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SkyCapt's picture
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Joined: 2017 Jan 11
G5 chip woes & the nature of 64-bit risc

Why did the G5 chip bellyflop? The world's first 64-bit consumer cpu looks fraudulent, like it's really a twin 32-bit cores which pretends (thanks to being risc not cisc) to be 64-bits per cycle by daisychaining the two cores whenever necessary.

The transistor count of the first G5 is 2X that of a contemporary 32-bit cpu. The power consumption and heat output is also 2X 32-bits. The Mirror Door models' backward sidefan & unnecessary highheat seems to have paved the way for a bad G5, Apple turned off the napmode to reinforce dishonesty about a trend in high heat spanning from G4 to G5.

Inside this G5, Actual 64-bit instructions are a tiny percentage of total instructions, so basically the 2x32-bit G5 fools us when it contains an entire 32-bit cpu hidden and not under our control. That was those years 2002/2003.

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Troyd's picture
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Joined: 2014 Nov 14

The first? Alpha based computers were sold to end users years before the G5.

SkyCapt's picture
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Joined: 2017 Jan 11

Is a G5 CPU secretly/internally 2x32 bit CPUs - not 1x64 ?

Only one single iteration of production upgrade makes the difference. The 2nd G5 chip is overtly dual core. And, everyone does rather have multiple 64 bit cores rather than upgrading into fewer but still multiple 128 bit and 256 bit cores. One lonely iteration of chip upgrade is all that spans this difference I describe.

The power appetite, the heat generated, the transistor count, and the overall trend. Looks like a duck, quacks like a duck, waddles like a duck ...