NVIDIA GeForce GT 420M
The NVIDIA GeForce GT 420M 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 GT 415M, the card features the full 96 shader cores. Compared to the GT425M and GT435M, the 420M offers lower clock rates.
The GF108 core of the GT 420M 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 420M 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 420M. In our tests with an Acer Aspire 5745PG pre-sample, the GT 420M performed on average between a GeForce GT 330M and GT 335M. Due to the higher shader count of the GT 420M, the performance could improve with future driver releases.
The gaming performance of the GT 420M 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 5650, the GT 420M can transfer Dolby True HD and DTS-HD bitstream-wise without quality loss to a HiFi receiver.
The GT420M 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 420M 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 rumors, the power consumption of the GeForce GT 420M should be about 35 Watt (TDP including the MXM board and memory), and therefore suited for 15” laptops. Our Aspire 5745PG review unit was equipped with Optimus and the GT 420M needed 10.7-12.3 Watt more than the GMA HD alone in idle mode, 15.6-17.5 Watt during 3DMark06 and 23.2 Watt more during Furmark.
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
|Pipelines||96 - unified|
|Core Speed||500 MHz|
|Shader Speed||1000 MHz|
|Memory Speed||800 MHz|
|Memory Bus Width||128 Bit|
|API||DirectX 11, Shader 5.0|
|Notebook Size||medium sized|
|Date of Announcement||03.09.2010|
Optimus Support, PureVideo HD VP4, Blu-Ray 3D, Bitstream HD Audio, CUDA, DirectCompute, OpenCL, OpenGL 4.0, DirectX 11
|Link to Manufacturer Page||http://www.nvidia.com/object/product-gef...|