The Qualcomm Snapdragon 615 MSM8939 is a mid-range ARM cortex A53 based SoC largely for Android smartphones. Announced in February 2014, the Sd615 is one of the first 64-bit capable SoCs from Qualcomm. In addition to 8 Cortex-A53 CPU cores at up to 1.7 GHz, the SoC integrates an Adreno 405 GPU with a 2x 32-bit memory controller (LPDDR3-1600, 12.8 GB/s) and supports Wi-Fi (802.11ac), Bluetooth 4.0, UMTS, and LTE.
The processor comes from Qualcomm’s 6xx mid-ranger series which promises an upgrade from older Snapdragon 600 (Krait architecture).
But the things doesnt go really well for Sd615 implementations . Some of the major drawbacks of this SoC was extensive heating resulting in second issue Thermal throttling.
I have two devices powered by Sd615 SoC namely Xiaomi’s so called flagship for India Mi4i and Micromax’s subsidiary Yu televenture’s Yu Yureka. Both phone sports same hardware but with a slight change in clock speeds. Still both the phones heat equally well!
These screenshots are from Yureka and Mi4i respectively. See both the devices are underclocked from 1.7Ghz on Mi4i and 1.4Ghz on Yureka to 1.1Ghz still the CPU temps were touching 60C mark just after 5 mins of playing CoC( clash of clans).
Xiaomi did tried to control heating by throttling but it made the phone unusable in even moderate tasks like web browsing and casual gaming.
The same case was with Qualcomm’s flagship Sd810 chipset which was launched in 2015. Many flagship devices were based on this chip like , OnePlus 2, Sony Xperia Z3+, LG Gflex,etc.
All of the above devices were known to have serious heating issues which were either fixed by firmware upgrades or throttling the CPU.
In such cases issues were solved as their topmost priority because they were flagships, but the same behaviour was not seen for mid-rangers and many of them are still “THE HEATING MACHINES”.
These are my personal observations about a real problem . What do you think? Comment down below.