iPhone 6S owners have found something to anxious about. Has my iPhone 6S a TSMC made A9 CPU or a Samsung made one?
Earlier this week reports about iPhone 6S tests from China triggered a discussion about wether iPhone 6S with TMSC made A9 CPUs are better than the iPhone 6S with Samsung A9 chips.
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The first test showed performance advantages of the TMSC A9 CPU. Newer tests showed comparable performance, but a gapping difference in battery life. In a test, the TMSC A9 had almost two hours more battery life. MacRumors has pulled all tests together in this report.
To find out which A9 CPU your iPhone 6S runs on, an app like Lirum Device Info Lite (free) is required. On the home screen of the app the model number of your iPhone 6S is displayed that gives away the manufacturer of the A9 chip. N66AP or N71AP means Samsung and N66mAP or N71mAP means that the A9 chip is made by TMSC.
Initially it was believed the Samsung chip would be better as it is based on newer 14-nm technology. The TMSC A9 is still based on the 16-nm technology.
The signs may though turn in favor again for the Samsung made A9 chip. A commenter on MacRumors says that an iPhone 6S running iOS 9.1 Beta 4 has a 20 minutes longer battery life than a iPhone 6S with TMSC chip running iOS 9.0.2.
It is believed that software can make a huge difference and that Apple is optimizing still code for both A9 CPU types. In the end Apple will aim at having no difference between the two A9 variants. This is will put iPhone 6S owners mind to rest. There is no iPhone 6S Batterygate or CPUGate just yet.
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There is also no real lab test yet that really delivers conclusive test results. The next iOS 9 release is likely changing the picture, if the forum comment is genuine.