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Gaming Performance Comparison
In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 6650M are noticeably better than the Nvidia GeForce GT 420M.
The Radeon HD 6650M has a 100 MHz higher core clock speed and 8 more Texture Mapping Units than the GeForce GT 420M. This results in the Radeon HD 6650M providing 6.4 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.
The Radeon HD 6650M has a 100 MHz higher core clock speed and 4 more Render Output Units than the GeForce GT 420M. This results in the Radeon HD 6650M providing 2.8 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.
The Radeon HD 6650M was released less than a year after the GeForce GT 420M, and so they are likely to have similar driver support for optimizing performance when running the latest games.
The Radeon HD 6650M has 512 MB more video memory than the GeForce GT 420M, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the Radeon HD 6650M also has superior memory performance overall.
The memory bandwidth of the Radeon HD 6650M and the GeForce GT 420M are the same, which means the Radeon HD 6650M and the GeForce GT 420M have equal limitations when it comes to graphical data transfer.
The Radeon HD 6650M has 480 Shader Processing Units and the GeForce GT 420M has 96. However, the actual shader performance of the Radeon HD 6650M is 144. The Radeon HD 6650M having 48 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon HD 6650M delivers a marginally smoother and more efficient experience when processing graphical data than the GeForce GT 420M.
The GeForce GT 420M requires 23 Watts to run but there is no entry for the Radeon HD 6650M.
|Mini Review||Radeon HD 6650M is a fast-middle-class GPU based on the 40nm Terrascale 2 architecture. |
It's based on the Turks Core (therefore related to Radeon HD 6670) and offers 480 Shader Processing Units, 24 TMUs and 8 ROPs on a 128-bit memory interface of standard DDR3. Its central clock runs at 600MHz and the memory clock operates at 800MHz.
Compared to Radeon HD 6730M, it's heavily underclocked and therefore performs significantly worse.
Using a 720p resolution, most of today's games are only playable at medium settings but with very fluent frame rates (40+).
GeForce GT 420M is a middle-class Mobile Graphics Card based on the first revision of the Fermi Architecture.
The Fermi Architecture is manufactured with a 40nm technology and uses a technique known as Hot Clocking: The Shaders are clocked twice as fast as the Central Unit. While this leads to a reasonable performance boost, it causes enormous amounts of energy dissipation, leading, ultimately, to a significantly higher operating temperature.
Fermi is also the first GPU architecture with fully cached memory access which increases memory performance.
It equips a GPU Codenamed N11P-GE-A1 which has 2 Stream Multiprocessors activated and thus offers 96 Shader Processing Units, 16 TMUs and 4 ROPs. The Central Unit is clocked at 500MHz.
The GPU accesses a 512MB frame buffer of DDR3, through a 128-bit memory interface. The size of the frame buffer is adequate. The Memory Clock Operates at 800MHz.
DirectX 11.0 Support (11.0 Hardware Default) and support for Optimus, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies
With a rated board TDP of 23W, it is suited for 15" or larger laptops.
Gaming benchmarks put its performance somewhat below a desktop GeForce GT 430.
We recommend a modest processor (Intel Core i3 Mobile) and 4GB of RAM for a system with GeForce GT 420M.