Results: CPU Core Benchmarks
AnTuTu is an Android system benchmark designed to test the performance capabilities of four major aspects of mobile devices: Graphics (encompassing 2D, UI and basic 3D), CPU (fixed, floating-point and threading), RAM (read and write), and I/O (read and write).
The Shield Tablet easily outscores the other devices in this system benchmark thanks to its Kepler GPU, which is more than twice as fast as Qualcomm's latest Adreno 420 GPU in the Snapdragon 805 SoC! Kepler’s advantage is specific to the 3D graphics sub-test though, with the Adreno 420 equaling its 2D score.
All three -A15-based SoCs outscore Snapdragon’s Krait architecture in the CPU test. The higher-clocked, newer revision -A15 cores in Tegra K1 show a 23% advantage over Samsung’s Exynos 5 Octa.
Snapdragon 805’s 25.6GB/s of memory bandwidth give it the highest score in the RAM test, while the Shield Tablet places second with its 14.9GB/s.
Basemark OS II Full (Anti-Detection)
Basemark OS II is an all-in-one tool designed for measuring overall performance of mobile devices. It scores each device in four main categories: System, Memory, Graphics and Web. The System score reflects CPU and memory performance, specifically testing integer and floating-point math, along with single- and multi-core CPU image processing using a 2048x2048-pixel, 32-bit image. Measuring the transfer rate of the internal NAND storage (Memory) is done by reading and writing files with a fixed size, files varying from 65KB to 16MB, and files in a fragmented memory scenario. Calculating the Graphics score involves mixing 2D/3D graphics inside the same scene, applying several pixel shader effects, and displaying 100 particles with a single draw call to test GPU vertex operations. The benchmark is rendered at 1920x1080 off-screen 100 times before being displayed on-screen. Finally, the Web score stresses the CPU by performing 3D transformations and object resizing with CSS, and also includes an HTML5 Canvas particle physics test.
Another impressive performance for Tegra K1 with a 2.5x advantage over Snapdragon 805 in the Graphics test. It’s also six times faster than the PowerVR G6430 GPU in the iPad Air and 22x faster than the feeble GeForce ULP GPU in the Tegra 4.
Apple’s A7 remains unbeaten in the CPU-centric System and Web tests.
Geekbench 3 Pro (Anti-Detection)
Primate Labs' Geekbench offers a wide selection of cross-platform compatibility, with apps available for Windows, OS X, Linux, iOS and Android. This simple system benchmark produces two sets of scores: single- and multi-threaded. For each, it runs a series of tests in three categories: Integer, Floating Point and Memory. The individual results are used to calculate category scores, which, in turn, generate overall Geekbench scores.
The A7 in the iPad Air posts the highest scores, even though it operates at the lowest frequency. Its emphasis on execution width and larger caches proves to be the winning formula.
Snapdragon 805 falls behind Tegra K1 once again in CPU performance, with about a 13% deficit. Compared to the lower-clocked -A15 cores in the Exynos 5 Octa, the Tegra K1’s performance scales almost perfectly with clock speed.
With half as many CPU cores as its competitors, the A7 drops out of first place in the Multi-Core test, yielding the position to the Tegra K1.
Snapdragon 805 shows off its superior memory bandwidth. However, its Integer and Floating Point scores are lower than the Snapdragon 800 in the Galaxy Note 10.1 LTE, which itself is about 23% slower than the Shield Tablet in the same tests.
Principled Technologies' MobileXPRT 2013 is a modern SoC benchmark for Android. It consists of 10 real-world test scenarios split into two categories: Performance and User Experience.
The Performance suite contains five tests: Apply Photo Effects, Create Photo Collages, Create Slideshow, Encrypt Personal Content and Detect Faces to Organize Photos. Performance results are measured in seconds. The User Experience suite also has five tests: List Scroll, Grid Scroll, Gallery Scroll, Browser Scroll and Zoom and Pinch. These results are measured in frames per second. The category scores are generated by taking a geometric mean of the ratio between a calibrated machine (Motorola's Droid Razr M) and the test device for each subtest.
Despite its 16% clock rate advantage, the Tegra K1 posts essentially the same scores as the Exynos 5 Octa in every test. These benchmark results don’t align with either CPU frequency or memory bandwidth and are difficult to explain.
The unit of measure for the User Experience Tests is frames per second. Values for each individual test are shown within the bar graph. The number to the right of each bar is the computed score; higher is better.
The Shield Tablet is pretty much limited by v-sync in every test except Gallery Scroll. All of the devices are within 10% of each other and provide acceptable frame rates.