![]() #17 min, max, avg, median took s +0.011s. #16 No cached benchmark found, getting uncached values +0s. #15 No cached benchmark found, getting uncached values +0.003s. #12 getting avg benchmarks for device 7062 +0s. #10 getting avg benchmarks for device 8778 +0s. #8 getting avg benchmarks for device 5960 +0s. ![]() #4 did not recreate cache, as it is less than 5 days old! Created at Sun, 16:22:51 +0100 +0s. GFXBench T-Rex HD Offscreen C24Z16 + PowerVR GX6450 On the other hand, the GPU has a comparatively "wide" architecture requirering a lot of transistors and die size (19 mm² in 20 nm). Thanks to the advanced 20-nanometer process and the relatively low clock rate, the GX6450 implementation in Apple's A8 offers a very high energy efficiency. Except for Nvidia's power hungry tablet chip Tegra K1 and its bigger cousin GX6650, the GX6450 is one of the fastest mobile GPUs in late 2014. Even the most advanced games and high resolution displays are handled without any problems. Among others, the GPU supports OpenGL 3.x/4.x, OpenGL ES 3.0 as well as DirectX 10. Compared to other mobile graphics solutions, the GX6450 outperforms the Qualcomm Adreno 330 ( Snapdragon 800/ 801) and matches the more recent Adreno 420 ( Snapdragon 805). In the iPhone 6, the GPU should be clocked at around 450 MHz, delivering about 115 GLOPS (FP32). Thanks to additional dedicated FP16-ALUs, however, the also important FP16 (half precision) performance has been greatly improved. ![]() Therefore, the theoretical FP32 (full precision) compute performance per clock is identical to the previous G6430 (also 4 clusters) found in the Apple A7. The GPU is based on the PowerVR Series 6XT (Rogue) Unified Shader architecture and integrates four clusters with two TMUs and 32 FP32-ALUs each. ![]() The chip is available since Q3/2014 and of one of the fastest solutions in its class at the time of introduction. The Imagination Technologies PowerVR GX6450 is a fast mobile graphics solution for smartphones and tablets, which can be found in ARM SoCs such as the Apple A8 ( iPhone 6 and iPhone 6 Plus). ![]()
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