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AMD Radeon HD 6640G2 vs AMD Radeon HD 6680G2 vs AMD Radeon HD 6775G2

AMD Radeon HD 6640G2

► remove from comparison AMD Radeon HD 6640G2

The AMD Radeon HD 6640G2 is the combination of a integrated AMD Radeon HD 6620G APU processor graphics card and a dedicated entry level AMD Radeon HD 6470M graphics card in CrossFire combination. It is called AMD Dual Graphics or asymmetric CrossFire and uses AFR (Alternate Frame Rendering) to render different frames on the two graphic cores. Therefore the combination also suffers from micro stuttering (different spaces between two images lead to stuttering altough the framerate is high enough for fluent gaming with only one GPU).

The performance of the Radeon HD 6640G2 depends greatly on the driver support for the used games. In some games the performance may even degrade by 10-15% compared to using only the APU graphics card. Currently (June 2011) only DirectX 10 and 11 graphics modes are supported and therefore lower settings and older games are not accelerated. Due to the micro stuttering and performance problems, Dual Graphics may impose more problems than bring performance gains.

The features like PureVideo HD (UVD3) or OpenCL support are similar to the two graphics cards.

As both graphics cards are rendering frames, the power consumption is clearly higher than using only one GPU.

AMD Radeon HD 6680G2

► remove from comparison AMD Radeon HD 6680G2

The AMD Radeon HD 6680G2 is the combination of a integrated AMD Radeon HD 6520G APU processor graphics card and a dedicated entry level AMD Radeon HD 6630M graphics card in CrossFire combination. It is called AMD Dual Graphics or asymmetric CrossFire and uses AFR (Alternate Frame Rendering) to render different frames on the two graphic cores. Therefore the combination also suffers from micro stuttering (different spaces between two images lead to stuttering altough the framerate is high enough for fluent gaming with only one GPU).

The performance of the Radeon HD 6680G2 depends greatly on the driver support for the used games. In some games the performance may even degrade by 10-15% compared to using only the APU graphics card. Currently (June 2011) only DirectX 10 and 11 graphics modes are supported and therefore lower settings and older games are not accelerated. Due to the micro stuttering and performance problems, Dual Graphics may impose more problems than bring performance gains.

The features like PureVideo HD (UVD3) or OpenCL support are similar to the two graphics cards.

As both graphics cards are rendering frames, the power consumption is clearly higher than using only one GPU.

AMD Radeon HD 6775G2

► remove from comparison AMD Radeon HD 6775G2

The AMD Radeon HD 6775G2 is the combination of a integrated AMD Radeon HD 6620G or 6520G APU processor graphics card and a dedicated entry level AMD Radeon HD 6770M graphics card in CrossFire combination. The laptop must be equipped with dual channel RAM for CrossFire to work.

This particular graphics solution is called AMD Dual Graphics or asymmetric CrossFire and uses AFR (Alternate Frame Rendering) to render different frames on the two graphic cores. As a result, the combination suffers from micro stuttering, a phenomenon where frame rates may appear consistently high but with noticeable stutters.

The performance of the Radeon HD 6775G2 depends greatly on driver support from games. In some games, the performance may even degrade by 10-15% compared to using only the APU graphics card. As of June 2011, only DirectX 10 and 11 graphics modes are supported while lower settings and older games cannot be accelerated. Due to micro stuttering and performance problems, AMD Dual Graphics may impose more graphical problems than gains.

Features like PureVideo HD (UVD3) and OpenCL support are available on the Radeon HD 6775G2 for accelerated video encoding.

As both graphics cards are rendering frames, the power consumption is clearly higher than just one active GPU.

