NVIDIA GeForce GT 520M vs NVIDIA GeForce GT 540M

NVIDIA GeForce GT 520M

The NVIDIA GeForce GT 520M is an entry level dedicated laptop graphics card presented in 2010. It is based on the GF119 or GF108 core, which are both related to the Fermi architecture. Depending on the version, it features a 64 Bit memory bus and higher clock rates (GF119 version) or a 128 Bit memory bus and slower clock rates. Theoretically, the card also supports fast GDDR5 memory, but due to cost limitations, DDR3 will be used by the laptop manufacturers.

Compared to the GT 420M, the 520M offers only 48 instead of 96 shader cores. 

• GF108 - core 600/1200 MHz, 128 Bit 900 MHz DDR3
• GF119 - core 740/1480 MHz, 64 Bit 800 MHz DDR3

Architecture

The GF119 offers 48 ALUs, 8 texture units and a 64 Bit memory interface for DDR3-VRAM. Therefore, it is similar to a half GF108 (GeForce GT 540M) but already manufactured with optimized transistors. As a difference the amount of raster-operation-processors (ROP) stayed the same counting 4. The GF119 is the smalles chip of the Fermi generation and is used for low end laptops.

Performance

Through CUDA, OpenCL, and DirectCompute 2.1 support, the GeForce GT 520M 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 theoretically done by the GPU using PhysX (e.g. supported by Mafia 2 or Metro 2033) but the performance wont be sufficient for this.

The power consumption of approximately 17 Watt (including board and memory) allows the usage of the 520M in small laptops. Furthermore, Optimus is supported (if implemented by the manufacturer) for automatic switching to the processor graphics card to save power.

NVIDIA GeForce GT 540M

The NVIDIA GeForce GT 540M is a fast middle class graphics card for laptops. It is based on the same chip as the GeForce GT 435M but with slightly higher clock speeds. Furthermore, it supports GDDR5 and 900MHz DDR3 graphics memory. Unfortunately, no models have utilized GDDR5 due to the increase in power consumption and higher prices compared to DDR3 VRAM.

GF108 Architecture

The GT 540M is based on the same GF108 architecture as the older GT 435M. The GF108 stems from the GF100 (Fermi) DirectX 10 architecture. However, it is optimized for the consumer end (gaming) and stripped down to save power. More information on the architecture can be found on our GeForce GT 435M page.

Performance

In general, the performance of the 540M lies between the Radeon HD 5650 and 5730 in our first benchmark tests. Therefore, the 540M is about 10% faster than the GT 435M using DDR3 graphics memory.

Paired with a fast CPU, demanding games of 2010 should run fluently in medium to high details and SXGA (1280x1024) resolution. In our tests, for example, Call of Duty: Black Ops and StarCraft 2 ran fluently in high details and 1360x768. More gaming benchmarks can be found below. Demanding games released in 2011 like Anno 2070 or Skyrim will only run fluent in low to medium detail settings.

Features

A novelty of the GF104/106/108 chips is the support for Bitstream HD Audio (Blu-Ray) output via HDMI. Alike the Radeon HD 5730, the GT 540M can transfer Dolby True HD and DTS-HD bitstream without quality loss to a HiFi receiver.

The GT 540M offers PureVideo HD technology for video decoding using the GPU. The integrated 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 540M can be of help in general calculations. For example, the stream processor can  encode videos considerably faster than can a modern CPU. Furthermore, physics calculations can be done by the GPU using PhysX (supported by Mafia 2 and Metro 2033). However, the GPU is not fast enough to calculate PhysX high detail game settings.

Following the current 3D trend, the 540M supports 3D Vision.  It enables the laptop to send 3D content (3D games, 3D Web Streaming, 3D photos, 3D Blu-Rays) to a built-in 3D-enabled screen or an external 3D TV if supported by the manufacturer. This feature is disabled if the notebook includes Optimus.

The power consumption of the GeForce GT 540M should be similar to the GeForce GT 435M or Radeon HD 5730 and is therefore suited for 15" or larger laptops. Without load, the chip is clocked approximately at 50/101/137 MHz (chip/shader/memory) in 2D mode and 202/405/324 in 3D mode to save power. Furthermore, the 500M series supports Optimus to automatically switch between the integrated graphics card from Intel and the Nvidia GPU. The implementation of the Nvidia graphics switching technology is dependent on the laptop manufacturer.