NVIDIA GeForce GT 425M

NVIDIA GeForce GT 425M

The NVIDIA GeForce GT 425M is a fast mid-range laptop graphics card presented in 2010. It is based on the GF108 core, which is related to the Fermi architecture. Therefore, it supports DirectX 11 and OpenGL 4.0. In contrast to the GTX 415M, the card features the full 96 shader cores. The difference of the GT420M, GT425M and GT435M is only the core and memory speed.

GF108 architecture

The GF108 core of the GT 425M is related to the GF100 core of the GeFore GTX 480M and offers 96 shaders and a 128 Bit memory bus for DDR3. Except for the memory controllers the GF108 can basically be considered a halved GF106. Therefore, the architecture is not comparable to the old GT215 (e.g., GeForce GTS 350M) or GT216 (e.g., GeForce GT 330M) cores. Unlike the GF100 the smaller GF104, GF106, and GF108 core were not only shortened, but also considerably modified. In contrast to the GF100, which was designed for professional applications, these chips target the consumer market. They feature more shaders (3x16 instead of 2x16), more texture units (8 instead of 4) and SFUs per streaming multi-processor (SM). As there are still only 2 warp schedulers (versus 3 shader groups), Nvidia now uses superscalar execution to use the higher amount of shaders per SM more efficiently. In theory, the shaders can thereby be utilized more efficiently and the performance per core is improved. However, in worst case scenarios the performance can also be worse than of the GF100 (and its predecessors). The ECC memory protection, which is important for professional applications, was completely omitted and the FP64 hardware shortened (only 1/3 of the shader are FP64-capable and therewith only 1/12 of the FP32’s performance). Because of these cutbacks, the size of the SM  grew only by 25% despite the higher number of shaders and larger warp schedulers with superscalar dispatch capabilities. Due to the different shader architectures and the higher clock rate of the shader domain, the core count can not be directly compared to AMD cores of the Radeon 5000 series (e.g. HD 5650).

Detailed information on the GF104 architecture (and therewith also the GF106 and GF108) can be found in the desktop GTX 460 article by Anandtech.


Because the GeForce GT 425M features a new architecture, the performance is not comparable to older chips with a similar core count. The DDR3 graphics memory combined with the 128 Bit bus should be the bottleneck of the GT 425M. In our tests with an Acer Aspire 5745PG pre-sample, a GT 420M performed on average between a GeForce GT 330M and GT 335M. Therefore, the GT 425 should be a bit faster than the GT 335M. Nvidia positions the card against the Mobility Radeon HD 5650.

The gaming performance of the GT 425M is sufficient for medium detail settings in modern games like Battlefield Bad Company 2. Less demanding games should run in high detail settings. The best resolution to choose is about 1360x768 due to the limited performance. Benchmarks and comparison charts on the 3D performance can be found below.


A novelty of the GF104/106/108 chips is the support of Bitstream HD Audio (Blu-Ray) output via HDMI. Alike the Radeon HD 5730, the GT 425M can transfer Dolby True HD and DTS-HD bitstream-wise without quality loss to a HiFi receiver.

The GT425M offers the PureVideo HD technology for video decoding. The included Video Processor 4 (VP4) supports feature set C and therefore the GPU is able to fully decode MPEG-1, MPEG-2, MPEG-4 Part 2 (MPEG-4 ASP - e.g., DivX or Xvid), VC-1/WMV9, and H.264 (VLD, IDCT, Motion Compensation, and Deblocking).

Furthermore, the GPU is able to decode two 1080p streams simultaneously (e.g. for Blu-Ray Picture-in-Picture).

Through CUDA, OpenCL, and DirectCompute 2.1 support the GeForce GT 425M can be of help in general calculations. For example, the stream processor can considerably faster encode videos than a fast CPU can. Furthermore, physics calculations can be done by the GPU using PhysX (e.g. supported by Mafia 2 or Metro 2033).

According to Nvidia, support for 3D Vision on the new graphics cards is also new. It enables the laptop to send 3D contents (3D games, 3D Web Streaming, 3D photos, 3D Blu-Rays) to a built-in 3D enabled screen or an external 3D TV (only if supported by the laptop manufacturer).

According to rumors, the power consumption of the GeForce GT 425M should be about 35 Watt (TDP including the MXM board and memory), and therefore suited for 15” laptops. Without load, the chip is clocked at 50/100/135 MHz (chip/shader/memory) in 2D respectively 200/400/325 in 3D mode to save power. Furthermore, the 400M series supports Optimus to automatically switch between the integrated graphics card from Intel and the Nvidia GPU. However, the laptop manufacturers need to implement it and it cannot be upgraded.

