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Apple Computing Products:
macOS - Desktop Hardware
G5 Overclocking
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<blockquote data-quote="Avalon" data-source="post: 146590" data-attributes="member: 5184"><p>That is for the G4, but the G5 can't be overclocked.</p><p>The G4 had it's clockspeed that was a multiple of it's FSB, and by changing some resistances on the CPU board (soldering) you could change that multiplier.</p><p></p><p>The G5 works very differently, faster G5 CPUs have a faster FSB, while the multiplier remains the same (2x or 3x, depending of the model).</p><p></p><p>So changing the multiplier on a G5 (if it is even possible, which I doubt) would immediately fry the CPU, as it's clockspeed would rise way too much.</p><p></p><p>Little example:</p><p>PowerMac G4 running at 500MHz: FSB 100Mhz 5x</p><p>changing multiplier to 6x will make the G4 run at 600MHz</p><p></p><p>PowerMac G5 Running at 2GHz: FSB 1GHz 2x</p><p>changing that multiplier even just a half step to 2.5x means 2.5GHz...no CPU will survive such a raise without some serious cooling mods (no, simply liquid cooling it won't be enough).</p></blockquote><p></p>
[QUOTE="Avalon, post: 146590, member: 5184"] That is for the G4, but the G5 can't be overclocked. The G4 had it's clockspeed that was a multiple of it's FSB, and by changing some resistances on the CPU board (soldering) you could change that multiplier. The G5 works very differently, faster G5 CPUs have a faster FSB, while the multiplier remains the same (2x or 3x, depending of the model). So changing the multiplier on a G5 (if it is even possible, which I doubt) would immediately fry the CPU, as it's clockspeed would rise way too much. Little example: PowerMac G4 running at 500MHz: FSB 100Mhz 5x changing multiplier to 6x will make the G4 run at 600MHz PowerMac G5 Running at 2GHz: FSB 1GHz 2x changing that multiplier even just a half step to 2.5x means 2.5GHz...no CPU will survive such a raise without some serious cooling mods (no, simply liquid cooling it won't be enough). [/QUOTE]
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Apple Computing Products:
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G5 Overclocking
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