1.25GHZ is just overclocked 1GHZ

[ex2bot]

KSV complained that we're bitching at new members for discussing overclocking. I think the point is that we're really sick to death of hearing people say, "I'm going to buy a Windows PC."

Boo hoo. I have a Windows PC. They're not that much to get excited about. I like my iBook better. Can't we talk about Mac's without people going, "Game Over, Man!" every other day?

[ksv]

Originally posted by itanium
They are rated at the speeds they are selling them at. Don't you understand these chips have been tested and found stable at 1.25 GHz?

You can't just pick out any 1 GHz G4 and run it at 1.25 GHz. These chips are "special."

Leave overclocking to the consumer? You'd have a lot of fried G4s then. Not a great idea.

Tell them these chips aren't really rated at the speed... blah blah? Anyway, why? They are rated for 1.25 GHz. They have been tested by Apple and found to run stable at these speeds.

If you'd bother to take a business class or 12, you'd learn through mass production, the process becomes refined, the good becomes better quality and the manufacturing costs reduce.

This allows Motorola to make faster G4s and charge less overall.

Have you ever thought through new manufacturing techniques and refinement the initial rating could change? Well that's a wild idea isn't it.

My iBooks battery is rated for five hours but thanks to power management, I can make it last seven. Damn Apple for lying to me!

Gaah! Read for yourself! Motorola has no 1.25 GHz chip.
http://e-www.motorola.com/webapp/sps...Id=01M0ylsbTdG
The chip Apple uses in both the dual 1 GHz and dual 1.25 GHz G4s is exactly the same one as they used in the dual 1 GHz Quicksilver, wchich means that if you buy a Quicksilver instead, you'll get a cooler running and easier to overclock CPU.

[kendall]

How do you overclock it. I wan't to run 867 MHz G4 at 1.25 GHz. Show me how.

Oh wait, you can't? I guess that 1.25 GHz G4 is worth a little more to me than that 867 MHz G4. Hmmm, go figure!

Your argument is weak, all CPU manufacturers do this. Why the sudden interest in Motorola?

Also, not all 1 GHz G4s will run stable at 1.25 GHz. What don't you understand about this. This is what makes the 1.25 GHz G4 special and worth the additional cost. Lower yield equals higher cost. Tada!

[plastic]

Well, in Japanese Mac Mod shops, they are always OC-ing this and that... and you can find loads of Japanese Mac Sites doing this (second largest market in the world for Apple) and what they do not show you is....

How long does the OC-ed G4 run stable? Tada! They can get a G4-1Ghz to run at 1.25 for an hour? And after a month? What happens? Fried? Nah, they will not tell you this... so I kinda have to support what itanium mentioned. These are more stable chips that was used in 1.25 towers.

I dun care if they have found a new way to OC a 400Mhz G4 chip to a 5Ghz G5... as long as it works, I will part with my money for it. Simple as that. I think Apple does a decent QC job.

My opinion. Dun bite me.

[ksv]

Originally posted by itanium
How do you overclock it. I wan't to run 867 MHz G4 at 1.25 GHz. Show me how.

Oh wait, you can't? I guess that 1.25 GHz G4 is worth a little more to me than that 867 MHz G4. Hmmm, go figure!

Your argument is weak, all CPU manufacturers do this. Why the sudden interest in Motorola?

Also, not all 1 GHz G4s will run stable at 1.25 GHz. What don't you understand about this. This is what makes the 1.25 GHz G4 special and worth the additional cost. Lower yield equals higher cost. Tada!

You're repeating yourself and ignoring my answers, and your arguments are self-contradicting. For the last time; we're talking about Apple, not Motorola.
And go back and read my posts once more.

