The combination of Haswell ULT CPU and PCH are both included in the new 15W TDP (there’s a 28W version as well but not used in the MacBook Air). Haswell ULT silicon itself is binned for lower voltage/power operation. The PCH also moves down to 32nm, helping further reduce power consumption. Bringing it on package reduces the amount of power needed to drive traffic between the CPU and PCH, which in turn helps reduce platform power. The PCH is responsible for all SATA, USB, PCIe 2.0 and other rest-of-system interfaces. Intel is being frustratingly cagey with giving up real details on exactly what’s going on with Haswell ULT, but here’s what I’ve been able to piece together.įor starters, Haswell ULT brings the PCH (Platform Controller Hub) on-package. It turns out that although Intel did a wonderful job of driving down CPU power consumption over the years, it did nothing to make the rest of the platform keep up. Peacekeeper just happens to let you run it on a loop so that it acts as a battery test.With Haswell ULT, Intel aggressively focused on driving down total platform power consumption. Peacekeeper’s primary purpose is to test web browser performance, so it has much more rigorous tasks that involve rendering videos, 3D graphics, web-based games, and more. Apple says its wireless web tests involve “browsing 25 popular websites,” and the company doesn’t get any more specific than that. The results for this test fell quite short of Apple’s specifications, but to be fair, this test is quite different from the one the company runs. 13-inch Retina MacBook Pro: Up to 10 hours.I used this to test what Apple calls “wireless web” battery life. The second test I ran was the Peacekeeper Universal Browser Test, which has a battery test component. Still, you’re going to be able to watch several movies or maybe even a whole season of “Game of Thrones” on a trans-Pacific flight. The MacBook was the only laptop that didn’t meet its specification, but it was only about 40 minutes short. 13-inch Retina MacBook Pro: Up to 12 hours.Apple’s specs for iTunes movie playback are: The first test I ran was a looped playback of a HD video in iTunes. Enable Power Nap while on battery power: Unchecked.Slightly dim the display while on battery power: Unchecked.
Put hard disks to sleep when possible: Checked.In Energy Saver system preference (Battery Tab):.Wi-Fi off for the iTunes movie playback test.Screen brightness set to 75 percent (starting at zero, press the screen brightness up button on the keyboard 12 times).
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