The SDM845 Reference Platform and CPU Results
The Snapdragon 845 is Qualcomm’s latest flagship mobile platform, officially announced on December 6 and known officially as the SDM845 (moving from the MSMxxxx nomenclature of previous iterations). At a recent media event we had a chance to go hands-on with a development platform device for a preview of this new Snapdragon's performance, the results of which we can now share. Will the Snapdragon 845 be Qualcomm's Android antidote to Apple's A11? Read on to find out!
The SDM845 QRD (Qualcomm Reference Design) Device
While this article will focus on CPU and GPU performance with a few known benchmarks, the Snapdragon 845 is of course a full mobile platform which combines 8-core Kryo 385 CPU, Adreno 630 graphics, Hexagon 685 DSP (which includes the Snapdragon Neural Processing Engine), Spectra 280 image processor, X20 LTE modem, etc. The reference device was packaged like a typical 5.5-inch Android smartphone, which can only help to provide a real-world application of thermal management during benchmarking.
Qualcomm Reference Design Specifications:
- Baseband Chipset: SDM845
- Memory: 6 GB LPDDR4X (PoP)
- Display: 5.5-inch 1440x2560
- Front: IMX320 12 MP Sensor
- Rear: IMX386 12 MP Sensor
- No 3.5 mm headset jack (Analog over USB-C)
- 4 Digital Microphones
- Connector: USB 3.1 Type-C
- DisplayPort over USB-C
At the heart of the Snapdragon 845 is the octa-core Kryo 385 CPU, configured with 4x performance cores and 4x efficiency cores, and offering clock speeds of up to 2.8 GHz. In comparison the Snapdragon 835 had a similar 8x CPU configuration (Kryo 280) clocked up to 2.45 GHz. The SDM845 is produced on 10 nm LPP process technology, while the SD835 (MSM8998) was the first to be manufactured at 10 nm (LPE). It is not surprising that Qualcomm is getting higher clock speeds from this new chip at the same process node, and increases in efficiency (the new 10nm LPP FinFET process) should theoretically result in similar - or possibly even lower - power draw from these higher clocks.
Subject: Mobile | October 17, 2017 - 03:50 PM | Sebastian Peak
Tagged: SoC, Snapdragon 636, snapdragon, qualcomm, octa-core, mobile platform, Kryo 260, Kryo, cpu, adreno, 8-core
Qualcomm's latest mobile platform is the Snapdragon 636, positioned (at least numerically) between the Snapdragon 630 and 660 introduced earlier this year, and offering a very impressive set of features for mid-range devices - even reaching parity with the Snapdragon 800-series in some respects.
Qualcomm claims CPU performance gains of up to 40% from the Kryo 260 cores in the Snapdragon 636 compared to the ARM Cortex-A53 cores found in the Snapdragon 630, and the switch to Kryo brings the new Snapdragon 636 closer to the specs of the Snapdragon 660 - also an 8-core Kryo 260 design (though the higher-numbered platform does boast slightly higher clocks from its eight CPU cores at 2.2 GHz vs. 1.8 GHz from the 636).
The Snapdragon 636 also features the same X12 LTE modem found in the existing Snapdragon 630/660, which is capable of up to 600 Mbps download speeds (3 x 20 Hz carrier aggregation, 256-QAM) and 150 Mbps peak upload (2 x 20 Hz aggregation, 64-QAM).
Graphics duties are performed by the Adreno 509, and 18:9 FHD+ displays are supported. The Snapdragon 636 also includes the Hexagon 680 DSP (which we first saw in the Snapdragon 820) with Spectra 160 ISP for supported image capture "of up to 24 megapixels with zero shutter lag while supporting smooth zoom, fast autofocus and true-to-life colors for outstanding image quality", according to Qualcomm.
This new Snapdragon 636 also offers Qualcomm's Aqstic codec (another feature inherited from the 800-series) for high-resolution audio up to 24-bit/192 kHz PCM, along with dual-oscillator support (separate clock generators for 44.1 kHz and 48 kHz based sample rates!) and a 130dB dynamic range with a very low THD+N of -109dB.
To expand on what the Aqstic codec in the SD636 provides, the separate clock generators are a fascinating addition in a world where many codecs resample the common 44.1 kHz - pretty much all digital music at or below CD quality - to 48 kHz during playback. Having a proper 44.1 kHz clock means native playback without the interpolation and subsequent filtering required when altering the original signal to an incompatible sample rate.
The Snapdragon 636 - which is both "pin and software-compatible" with existing Snapdragon 660 and 630 mobile platforms, according to Qualcomm - is expected to ship to customers beginning in November.