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Can Qualcomm's new Snapdragon 845 be more power efficient than a mid-range processor?

By Vijay Anand - 8 Dec 2017

Qualcomm's new Snapdragon 845 is more power efficient than a mid-range processor platform


 

Power efficient flagship processing platform

While we didn’t get a chance to quantify all the performance claims of the new Snapdragon 845 processing platform, Qualcomm did set up a demo booth at their Tech Summit to showcase power efficiency leadership. Indeed, over the course of the Qualcomm Tech Summit, as much as Qualcomm has highlighted on their performance leadership, they’ve stressed time and time again that much of the gain in performance and power efficiency is through re-architecting the processing blocks within the Snapdragon 845. And we got a glimpse of their power efficiency claims at their demo station.

First up, a reference Snapdragon 835 demo phone was pitted against a reference Snapdragon 845 demo phone on GFXBench, a unified cross-platform graphics benchmark. Power analyzers were set up to tap on the devices to chart voltage, current and other pertinent information.

Snapdragon 835 device on the left vs. Snapdragon 845 device on the right.

As seen in the above image, you might notice a drastic current draw difference while running the benchmarks between the two devices. However, the visible current draw stat is the actual real-time current draw and it’s not a good base of comparison for a test with very differing workloads every few seconds. The power analyzer data logger does report a more valuable stat in fine print – average current and average power draw over the duration of running the test for more than half an hour. Here’s what we noticed:-

From Snapdragon 835.From Snapdragon 845.

  • Snapdragon 835 average current / average power draw: 906mA / 3803mW
  • Snapdragon 845 average current / average power draw: 663mA / 2779mW

That’s 3.8W vs. 2.8W – close to 30% power savings, exactly what Qualcomm is advertising for Snapdragon 845’s power efficiency.

Now that we’ve established the Snapdragon 845’s power efficiency claims against the existing flagship, how does it measure up against a better known mid-range processor platform like the Snapdragon 660? Devices using this processor have usually had pretty good battery life stats, so Qualcomm decided to prove a point to challenge the Snapdragon 845 against it. For this test, they chose to run a 4K video at 30fps to accommodate the lower tier nature of the device.

4K video looping is a more consistent workload.

Note the power draw for Snapdragon 660 and 835 are fairly similar. However, Snapdragon 845 leads both of them – not by a large degree, but it nevertheless proves that it’s more power efficient than a mid-range processing platform. Peering into the average power draw stats also corroborates with the instantaneous power draw differences where the Snapdragon 845 is leading the charge.

Speaking of charging, Snapdragon 845 supports the very latest Quick Charge 4+ standard, which claims to be 15% faster and 30% more efficient than Quick Charge 4 that’s supported by default on Snapdragon 835. While the latter already boasts up to five hours of usage on just 5 minutes of charging, the newest QC 4+ offers 50% charge in just 15 minutes (based on a 2,750mAh battery based device). What’s more, QC 4+ is compatible with USB Power Delivery standard, so you can look forward to using more compatible chargers. Hit up this article for more details on Quick Charge 4+.

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