ramp up clock speed, Motorola introduced the 7-stage 745x/744x G4 family, which was introduced with the QuickSilver.

Because of the increase in pipeline length, a 500/533MHz 7400 series G4 can run pretty much neck and neck with a 733MHz 745x/744x series G4.

To make up for some of the lost efficiency that came with increasing the pipeline length, Motorola rolled out L3 cache as one of the capabilities of the 744x/745x line. But the 733MHz QuickSilver didn't have any. Meaning that in addition to being less efficient per clock than the 500MHz 7400 you currently have, it didn't have any fallback in the form of an L3, making it one of the least desirable of any Mac CPU.

If I had a hundred 733MHz QuickSilver CPUs drop into my lap, I would have no reservation to handing them out as halloween goodies.

So, in short. It's not worth the effort with a L3-less CPU, and even if you put the effort into increasing the clock multiplier for a decent clock speed, you'd still wish you hadn't.

[IceEnclosure]

Originally Posted by Lateralus 

If I had a hundred 733MHz QuickSilver CPUs drop into my lap, I would have no reservation to handing them out as halloween goodies.

So, in short. It's not worth the effort with a L3-less CPU, and even if you put the effort into increasing the clock multiplier for a decent clock speed, you'd still wish you hadn't.

And that about answers my question on whether I should snatch the processor out of this (spare parts)733 QS and install it into my 533 DA G4.

: )

[Tuoder]

Originally Posted by discotronic 

Quit being an ass. You could have been like IceEnclosure and corrected my mistakes. Also, is amthed a real word? According to Dictionary.com is is not.

Anyway, does anyone know the answer? Any advice is appreciated.

Whoh jeez sorry. I wasn't trying to be an ass. I was just typing tired and not proofreading. I meant to say check if it looks like everything lines up. In my expirience, if the pinout is the same, the chip will usually work.

[hookem2oo7]

Originally Posted by Lateralus 

It is technologically possible, but it'd require some work to have any real benefit.

Because the G4 CPU daughtercards are multiplier locked by default (in this case 5.5x) you'd be locked down to 550MHz.

133 x 5.5 = 733, so 100 x 5.5 = 550

In order to get past 550MHz, you'd have to reposition a few resistors on the daughtercard to increase the multiplier.

Why would he be limited by the bus speed? The DAs had a 133MHz bus just like the Quicksilvers. Still, without L3, you may not get any gains like he said.

[discotronic]

Originally Posted by Tuoder 

Whoh jeez sorry. I wasn't trying to be an ass. I was just typing tired and not proofreading. I meant to say check if it looks like everything lines up. In my expirience, if the pinout is the same, the chip will usually work.

I apologize. I took what you where saying the wrong way. My bad.

[discotronic]

Originally Posted by Lateralus 

If I had a hundred 733MHz QuickSilver CPUs drop into my lap, I would have no reservation to handing them out as halloween goodies.

So, in short. It's not worth the effort with a L3-less CPU, and even if you put the effort into increasing the clock multiplier for a decent clock speed, you'd still wish you hadn't.

Thanks. I guess an OWC upgrade is in order.

[Lateralus]

Originally Posted by hookem2oo7 

Why would he be limited by the bus speed? The DAs had a 133MHz bus just like the Quicksilvers. Still, without L3, you may not get any gains like he said.

500MHz = Gigabit Ethernet, not Digital Audio. Meaning 100MHz.

[Tuoder]

Originally Posted by Tuoder 

Whoh jeez sorry. I wasn't trying to be an ass. I was just typing tired and not proofreading. I meant to say check if it looks like everything lines up. In my expirience, if the pinout is the same, the chip will usually work.

[imitchellg5]

It will work. 100%.

Originally Posted by Lateralus 

If I had a hundred 733MHz QuickSilver CPUs drop into my lap, I would have no reservation to handing them out as halloween goodies.

I'll take a few. Thanks Why would you do that with a pretty Quicksilver?

[IceEnclosure]

Originally Posted by imitchellg5 

It will work. 100%.

Well that's kinda mis-information, no? I've done some reading on the subject and regardless of what machine he's putting it in, there is either cutting involved (to clear the heatsink on the 733 chip) or some other issues (running a power wire through the 4th screw hole on the 733 board) before such a task is completed. Hardly an "it will work, 100%" situation.

Originally Posted by imitchellg5 

I'll take a few. Thanks Why would you do that with a pretty Quicksilver?

He said CPUs, not Quicksilver cases.

[rossde]

it will work ok, i have a 933mhz cpu in my 466 digital audio. it's easy to run the power to the fourth hole and just use the qs cpu and heat sink. no cutting involved, it just slots straight in. the power is just the 5 volt from a spare power outlet