GeForce GT 400M Series
GeForce GT 445M compare 144 @ 0.59 GHz192 / 128 Bit @ 1250 MHz
GeForce GT 435M compare 96 @ 0.65 GHz128 Bit @ 800 MHz
GeForce GT 425M 96 @ 0.56 GHz128 Bit @ 800 MHz
GeForce GT 420M compare 96 @ 0.5 GHz128 Bit @ 800 MHz
GeForce GT 415M compare 48 @ 0.5 GHz128 Bit @ 800 MHz
Pipelines96 - unified
Core Speed560 MHz
Shader Speed1120 MHz
Memory Speed800 MHz
Memory Bus Width128 Bit
Memory TypeDDR3
Max. Amount of Memory1024 MB
Shared Memoryno
DirectXDirectX 11, Shader 5.0
technology40 nm
FeaturesOptimus Support, PureVideo HD VP4, 3D Vision, Bitstream HD Audio, CUDA, DirectCompute, OpenCL, OpenGL 4.0, DirectX 11
Notebook Sizemedium sized
Date of Announcement15.08.2010
Link to Manufacturer Page


3DMark Vantage
3DM Vant. Perf. total +
3DM Vant. Perf. GPU no PhysX +
3DMark 03 - 3DMark 03 - Standard
min: 15802     avg: 17132     median: 17344.5 (9%)     max: 17833 Points
3DMark 05 - 3DMark 05 - Standard
min: 11636     avg: 12975     median: 13104.5 (19%)     max: 13374 Points
3DMark 06 3DMark 06 - Score Unknown Settings +
3DMark 06 - Standard 1366x768 +
3DMark 06 - Standard 1280x1024 +
3DMark 06 - Standard 1280x800 +
3DMark 06 - Standard 1280x768 +
SPECviewperf 11
specvp11 snx-01 +
specvp11 tcvis-02 +
specvp11 sw-02 +
specvp11 proe-05 +
specvp11 maya-03 +
specvp11 lightwave-01 +
specvp11 ensight-04 +
specvp11 catia-03 +
Windows 7 Experience Index - Win7 Gaming graphics
min: 6.5     avg: 6.6     median: 6.6 (84%)     max: 6.6 Points
Windows 7 Experience Index - Win7 Graphics
min: 4.6     avg: 6     median: 6.5 (82%)     max: 6.6 Points
Cinebench R10 Cinebench R10 Shading (32bit) +
Cinebench R11.5 Cinebench R11.5 OpenGL 64 Bit +
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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.

Fifa 11

Fifa 11

low 800x600
214.2 319.9 fps 334 ~ 289 fps    + Compare
med. 1024x768
114 141.8 148.3 fps 161.8 fps ~ 141 fps    + Compare
high 1360x768
94.1 95.8 98 fps 104.1 fps ~ 98 fps    + Compare
ultra 1920x1080
51.3 57.6 fps ~ 54 fps    + Compare
» With all tested laptops playable in detail settings ultra.
Mafia 2

Mafia 2

low 800x600
50  fps    + Compare
med. 1024x768
29.6 33.4 39.2 ~ 34 fps    + Compare
high 1360x768
24.4 26.5 33.3 ~ 28 fps    + Compare
ultra 1920x1080
15.8 15.8 ~ 16 fps    + Compare
» With all tested laptops playable in detail settings low.
low 1024x768
151 fps 172.3 fps ~ 162 fps    + Compare
med. 1360x768
31.8 37.2 fps 37.8 fps 38.6 fps ~ 36 fps    + Compare
high 1360x768
25 26.3 fps 27 fps 28.1 fps ~ 27 fps    + Compare
ultra 1920x1080
13.7 15.5 fps ~ 15 fps    + Compare
» With most tested laptops playable in detail settings med..
low 800x600
40.6 40.7 fps 59.4 ~ 47 fps    + Compare
med. 1360x768
22 fps 22.7 fps 30.2 30.3 ~ 26 fps    + Compare
high 1600x900
11.2 fps 11.6 fps ~ 11 fps    + Compare
ultra 1920x1080
4.2 fps 5.7 ~ 5 fps    + Compare
» With all tested laptops playable in detail settings low.
low 1024x768
44.9 fps  fps    + Compare
med. 1366x768
30.6 fps 32.8 fps 35.9 ~ 33 fps    + Compare
high 1366x768
23.2 fps 24 fps 25.8 ~ 24 fps    + Compare
ultra 1920x1080
12.2 fps 12.9 ~ 13 fps    + Compare
» With all tested laptops playable in detail settings low.
low 800x600
106.2 fps  fps    + Compare
med. 1024x768
31 fps 39.2 fps 46.3 ~ 39 fps    + Compare
high 1366x768
26.3 fps 33.6 fps 38.4 ~ 33 fps    + Compare
ultra 1920x1080
17.9 fps 22.2 ~ 20 fps    + Compare