The Imagination Technologies PowerVR GXA6850 is a fast mobile graphics solution (mainly) for tablets, which can be found in ARM SoCs such as the Apple A8X (iPad Air 2). The chip is available since Q3/2014 and of one of the fastest solutions in its class at the time of introduction.
Architecture and Performance
In contrast to previous speculations, the A8X integrates an 8-cluster PowerVR Series 6 (Rogue) GXA6850 consisting of two GX6450 GPUs (2x 4 clusters) instead of a single GX6650 (6 clusters). The name GXA6850 has been created by Anandtech, the design may also be called a GX6450MP2.
Each cluster offers four FP16 and two FP32 ALUs, leading to a compute power of about 230 GFLOPS FP32 at 450 MHz (clock rate estimated). The GXA6850 does not only beat the Qualcomm Adreno 420 (Snapdragon 805), but also the Nvidia Tegra K1 by a small margin. Thus, the GXA6850 is one of the fastest tablet GPUs as of 2014 and can handle even the most demanding mobile games in high resolutions. Among others, the GPU supports OpenGL 3.x/4.x, OpenGL ES 3.0 as well as DirectX 10.
Power Consumption
Thanks to the advanced 20-nanometer process and the relatively low clock rate, the GXA6850 implementation in Apple's A8X offers a very high energy efficiency. On the other hand, the GPU has a comparatively "wide" architecture requirering a lot of transistors and die size (about 38 mm² in 20 nm).
PowerVR Series 6XT (Rogue) Series
| ||||||||||
| Codename | Rogue | |||||||||
| Architecture | PowerVR Rogue | |||||||||
| Pipelines | 256 - unified | |||||||||
| Core Speed | 450 (?) MHz | |||||||||
| Memory Bus Width | 128 Bit | |||||||||
| Shared Memory | no | |||||||||
| API | DirectX 10, OpenGL 3.x, 4.x, OpenGL ES 3.0 | |||||||||
| technology | 20 nm | |||||||||
| Features | OpenGL 3.x, 4.x, OpenGL ES 3.0 | |||||||||
| Date of Announcement | 09.09.2014 | |||||||||
| Link to Manufacturer Page | www.imgtec.com | |||||||||
- Average benchmark values for this graphics cardFor more games that might be playable and a list of all games and graphics cards visit our Gaming List
Apple iPad Air 2 2014: Apple A8X, 9.70", 0.4 kg
External Review » Apple iPad Air 2
» Comparison of GPUs
Detailed list of all laptop GPUs sorted by class and performance.
» Benchmark List
Sort and restrict laptop GPUs based on performance in synthetic benchmarks.
» Notebook Gaming List
Playable games for each graphics card and their average FPS results.
Top 10 Laptops
Multimedia, Budget Multimedia, Gaming, Budget Gaming, Lightweight Gaming, Business, Budget Office, Workstation, Subnotebooks, Ultrabooks, Chromebooks
under 300 USD/Euros, under 500 USD/Euros, 1,000 USD/Euros, for University Students, Best Displays
Top 10 Smartphones
Smartphones, Phablets, ≤6-inch, Camera Smartphones
