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AMD Radeon HD 6640G2

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.

Radeon HD 6000G2 Series

Radeon HD 6775G2 compare 880
Radeon HD 6755G2 compare 880
Radeon HD 6760G2 compare 880
Radeon HD 6740G2 compare 880
Radeon HD 6720G2 compare 880
Radeon HD 6690G2 compare 880
Radeon HD 6680G2 compare 800
Radeon HD 6645G2 compare 560
Radeon HD 6640G2 560
Radeon HD 6545G2 compare 480
Radeon HD 6540G2 compare 480
Radeon HD 6515G2 compare 400
Radeon HD 6510G2 compare 400
ArchitectureTerascale 2
Pipelines560 - unified
Shared Memoryno
APIDirectX 11, Shader 5.0
technology40 nm
Notebook Sizemedium sized
Date of Announcement14.06.2011


- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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 AMD Radeon HD 6640G2 graphics card

Samsung 305E7A-S04DE: AMD A8-3520M, 17.30", 2.7 kg
  External Review » Samsung 305E7A-S04DE

Toshiba Satellite L750D-17Q: AMD A8-3500M, 15.60", 2.5 kg
  External Review » Toshiba Satellite L750D-17Q

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» Notebook Gaming List
Playable games for each graphics card and their average FPS results.

Class 1

Class 2

M3 Max 40-Core GPU *
M3 Pro 18-Core GPU *
Radeon PRO W6600M *

Class 3

UHD Graphics 750

Class 4

Class 5

* Approximate position of the graphics adapter

> Notebook / Laptop Reviews and News > Benchmarks / Tech > Comparison of Laptop Graphics Cards > AMD Radeon HD 6640G2
Klaus Hinum (Update: 2017-09- 5)