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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 264 and the actual shader performance of the GeForce GT 420M is 192. The Radeon HD 6650M having 72 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.
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|Recommended RAM||4 GB||vs||4 GB|
|Recommended Screen Size||1366x768||1366x768|
|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 GFX based on the 2010 Fermi architecture. |
It's based on the Fermi GF108 Core and offers 96 Shader Processing Units, 16 TMUs and 4 ROPs on a 128-bit memory interface of 512MB DDR3. The central clock runs at 500MHz and the memory clock operates at 800MHz. Expect a power consumption of up to 23 Watts.
GeForce GT 420M's performance is average and so expect to only be able to play some modern demanding games at medium settings but with very frame rates (30+) using a 720p resolution.