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Apple Computing Products:
macOS - Desktop Hardware
G5 Overclocking
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<blockquote data-quote="SuB8HaVeN" data-source="post: 300801" data-attributes="member: 20214"><p>To tell you the truth, I don't think Freescale took PowerPC processors any farther than later G4-era speed. The last chips from Freescale/Motorola that Apple used were in their G4 Powerbooks since the G5 couldn't go mobile because of obvious heat issues. After that, Freescale has been concentrating more on using PowerPC in embedded systems and communications devices rather than computers. IBM had a lot more to do with with designing the PowerPC G5 than anyone else. When it comes to next generation PowerPC architecture, I think IBM is the lone ranger in development. I think the G5 was their Power6 processor, and Power7 is supposed to be some fantastical 10GHz processor or something. I'm not even sure if IBM is still developing Power7 because they really put a lot of their effort into their Cell processor. </p><p></p><p>Overclocking a G5? It's probably possible, but it may take someone who knows what they're doing a while to figure out what controls the multiplier/frontside bus and voltage. You can up the multiplier and overclock a CPU, in which it won't do any damage at all (it just won't work), but unless you raise the voltage you won't be getting anywhere. It could also be possible that the G5 uses an internal clock generator of some sort. If this is on-die the CPU, there's no way you will be able to overclock unless someone can figure out how to program it. If it is on the motherboard or processor board, someone could figure out how to make a different one and solder it in place of the original one. </p><p></p><p>That's a lot of effort for probably little gain. Unless you can use phase change cooling on the G5, even with water cooling you will never be able to hit 2.8-3.0GHz even with a 2.7- or 2.5GHz model. Things have changed a lot in the overclocking world, and boy do I miss the old days where you would just change around some dipsticks and cross your fingers while pressing the power button...</p></blockquote><p></p>
[QUOTE="SuB8HaVeN, post: 300801, member: 20214"] To tell you the truth, I don't think Freescale took PowerPC processors any farther than later G4-era speed. The last chips from Freescale/Motorola that Apple used were in their G4 Powerbooks since the G5 couldn't go mobile because of obvious heat issues. After that, Freescale has been concentrating more on using PowerPC in embedded systems and communications devices rather than computers. IBM had a lot more to do with with designing the PowerPC G5 than anyone else. When it comes to next generation PowerPC architecture, I think IBM is the lone ranger in development. I think the G5 was their Power6 processor, and Power7 is supposed to be some fantastical 10GHz processor or something. I'm not even sure if IBM is still developing Power7 because they really put a lot of their effort into their Cell processor. Overclocking a G5? It's probably possible, but it may take someone who knows what they're doing a while to figure out what controls the multiplier/frontside bus and voltage. You can up the multiplier and overclock a CPU, in which it won't do any damage at all (it just won't work), but unless you raise the voltage you won't be getting anywhere. It could also be possible that the G5 uses an internal clock generator of some sort. If this is on-die the CPU, there's no way you will be able to overclock unless someone can figure out how to program it. If it is on the motherboard or processor board, someone could figure out how to make a different one and solder it in place of the original one. That's a lot of effort for probably little gain. Unless you can use phase change cooling on the G5, even with water cooling you will never be able to hit 2.8-3.0GHz even with a 2.7- or 2.5GHz model. Things have changed a lot in the overclocking world, and boy do I miss the old days where you would just change around some dipsticks and cross your fingers while pressing the power button... [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
G5 Overclocking
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