Sure I can show you how to overclock your 867 MHz. But I can't guarantee it will run at 1.25 GHz without additional cooling. PPC7455 bus multiplier is set by R2, R5, R8, R4 and R10 where R2 is PLL CFG0, R4 PLL CFG1, R5 PLL CFG2. R8 PLL CFG3 and R10 PLL EXT. The resistors are located left to the processors. If you add a peltier with water cooling, or cool it with liquid nitrogen to lower resistance, sure you can clock it to 2 GHz+.
What Apple has probably done here is to add aditional cooling to make 1 GHz chip run stable at 1.25 GHz. That's $650 for four ugly holes in the front and an even more noisy fan which makes the computer sound like a jumbojet heading at full speed against the ground.
I'd rather invest 70 bucks in a peltier, thermal paste and some quality fans to make a 1 GHz Quicksilver run at even higher speeds than 1.25 GHz. Then I wouldn't have to pay three times as much for useless DDR RAM, either.

[ksv]

Originally posted by plastic
Well, in Japanese Mac Mod shops, they are always OC-ing this and that... and you can find loads of Japanese Mac Sites doing this (second largest market in the world for Apple) and what they do not show you is....

How long does the OC-ed G4 run stable? Tada! They can get a G4-1Ghz to run at 1.25 for an hour? And after a month? What happens? Fried? Nah, they will not tell you this... so I kinda have to support what itanium mentioned. These are more stable chips that was used in 1.25 towers.

I dun care if they have found a new way to OC a 400Mhz G4 chip to a 5Ghz G5... as long as it works, I will part with my money for it. Simple as that. I think Apple does a decent QC job.

My opinion. Dun bite me.

So it's guaranteed to be stable and all good when Apple does it?

[scruffy]

This is not hard, m'kay?

Apple buys many G4s from Motorola. Some are rated by Motorola at 1GHz, some at 867 MHz. Apple knows that the chips rated at 1GHz have not been tested at higher speeds, since 1GHz is the highest Moto will test at. So they test the 1GHz-rated chips at 1.25GHz. Some fail at 1.25 GHz. These they sell as 1GHz processors, since they are already rated (by Moto) at that speed. Some pass at 1.25 GHz. These they sell as 1.25 GHz processors (with extra cooling, since more Hz => more W => more heat).

Now, for the grand prize of not getting kicked in the ass by Leroy the arthritic mule, answer these questions:

a)What is the difference between chips sold by Motorola as 1GHz chips and those (re)sold by Apple as 1GHz chips?

b)What would be the likely result if we were to overclock to 1.25GHz, and leave running for more than an hour or two, the chips sold by Apple as 1GHz chips?

[ksv]

Originally posted by scruffy
This is not hard, m'kay?

Apple buys many G4s from Motorola. Some are rated by Motorola at 1GHz, some at 867 MHz. Apple knows that the chips rated at 1GHz have not been tested at higher speeds, since 1GHz is the highest Moto will test at. So they test the 1GHz-rated chips at 1.25GHz. Some fail at 1.25 GHz. These they sell as 1GHz processors, since they are already rated (by Moto) at that speed. Some pass at 1.25 GHz. These they sell as 1.25 GHz processors (with extra cooling, since more Hz => more W => more heat).

Now, for the grand prize of not getting kicked in the ass by Leroy the arthritic mule, answer these questions:

a)What is the difference between chips sold by Motorola as 1GHz chips and those (re)sold by Apple as 1GHz chips?

b)What would be the likely result if we were to overclock to 1.25GHz, and leave running for more than an hour or two, the chips sold by Apple as 1GHz chips?

No.
More MHz does not necessary mean more watts. A real 1.25 GHz can have exactly the same watt rating as a 1 GHz.
Motorola doesn't test each invidual processor.
It's likely that Apple doesn't, either. That could be the reason for the extreme cooling system. Sure, any processor can be run at high frequencies with proper cooling.

OK, to answer your questions;
a) If Apple does test each invidual processor, a 1 GHz chip from Motorola can potentially be run on higher frequencies that the ones you get from Apple, and the average temperature/wattage is lower because the ones from Apple are found to be unstable or not to run at all on 1.25 GHz with Apple's cooling.

b) Again, if Apple does test each invidual processor, that wouldn't work on a new DDR G4. With a Quicksilver CPU module, though, it could work just fine with good cooling (unless Apple did the same when they sold Quicksilvers, and have collected chips that can be run on 1.25 GHz for a long time).
I've overclocked a G3 from 300 to 440 MHz, and my current G4 from 400 to 500 MHz, and both of them still run perfectly stable.