AMD Radeon HD 6640G2AMD Radeon HD 6680G2AMD Radeon HD 6775G2
Radeon HD 6000G2 Series
Radeon HD 6775G2 880
Radeon HD 6755G2 880
Radeon HD 6760G2 880
Radeon HD 6740G2 880
Radeon HD 6720G2 880
Radeon HD 6690G2 880
Radeon HD 6680G2 800
Radeon HD 6645G2 560
Radeon HD 6640G2 560
Radeon HD 6545G2 480
Radeon HD 6540G2 480
Radeon HD 6515G2 400
Radeon HD 6510G2 400
Radeon HD 6775G2 880
Radeon HD 6755G2 880
Radeon HD 6760G2 880
Radeon HD 6740G2 880
Radeon HD 6720G2 880
Radeon HD 6690G2 880
Radeon HD 6680G2 800
Radeon HD 6645G2 560
Radeon HD 6640G2 560
Radeon HD 6545G2 480
Radeon HD 6540G2 480
Radeon HD 6515G2 400
Radeon HD 6510G2 400
Radeon HD 6775G2 880
Radeon HD 6755G2 880
Radeon HD 6760G2 880
Radeon HD 6740G2 880
Radeon HD 6720G2 880
Radeon HD 6690G2 880
Radeon HD 6680G2 800
Radeon HD 6645G2 560
Radeon HD 6640G2 560
Radeon HD 6545G2 480
Radeon HD 6540G2 480
Radeon HD 6515G2 400
Radeon HD 6510G2 400
ArchitectureTerascale 2Terascale 2Terascale 2
Pipelines560 - unified800 - unified880 - unified
Shared Memorynonono
APIDirectX 11, Shader 5.0DirectX 11, Shader 5.0DirectX 11, Shader 5.0
technology40 nm40 nm40 nm
Notebook Sizemedium sizedmedium sizedmedium sized
Date of Announcement14.06.2011 14.06.2011 14.06.2011

Benchmarks

3DMark 11 - 3DM11 Performance Score
1105 Points (2%)
3DMark 11 - 3DM11 Performance GPU
1061 Points (1%)
3DMark Vantage
3DM Vant. Perf. total + AMD Radeon HD 6680G2
3DMark Vantage - 3DM Vant. Perf. total
3224 Points (1%)
3DM Vant. Perf. GPU no PhysX + AMD Radeon HD 6680G2
3DMark Vantage - 3DM Vant. Perf. GPU no PhysX
2800 Points (2%)
3DMark 06 3DMark 06 - Standard 1280x1024 + AMD Radeon HD 6680G2
3DMark 06
4795 Points (7%)
Unigine Heaven 2.1 - Heaven 2.1 high
10.8 fps (2%)
Windows 7 Experience Index - Win7 Gaming graphics
6.5 Points (82%)
Windows 7 Experience Index - Win7 Graphics
5.9 Points (75%)
Cinebench R10 Cinebench R10 Shading (32bit) + AMD Radeon HD 6680G2
Cinebench R10 - Cinebench R10 Shading (32bit)
3884 Points (3%)
Cinebench R11.5 Cinebench R11.5 OpenGL 64 Bit + AMD Radeon HD 6680G2
Cinebench R11.5 - Cinebench R11.5 OpenGL 64 Bit
20.3 fps (7%)

Average Benchmarks AMD Radeon HD 6680G2 → NAN% n=

- 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.

low 1024x768
Radeon HD 6680G2:
51 fps  fps
high 1366x768
Radeon HD 6680G2:
27.8 fps  fps
Dirt 3

Dirt 3

2011
low 800x600
Radeon HD 6680G2:
64.9  fps
med. 1024x768
Radeon HD 6680G2:
57.6  fps
high 1360x768
Radeon HD 6680G2:
23.7  fps
Total War: Shogun 2

Total War: Shogun 2

2011
low 1024x768
Radeon HD 6680G2:
88.5  fps
med. 1280x720
Radeon HD 6680G2:
30.5  fps
low 800x600
Radeon HD 6680G2:
46 fps  fps
med. 1024x768
Radeon HD 6680G2:
31.7 fps  fps
high 1360x768
Radeon HD 6680G2:
25.2 fps  fps
low 1024x768
Radeon HD 6680G2:
95 fps  fps
med. 1360x768
Radeon HD 6680G2:
28.8 fps  fps
high 1360x768
Radeon HD 6680G2:
20 fps  fps
low 1024x768
Radeon HD 6680G2:
55 fps  fps
med. 1366x768
Radeon HD 6680G2:
44.4 fps  fps
high 1366x768
Radeon HD 6680G2:
33.1 fps  fps
low 800x600
Radeon HD 6680G2:
94 fps  fps
med. 1024x768
Radeon HD 6680G2:
33.6 fps  fps
high 1366x768
Radeon HD 6680G2:
28.2 fps  fps
Risen

Risen

2009
low 800x600
Radeon HD 6680G2:
43 fps  fps
med. 1024x768
Radeon HD 6680G2:
24.6 fps  fps
high 1366x768
Radeon HD 6680G2:
16.6 fps  fps

For more games that might be playable and a list of all games and graphics cards visit our Gaming List

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Redaktion, 2017-09- 8 (Update: 2017-09-11)