Linked by Thom Holwerda on Mon 5th Nov 2012 23:40 UTC
Apple Another Apple-to-switch-Macs-to-ARM post. "Apple engineers have grown confident that the chip designs used for its mobile devices will one day be powerful enough to run its desktops and laptops, said three people with knowledge of the work, who asked to remain anonymous because the plans are confidential. Apple began using Intel chips for Macs in 2005." No idea when Apple will make the switch, but they will do it. I'm thinking 5-10 year timeframe.
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A number of ARM CPUs would make a powerful machine, but (and I'm not expert) I don't think that would help much if the computer was doing one single heavy task. Multiple CPUs/cores can handle multiple processes, but I don't think they can join up to speed up a single process.

But I wouldn't mind being wrong this time.

Applications can use threads to take advantage of multi-CPU/multi-core sysems. This is not an issue specific to ARM and is very much an issue with x86 based systems as well.

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