One Article Review
| Source |  Errata Security |
|---|---|
| Identifiant | 1770293 |
| Date de publication | 2020-06-16 18:38:07 (vue: 2020-06-23 06:15:52) |
| Titre | Apple ARM Mac rumors |
| Texte | The latest rumor is that Apple is going to announce Macintoshes based on ARM processors at their developer conference. I thought I'd write up some perspectives on this.It's different this timeThis would be Apple's fourth transition. Their original Macintoshes in 1984 used Motorola 68000 microprocessors. They moved to IBM's PowerPC in 1994, then to Intel's x86 in 2005.However, this history is almost certainly the wrong way to look at the situation. In those days, Apple had little choice. Each transition happened because the processor they were using was failing to keep up with technological change. They had no choice but to move to a new processor.This no longer applies. Intel's x86 is competitive on both speed and power efficiency. It's not going away. If Apple transitions away from x86, they'll still be competing against x86-based computers.Other companies have chosen to adopt both x86 and ARM, rather than one or the other. Microsoft's "Surface Pro" laptops come in either x86 or ARM versions. Amazon's AWS cloud servers come in either x86 or ARM versions. Google's Chromebooks come in either x86 or ARM versions.Instead of ARM replacing x86, Apple may be attempting to provide both as options, possibly an ARM CPU for cheaper systems and an x86 for more expensive and more powerful systems.ARM isn't more power efficient than x86Every news story, every single one, is going to repeat the claim that ARM chips are more power efficient than Intel's x86 chips. Some will claim it's because they are RISC whereas Intel is CISC.This isn't true. RISC vs. CISC was a principle in the 1980s when chips were so small that instruction set differences meant architectural differences. Since 1995 with "out-of-order" processors, the instruction set has been completely separated from the underlying architecture. At most, instruction set differences can't account for more than 5% of the difference between processor performance or efficiency.Mobile chips consume less power by simply being slower. When you scale mobile ARM CPUs up to desktop speeds, they consume the same power as desktops. Conversely, when you scale Intel x86 processors down to mobile power consumption levels, they are just as slow. You can test this yourself by comparing Intel's mobile-oriented "Atom" processor against ARM processors in the Raspberry Pi.Moreover, the CPU accounts for only a small part of overall power consumption. Mobile platforms care more about the graphics processor or video acceleration than they do the CPU. Large differences in CPU efficiency mean small differences in overall platform efficiency.Apple certainly balances its chips so they work better in phones than an Intel x86 would, but these tradeoffs mean they'd work worse in laptops.While overall performance and efficiency will be similar, specific application will perform differently. Thus, when ARM Macintoshes arrive, people will choose just the right benchmarks to "prove" their inherent superiority. It won't be true, but everyone will believe it to be true.No longer a desktop companyVenture capitalist Mary Meeker produces yearly reports on market trends. The desktop computer market has been stagnant for over a decade in the face of mobile growth. The Macintosh is only 10% of Apple's business -- so little that they could abandon the business without noticing a difference.This means investing in the Macintosh business is a poor business decision. Such investment isn't going to produce growth. Investing in a major transition from x86 to ARM is therefore stupid -- it'll cost a lot of money without generating any return.In particular, despite having a mobile CPU for their iPhone, they still don't have a CPU optimized for laptops and desktops. The Macintosh market is just to small to fund |
| Envoyé | Oui |
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