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PowerVR GXA6850 vs PowerVR GX6450

PowerVR GXA6850

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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 GX6450

► remove from comparison Imagination PowerVR GX6450

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). 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

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. Therefore, the theoretical FP32 (full precision) compute performance per clock is identical to the previous G6430 (also 4 clusters) found in the Apple A7. Thanks to additional dedicated FP16-ALUs, however, the also important FP16 (half precision) performance has been greatly improved.

In the iPhone 6, the GPU should be clocked at around 450 MHz, delivering about 115 GLOPS (FP32). 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). 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.

Power Consumption

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. On the other hand, the GPU has a comparatively "wide" architecture requirering a lot of transistors and die size (19 mm² in 20 nm).

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PowerVR GXA6850PowerVR GX6450
PowerVR Series 6XT (Rogue) Series
PowerVR GXA6850 256 @ 0.45 GHz128 Bit
PowerVR GX6450 128 @ 0.45 GHz64 Bit
PowerVR GX6250 compare 64 @ 0.7 GHz64 Bit
PowerVR GXA6850 256 @ 0.45 GHz128 Bit
PowerVR GX6450 128 @ 0.45 GHz64 Bit
PowerVR GX6250 compare 64 @ 0.7 GHz64 Bit
CodenameRogueRogue
ArchitecturePowerVR RoguePowerVR Rogue
Pipelines256 - unified128 - unified
Core Speed450 (?) MHz450 (?) MHz
Memory Bus Width128 Bit64 Bit
Shared Memorynono
APIDirectX 10, OpenGL 3.x, 4.x, OpenGL ES 3.0DirectX 10, OpenGL 3.x, 4.x, OpenGL ES 3.0
technology20 nm20 nm
FeaturesOpenGL 3.x, 4.x, OpenGL ES 3.0OpenGL 3.x, 4.x, OpenGL ES 3.0
Date of Announcement09.09.2014 09.09.2014
Link to Manufacturer Pagewww.imgtec.comwww.imgtec.com
CPU in PowerVR GX6450GPU Base SpeedGPU Boost / Turbo
Apple A82 x 1400 MHz? MHz? MHz

Benchmarks

3DMark - 3DMark Ice Storm Unlimited Graphics
31542 Points (4%)
min: 22509     avg: 23756     median: 23937 (3%)     max: 25254 Points
3DMark - 3DMark Sling Shot (ES 3.0) Unlimited
2651 Points (12%)
3DMark - 3DMark Sling Shot (ES 3.0) Unlimited Graphics
3474 Points (8%)
3DMark - 3DMark Sling Shot Extreme (ES 3.1) Unlimited
2059 Points (10%)
3DMark - 3DMark Sling Shot Extreme (ES 3.1) Unlimited Graphics
2377 Points (7%)
GFXBench - GFXBench 5.0 Aztec Ruins High Tier Offscreen
5.3 fps (1%)
GFXBench - GFXBench 5.0 Aztec Ruins Normal Tier Offscreen
14.2 fps (1%)
6.6 fps (0%)
GFXBench 3.1 - GFXBench Manhattan ES 3.1 Offscreen
17.9 fps (0%)
GFXBench 3.0 - GFXBench 3.0 Manhattan Offscreen
min: 32.4     avg: 35     median: 35 (2%)     max: 37.6 fps
min: 17.8     avg: 19.1     median: 18.5 (1%)     max: 21.5 fps
GFXBench (DX / GLBenchmark) 2.7
GFXBench T-Rex HD Offscreen C24Z16 + PowerVR GXA6850
GFXBench (DX / GLBenchmark) 2.7 - GFXBench T-Rex HD Offscreen C24Z16
min: 70.4     avg: 70.4     median: 70.4 (1%)     max: 70.5 fps
GFXBench T-Rex HD Offscreen C24Z16 + PowerVR GX6450
min: 42.6     avg: 44.6     median: 44.8 (0%)     max: 47.8 fps
Basemark X 1.1 - Basemark X 1.1 High Quality
29502 Points (67%)
min: 15572     avg: 16055     median: 16055 (36%)     max: 16538 Points
Basemark X 1.1 - Basemark X 1.1 Medium Quality
41488 Points (92%)
PassMark PerformanceTest Mobile V1 - PerformanceTest Mobile V1 2D Graphics Tests
2956 Points (3%)
min: 2320     avg: 2579     median: 2609 (3%)     max: 2809 Points
PassMark PerformanceTest Mobile V1 - PerformanceTest Mobile V1 3D Graphics Tests
1160 Points (2%)
min: 1060     avg: 1679     median: 1984 (3%)     max: 1992 Points

Average Benchmarks PowerVR GXA6850 → 100% n=7

Average Benchmarks PowerVR GX6450 → 79% n=7

- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

Game Benchmarks

The following benchmarks stem from our benchmarks of review laptops. The performance depends on the used graphics memory, clock rate, processor, system settings, drivers, and operating systems. So the results don't have to be representative for all laptops with this GPU. For detailed information on the benchmark results, click on the fps number.

League of Legends: Wild Rift

League of Legends: Wild Rift

2020
low
PowerVR GX6450:
59  fps
PowerVR GX6450lowmed.highultraQHD4K
League of Legends: Wild Rift59
< 30 fps
< 60 fps
< 120 fps
≥ 120 fps
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Redaktion, 2017-09- 8 (Update: 2023-07- 1)