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PowerVR GX6450

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).

ManufacturerImagination
PowerVR Series 6XT (Rogue) Series
PowerVR GXA6850 256 @ 450 (?) MHz128 Bit
PowerVR GX6450 128 @ 450 (?) MHz64 Bit
PowerVR GX6250 64 @ 700 (Boost) MHz64 Bit
CodenameRogue
ArchitecturePowerVR Rogue
Pipelines128 - unified
Core Speed *450 (?) MHz
Memory Bus Width64 Bit
Shared Memoryno
DirectXDirectX 10
technology20 nm
FeaturesOpenGL 3.x, 4.x, OpenGL ES 3.0
Date of Announcement09.09.2014
Link to Manufacturer Pagehttp://www.imgtec.com/powervr/series6xt....
* The specified clock rates are only guidelines for the manufacturer and can be altered by them.
CPUGPU Base SpeedGPU Boost / Turbo
Apple A82 x 1400 MHz? MHz? MHz
min. - max.? - ? MHz? - ? MHz

Benchmarks

GFXBench 3.0 - Manhattan Offscreen OGL off screen
0%
100%
min: 17.8     avg: 19.1 (4%)     median: 18.5 (3%)     max: 21.5 fps
GFXBench 3.0 - Manhattan Onscreen OGL on screen
0%
100%
min: 15.3     avg: 23.7 (7%)     median: 24.5 (7%)     max: 30.6 fps
Basemark X 1.1 - High Quality
0%
100%
min: 15572     avg: 16055 (36%)     median: 16055 (36%)     max: 16538 fps
GFXBench (DX / GLBenchmark) 2.7
T-Rex HD Offscreen C24Z16 1920x1080 +
T-Rex HD Onscreen C24Z16 +
3DMark - Ice Storm Unlimited Graphics Score 1280x720 offscreen
0%
100%
min: 22509     avg: 23756.2 (5%)     median: 23937 (5%)     max: 25254 Points
PassMark PerformanceTest Mobile V1 - 3D Graphics Tests
0%
100%
min: 1060     avg: 1678.7 (49%)     median: 1984 (58%)     max: 1992 Points
PassMark PerformanceTest Mobile V1 - 2D Graphics Tests
0%
100%
min: 2320     avg: 2579.3 (25%)     median: 2609 (25%)     max: 2809 Points
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card

For more games that might be playable and a list of all games and graphics cards visit our Gaming List
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Notebook reviews with PowerVR GX6450 graphics card

Apple iPad Mini 4: Apple A8, 7.9", 0.3 kg
  Review » Apple iPad Mini 4 First Impressions

  Review » Apple iPad Mini 4 Tablet Review

Apple iPhone 6: Apple A8, 4.7", 0.1 kg
  Review » Apple iPhone 6 Smartphone Review

Apple iPhone 6 Plus: Apple A8, 5.5", 0.2 kg
  Review » Apple iPhone 6 Plus Smartphone Review

Apple iPad Mini 4: Apple A8, 7.9", 0.3 kg
  External Review » Apple iPad Mini 4

Apple iPhone 6: Apple A8, 4.7", 0.1 kg
  External Review » Apple iPhone 6

Apple iPhone 6 Plus: Apple A8, 5.5", 0.2 kg
  External Review » Apple iPhone 6 Plus

» 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.

Class 1
Class 2
GeForce GTX 580
Radeon HD 6970
GeForce GTX 570
GeForce GTX 560 Ti
Radeon HD 5850
Radeon HD 7770
Radeon HD 7770
GeForce GTX 460 768MB
Radeon HD 6790
Radeon HD 5770
GeForce GTX 550 Ti
Radeon HD 4850
Class 3
GeForce GTS 450
Radeon HD 5670
GeForce GT 240
GeForce GT 430
Class 4
Radeon HD 5570
GeForce GT 220
Radeon HD 6450 GDDR5
Class 5
Radeon HD 4350
GeForce G 107M *
Chrome9HD *
Class 6
unknown *

* Approximate position of the graphics adapter

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> Notebook / Laptop Reviews and News > Benchmarks / Tech > Comparison of Laptop Graphics Cards > Imagination PowerVR GX6450
Klaus Hinum (Update: 2016-01-26)