AMD Claims Arm ISA Doesn't Offer Efficiency Advantage over x86

Re:AMD Claims Arm ISA Doesn't Offer Efficiency Advantage ove... by audunw on Tuesday September 09, 2025 @06:18AM (#45180012)

I don’t know how it is for Apple-M, but for chips I’ve worked on, this can definitely relate to PMIC/VRMs. You can tune the voltage you feed to the various power domains based on the clock speed required for those domains at any given time. We do it with on-chip power regulators, but I suppose for Apple M it would perhaps be off-chip PMICs feeding power into the chip.

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Re:AMD Claims Arm ISA Doesn't Offer Efficiency Advantage ove... by mrheosuper on Tuesday September 09, 2025 @07:28AM (#45180507)

it's the other way around. You design PMIC for a given CPU, not designing CPU for a given PMIC(but in Apple case, the engineers can work closely together to come up with something balance).

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Re:AMD Claims Arm ISA Doesn't Offer Efficiency Advantage ove... by gimmeThaBeet on Tuesday September 09, 2025 @10:34AM (#45182511)

I always wondered how to gauge how effective Apple's Dialog carveout was, in terms of was it just instant PMIC department or even effective at building a foundation for them? Given their long relationship, I would think it might be pretty seamless.

I assume Apple probably do that more than I know, it is just interesting that their vertical acquisition history feels the most boring and the most interesting.

At least looking from the outside, it feels like relatively small pieces develop into pretty big differentiators, like P.A. Semi, Intrinsity and Passif paving the way to their SoCs.

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