![]() It’s meant to be entirely invisible to developers, and early big.LITTLE implementations worked in the same way. The iPad Air 2 and its A8X chip, Apple’s sole tri-core CPU to date, could reach 300 percent while performing the same tests.Īpple tells us that only two of the A10 Fusion’s cores can be lit up at any one time and that iOS automatically decides which tasks light up the low-power cores and which tasks hit the high-performance cores. None of them ever exceeded 200 percent CPU usage, or 100 percent for each logical core. iOS and its software still only “see” two logical processor cores, and I confirmed this in the Xcode Activity Monitor by running various demanding apps. Other iPhones report the same clock speed in both standard and Low Power Modes, which leads me to believe that enabling Low Power Mode makes the phone default to the slower cores.Ī10 Fusion may technically be a quad-core CPU, but in practice it’s still functionally a dual-core processor with two large, fast processor cores doing the heavy lifting, just like everything from the A9 going all the way back to the A5 ( RIP). The two low-power cores seem to run at about 1.05GHz based on Geekbench 4's CPU clock speed reporting while in Low Power Mode, though that's an educated guess and not gospel.The iPhone 7 Plus and iPhone 7 have essentially the same CPU performance, though the 7 Plus' GPU does appear to be a little faster.Apple’s high-level performance claims-that the A10 is 40-percent faster than the A9 and twice as fast as the A8-are more-or-less correct according to our tests. ![]()
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