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Power Mac - History Question: Why Was 2.7 GHz PowerMac Discontinued?


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mac57

 
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By the time I bought my PowerMac G5, the line up consisted of a 2.0 GHz, a 2.3 GHz and a 2.5 GHz. I know however that there used to be a 2.7 GHz model. Why was this discontinued? Since it was the fastest of the bunch, it would seem that Apple would have wanted to push it. Any insights?

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IBM's PowerPC processor was being pushed beyond its limit already, and 2.7GHz was probably more than it was worth it as far as manufacturing and cooling goes. The PowerMac G5 was the only mainstream PC I know that had to be water-cooled. Manufacturing the 2.7GHz model was probably difficult, not to mention it ran even hotter than the already extremely hot 2.5GHz chip. All in all, Intel could release a 3.4GHz Core 2 Duo chip by simply ramping (rather overclocking) their 3.0GHz Core 2 Duo, but it just wouldn't be worth it because they would have to use higher voltage, in turn making it run hotter and cutting down on its life. Intel would also have to use cherry-picked dies off their wafers that would be able to hit 3.4GHz. All of this is just too much effort and pain to be worth having a chip that was just that much faster. Just my $.02...

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The dual-CPU 2.7GHz Power Mac G5 was replaced* as Apple's top-of-the-line G5 when the dual-CPU-dual-core 2.5GHz G5 ("G5 Quad") was introduced. At the same time, the slower dual-CPU models were replaced with same-speed single-CPU-dual-core models. The new dual- and quad-core machines also replaced the PCI-X slots with PCI Express slots.

The newer model also added other new features, like ECC memory, a workstation (nVidia Quadro) graphics option and dual ethernet cards. Since this was after Apple had announced the Intel transition, Apple pulled out all the stops to make their last PowerPC machines attractive. Everything that Apple could stuff into those last Power Macs was stuffed in.

*The dual-2.7 remained available for a limited time for customers who needed compatibility with PCI-X
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