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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 158. The Radeon HD 6650M having 62 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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GPU Core Details

Core Speed600 MHzvs500 MHz
ArchitectureTerascale 2 Whistler LEFermi GF108
Notebook GPUyesyes
SLI/Crossfireyesvsno
Dedicatedyesvsyes
Release Date04 Jan 201103 Sep 2010
GPU LinkGD LinkGD Link
Approved
Comparison

GPU Memory

Memory1024 MBvs512 MB
Memory Speed800 MHzvs800 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth25.6GB/secvs25.6GB/sec
L2 Cache 256 KB green tick vs green tick 256 KB
Comparison

GPU Display

Shader Processing Units480vs96
Actual Shader Performance158vs96
Technology40nmvs40nm
Texture Mapping Units24vs16
Texture Rate14.4 GTexel/svs8 GTexel/s
Render Output Units8vs4
Pixel Rate4.8 GPixel/svs2 GPixel/s
Comparison

GPU Display Tech

DirectX11vs11
Shader Model5.0vs5.0
Open GL4.1vs4.0
Max Resolution (WxH)2560x1600vs2560x1600
VGA Connections1vs0
DVI Connections2vs1
HDMI Connections1vs1
Comparison

GPU Power Requirements

Max Power-23 Watts

GPU Supporting Hardware

Recommended RAM4 GBvs4 GB
Recommended Screen Size1366x7681366x768
Recommended PSU--

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon 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.
Recommended CPUIntel Core 2 Duo T5550 1.83GHz
Intel Celeron Dual-Core T1500
Intel Core 2 Duo T5670 1.8GHz
AMD Athlon 64 X2 Dual Core QL-62
Intel Core 2 Duo T7100 1.8GHz
AMD Phenom II X4 P920
Intel Pentium N3520 2.16GHz
Intel Core 2 Duo T9500 2.6GHz
Intel Core i3-330E 2.13GHz
Intel Core i3-M330 2.13GHz
Possible GPU UpgradesRadeon HD 6950M
GeForce GTX 670M 3GB
GeForce GTX 670M
Radeon HD 7870M
GeForce GT 755M
GeForce GT 755M
GeForce GTX 480M
GeForce GTX 660M
FirePro W4170M
Radeon HD 8850M 2GB GDDR5
GPU Variants--