"It'd be this really thick, heavy notebook, and it would be loud as all get-out," said Kevin Krewell, editor in chief of the Microprocessor Report. "Those would not be design choices that Apple would want to pursue."
The main thing holding back a G5 PowerBook is the chip itself. IBM technical documents show that when running at 2.5GHz and 1.3 volts, the chip consumes a maximum of 100 watts of power, a fair amount of juice for a notebook. However, its power consumption can be reduced by lowering its clock speed or reducing its clock speed along with its voltage, IBM documentation shows.
Thus, to fit the G5 into a typical PowerBook-size chassis, Apple would have to throttle down the G5, causing the chip to run more slowly than current G4 mobile chips
uniserver wrote:yeah the G4 you could clock that monkey up there. didn't they top out at like 1.67 in the G4 Powerbook?
But the kicker for IBM and its customers is that the PowerPC 970FX is a one-size-fits-all architecture that accommodates servers as well as notebooks.
"The portable-space specs that are out there talk about 15 to 30 watts for maximum power. We want to be inside that envelope," Rohrer said. "The low-frequency operating conditions in the idle state?nap?are in the 1- to 2-watt range."
That will mean that any G5 notebooks will likely be clocked somewhat lower than the current G5 desktops.
In one hypothetical example of a low-power state, Rohrer said a PowerPC 970FX in the 1/64 "deep nap" state could run at 30MHz, which would equate to about 1.9GHz in full-speed mode. Apple's shipping dual-processor G5 desktops range in speed from 1.8GHz to 2.5GHz.
"That's the whole intention of this, to make it usable in low-end servers ... down into portables," Rohrer said. "To do that, you can't start with high voltage and high frequency; you can't hit 50 watts. You've got to start with a lower voltage and lower frequency and [then] adjust the voltage and drop the frequency."
TheMacGuy wrote:1.4 DD2.0, 45W (P2).
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