You’ll have to wait for OS X Mavericks to realize these gains.Īpple also boosted overall battery capacity on the MacBook Airs by roughly 8%. Of all of the platform power optimizations, this is the only one that isn’t currently taken advantage of in OS X. I’ve talked about this extensively over the past several months, but it’s effectively a messaging system that allows all devices/controllers within a system to coordinate going into sleep states during periods of idle time. Haswell ULT also enables support for Intel’s Power Optimizer framework. Anyone else smell laptop/tablet convergence coming this way? Last year's model required 16 DDR3L devices, compared to 4 x 32-bit LPDDR3 devices here. Note the impact this has on DRAM device layout on the PCB itself. We’re still dealing with a 128-bit wide memory interface with a 1600MHz datarate. Overall bandwidth remains unchanged despite the move to very low power memory. Apple has historically not had an issue with spending a bit extra to get a better overall experience, so it’s not surprising to see the MacBook Air ship with LPDDR3. LPDDR3‘s power advantage is why it’s frequently used in smartphones vs. LPDDR3 on the other hand drops voltage even further (1.2V) while introducing architectural features to drive power down even lower. Standard DDR3 operates at 1.5V, while low-voltage DDR3L drops that down to 1.35V - the two standards are otherwise identical. The other big change, and one that Apple is among the first (only?) to take advantage of is Haswell ULT’s support for LPDDR3. Haswell ULT supports lower power sleep states (up to C10) than the standard mobile or desktop parts (C6/C7).
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. 8.12 Months Warranty + 30 Days REFUND Guarantee + 24 x 7 Email Support.With Haswell ULT, Intel aggressively focused on driving down total platform power consumption.7.Please check your 54.4Wh 7.6V battery for Apple MacBook MacBook Air 13-inch A1466(EMC 2925) part number or Laptop Models to ensure you are getting the correct battery for your laptop before placing your order!.6.When using the battery, care should be taken to prevent exposure and moisture.
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