![]() ![]() Were the screens calibrated to the same brightness level for each iPhone 6s? Did each phone have the same apps installed and use the same operating system settings? What background processes were running on each phone? We've seen firsthand how changing just a few settings can affect benchmark scores by up to 15 percent, and that's before any apps such as Facebook, Instagram, or Twitter are installed that can wreak havoc with CPU benchmarks.įor this reason, Tom's Hardware has developed a rigorous testing methodology for obtaining accurate, repeatable performance results. The real issue is how the tests were conducted. The benchmarks themselves are perfectly valid tools for probing power efficiency. While Apple's assertion that the benchmarks being used to compare the two A9 versions do not represent real-world usage is accurate, that's not really the problem here. Our testing and customer data show the actual battery life of the iPhone 6s and iPhone 6s Plus, even taking into account variable component differences, vary within just 2-3% of each other. It's a misleading way to measure real-world battery life. Every chip we ship meets Apple's highest standards for providing incredible performance and deliver great battery life, regardless of iPhone 6s capacity, color, or model.Certain manufactured lab tests which run the processors with a continuous heavy workload until the battery depletes are not representative of real-world usage, since they spend an unrealistic amount of time at the highest CPU performance state. With the Apple-designed A9 chip in your iPhone 6s or iPhone 6s Plus, you are getting the most advanced smartphone chip in the world. This topic has already sparked discussion on several Internet forums, with users posting results from various benchmarks (primarily the Geekbench battery test) showing a definitive battery life advantage for the TSMC version, prompting Apple to issue the following statement: Because every A9 CPU core is required to run at the same max clock frequency, Apple's tolerance range for core voltage will necessarily be tighter. For example, there are three different versions of Qualcomm's Snapdragon 801 with integrated LTE baseband with maximum frequency ratings between 2.26 GHz and 2.45 GHz. Rather than scrapping processors that do not meet power/performance targets, manufacturers sort them into different frequency bins and price them accordingly. A few extra atoms here or a thinner deposition layer there can be the difference between an efficient, lower-voltage processor and a more power-hungry, higher-voltage one. Before we explore the performance and battery life of the different A9 versions, it's important to remember that even processors using the same process technology, or even cut from the same wafer, require different voltages to meet the same clock frequency target due to natural manufacturing variability.
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