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Lors de sa keynote annuelle il n'y a que quelques semaines de cela, Apple a une nouvelle fois avanc\u00e9 que son processeur Apple A10 Fusion distan\u00e7ait de loin ses comp\u00e9titeurs de l'univers Android. Probl\u00e8me \u00e9tant qu'il ne s'agit pas d'un propos lanc\u00e9 au\u00a0d\u00e9bott\u00e9 : c'est bien le cas, et il va falloir que les fondeurs r\u00e9agissent \u00e0 celui-ci. Analysons la structure de ce nouveau SoC.<\/strong><\/p>\n

Il y a toujours eu sur le march\u00e9 une dualit\u00e9 permanente : celle des appareils Android, et des appareils Apple. Deux philosophies que tout oppose, mais qui se rejoignent en de nombreux points notamment en termes de design ou d'applications.<\/p>\n

L\u00e0 o\u00f9 la diff\u00e9rence se fait est principalement sur l'optimisation. Android a choisi la libert\u00e9 des utilisateurs, parfois \u00e0 outrance, tandis qu'Apple g\u00e8re d'une main de fer son \u00e9cosyst\u00e8me quitte \u00e0 suffoquer ses admirateurs.<\/p>\n

Plus proche de l'ultrabook que du mobile<\/h2>\n

Pour bien comprendre les performances de ce nouveau SoC, Linley Group<\/strong> s'est mis en t\u00eate de d\u00e9monter enti\u00e8rement celui-ci afin d'observer son architecture dans les moindres d\u00e9tails. Apr\u00e8s tout, Apple con\u00e7oit ses propres puces, il est donc difficile d'en conna\u00eetre les entrailles sans mettre les mains sous le capot.<\/p>\n

Pour son directeur, le constat est simple : “le nouveau CPU d'Apple est bien plus \u00e0 comparer aux coeurs x86 grand public d'Intel<\/em>” argumentant que le A10 d\u00e9livre des performances “presque identiques” aux processeurs Skylake :<\/p>\n

Les prouesses du CPU Apple commencent \u00e0 rivaliser celles d'Intel. En effet, l'architecture Hurricaine<\/em> [du SoC Apple A10 Fusion] pourrait facilement propulser des produits comme le MacBook Air qui utilise aujourd'hui des puces Intel \u00e0 faible consommation<\/em>“.<\/p>\n

\"apple-a10-fusion-taille\"<\/p>\n

Une architecture pens\u00e9e en couple<\/h2>\n

En somme, le A10 Fusion est au niveau… d'un Intel Core i5 mobile<\/strong>. Ou du moins ses 2 coeurs Hurricane, qui sont les coeurs charg\u00e9s des t\u00e2ches\u00a0les plus lourdes tandis que les 2 Zephyr se chargent des t\u00e2ches les plus simples et sont \u00e0 consommation r\u00e9duite.<\/p>\n

C'est la possibilit\u00e9 pour le syst\u00e8me de passer dynamiquement des coeurs Zephyr aux coeurs Hurricaine<\/strong> qui lui donne une meilleure optimisation des t\u00e2ches. Ceux-ci suivent en effet l'architecture big.LITTLE que pr\u00e9conise ARM.<\/p>\n

La grande diff\u00e9rence du design d'Apple r\u00e9side dans la taille des coeurs utilis\u00e9s, selon ce d\u00e9montage. En effet, les coeurs Hurricane sont tr\u00e8s grands, proches du double des SoC concurrents<\/strong> \u00e0 4,18mm2. M\u00eame les Zephyr, orient\u00e9s sur une faible consommation \u00e9nerg\u00e9tique, sont “presque 2 fois aussi grand que des Cortex-A53<\/em>“.<\/p>\n

Cela ne se traduit pas forc\u00e9ment en puissance brute, mais plut\u00f4t en efficacit\u00e9. Un plus grand circuit int\u00e9gr\u00e9<\/strong> est plus co\u00fbteux, \u00e9videmment, mais ne change rien \u00e0 la puissance au m\u00e8tre carr\u00e9. Les puces Apple peuvent par contre g\u00e9rer plus d'instructions par cycle, donnant leurs v\u00e9locit\u00e9s.<\/p>\n

\"apple-iphone-7-7-plus\"<\/p>\n