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Comment by yongjik | Hacker News Reader

Well, they did persuade HP to ditch their own homegrown PA-RISC architecture and jump on board with Itanium, so there's that. I wonder how much that decision contributed to the eventual demise of HP's high performance server division ...

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A lot, I think. PA-RISC had a lot going for it, high performance, solid ISA, even some low-end consumer grade parts (not to the same degree as PowerPC but certainly more so than, say, SPARC). It could have gone much farther than it did.

Not that HP was the only one to lose their minds over Itanic (SGI in particular), but I thought they were the ones who walked away from the most.

Am I right in thinking that the old PA-Semi team was bought by Apple, and are substantially responsible for the success of the M-series parts?

Acquiring P.A. Semi got them Dan Dobberpuhl and Jim Keller, which laid a good design foundation. However, IMO, I'd lean towards these as the decisive factors today:

1) Apple's financial firepower allowing them to book out SOTA process nodes

2) Apple being less cost-sensitive in their designs vs. Qualcomm or Intel. Since Apple sells devices, they can justify 'expensive' decisions like massive caches that require significantly more die area.

They also had years to keep improving the iPhone chips until they were so good at power efficiency that they could slap it into a laptop.

That’s much better than a decade of development with no product yet.

PA Semi (Palo Alto Semiconductor) had no relation to HP’s PA-RISC (Precision Architecture RISC).

P.A. Semi contributed greatly to Apple silicon, but the company has nothing to do with PA-RISC. In fact, their most notable chip before Apple bought them was Power ISA.

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