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NVIDIA GeForce GT 640M LE

NVIDIA GeForce GT 640M LE

The NVIDIA GeForce GT 640M LE is a mid-range, DirectX 11.1 compatible graphics card that was announced in the first quarter of 2012 for thin-and-light-laptops. It is a Kepler-based GPU built on the GK107 architecture and is manufactured in 28nm at TSMC. The graphics card uses a 128-Bit wide memory interface with DDR3-VRAM. A slower core clock of only 500 MHz differs the LE-model from a normal GT 640MWatch out: Following rumors, there will also be a Fermi-based version (96 shaders, 762 MHz, DDR3/GDDR5, similar to 550M/555M) with a probably higher power consumption than the Kepler variant.

Architecture

The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 500M series. The GK107 Kepler core offers two shader blocks, called SMX, each with 192 shaders for a total of 384 shader cores that are clocked at the same speed as the processor core. Although more shader cores are available in the Kepler architecture as compared to the Fermi design, the Kepler shaders are still expected to be up to twice as power efficient. However, due to the missing hot clock of the shader domain, two shaders of a Kepler chip are as fast as one shader of a Fermi chip (the latter is clocked twice as fast). PCIe 3.0 is now supported by the mobile Kepler series and an optional Turbo mode can automatically overclock the Nvidia card by a theoretical 15 percent if the laptop cooling system allows it. The implementation of this boost mode is done in the BIOS, but it is ultimately dependent upon the manufacturer of the laptop.

Performance

Due to a clock speed of just 500 MHz, the gaming performance of the GeForce GT 640M LE is about 20 percent below the 640M. This is the same level as the GT 635M or the GT 555M. The performance is exceptionally good in shader-heavy DirectX 11 games and benchmarks. However, the 128-Bit memory interface can be a bottleneck if DDR3 graphics memory is used. Demanding games of 2011 like Battlefield 3 are playable in 1366x768 and medium settings.

Features

The improved feature set now includes support for up to 4 active displays. Furthermore, high resolution monitors of up to 3840x2160 pixels can now be connected using DisplayPort 1.2 or HDMI 1.4a if available. HD-Audio codecs, such as Dolby TrueHD and DTS-HD, can be transmitted via bitstream mode through the HDMI port. However, as most laptops will feature Optimus, the integrated GPU will likely have direct control over the display ports and may limit the feature set available by the Nvidia Kepler cards.

The 5th generation PureVideo HD video processor (VP5) is also integrated in the GK107 core and offers hardware decoding of HD videos. Common codecs such as MPEG-1/2, MPEG-4 ASP, H.264 and VC1/WMV9 are fully supported up to 4K resolutions while VC1 and MPEG-4 are supported up to 1080p. Two streams can be decoded in parallel for features such as Picture-in-Picture. Another novelty is the inclusion of a dedicated video encoding engine similar to Intel QuickSync that can be accessed by the NVENC API.

The power consumption of the GeForce GT 640M LE is similar to the older GeForce GT 520M. As a result, the Nvidia GPU is suited for thin-and-light laptops.

ManufacturerNVIDIA
GeForce GT 600M Series

GeForce GT 650M SLI

768 @ 790 - 835 (Boost) MHz128 Bit @ 4000 MHz

GeForce GT 650M

384 @ 735 - 900 (Boost) MHz128 Bit @ 1800 - 4000 MHz

GeForce GT 645M

384 @ 710 MHz128 Bit @ 1800 MHz

GeForce GT 640M

384 @ 625 - 645 (Boost) MHz128 Bit @ 1800 - 4000 MHz
GeForce GT 640M LE 384 @ 500 MHz128 Bit @ 1800 - 4000 MHz

GeForce GT 635M

144 @ 660 - 753 (Boost) MHz128/192 Bit @ 1800 MHz

GeForce GT 630M

96 @ 672 MHz128 Bit @ 1800 MHz

GeForce GT 625M

96 @ 625 MHz64 Bit @ 1800 MHz

GeForce GT 620M

96 @ 625 - 715 (Boost) MHz64 / 128 Bit @ 1800 MHz
CodenameN13P-LP
ArchitectureFermi / Kepler
Pipelines384 - unified
Core Speed *500 MHz
Memory Speed *1800 - 4000 MHz
Memory Bus Width128 Bit
Memory TypeDDR3, GDDR5
Max. Amount of Memory2048 MB
Shared Memoryno
DirectXDirectX 11, Shader 5.0
technology28 nm
FeaturesOptimus, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play
Notebook Sizemedium sized
Date of Announcement22.03.2012
* The specified clock rates are only guidelines for the manufacturer and can be altered by them.

Benchmarks

Unigine Heaven 3.0 - high, Tesselation (normal), DirectX11 1280x1024
0% 100%
min: 16.5      avg: 16.5 (100%)     median: 16.5 (100%)     max: 16.5 fps
3DMark 11 - Performance GPU 1280x720
0% 100%
min: 1241      avg: 1349 (8%)     median: 1259 (7%)     max: 1590 points
3DMark 11 - Performance 1280x720
0% 100%
min: 1335      avg: 1401.6 (10%)     median: 1385 (10%)     max: 1519 points
3DMark Vantage - P GPU no PhysX 1280x1024
0% 100%
min: 2255      avg: 4528.4 (10%)     median: 4872 (11%)     max: 5557 Points
3DMark Vantage - P Result no PhysX 1280x1024
0% 100%
min: 2735      avg: 5212 (13%)     median: 5788 (14%)     max: 6182 Points
3DMark 06
0% 100%
min: 5639      avg: 8801.9 (23%)     median: 8858 (23%)     max: 11571 Points
3DMark 05 - Standard 1024x768
0% 100%
min: 13748      avg: 14777.3 (40%)     median: 15077 (41%)     max: 15507 Points
3DMark 03 - Standard 1024x768
0% 100%
min: 22952      avg: 23397.3 (16%)     median: 23258 (15%)     max: 23982 Points
Unigine Heaven 2.1 - high, Tesselation (normal), DirectX11 1280x1024
0% 100%
min: 17.1      avg: 17.7 (10%)     median: 17.4 (9%)     max: 18.5 fps
PCMark Vantage - Gaming Score 1024x768
0% 100%
min: 4831      avg: 8635 (33%)     median: 10350 (40%)     max: 12255 Points
Cinebench R11.5 - OpenGL 64Bit
0% 100%
min: 26.15      avg: 31.6 (26%)     median: 32 (26%)     max: 33.91 Points
Cinebench R10 - Shading 32Bit
0% 100%
min: 5824      avg: 5911.3 (40%)     median: 5858 (40%)     max: 6105 Points
Windows 7 Experience Index - Gaming graphics
0% 100%
min: 6.2      avg: 6.6 (84%)     median: 6.7 (84%)     max: 6.9 points
Windows 7 Experience Index - Graphics
0% 100%
min: 4.8      avg: 6.1 (77%)     median: 6.4 (80%)     max: 6.9 points
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card

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 detailled information on the benchmark results, click on the fps number.

Guild Wars 2
low 1024x768
51  fps      Compare
high 1366x768
26  fps      Compare
» With all tested laptops playable in detail settings low.
Max Payne 3
low 1024x768
33.3  fps      Compare
med. 1366x768
30.9  fps      Compare
high 1366x768
13.3  fps      Compare
ultra 1920x1080
10.4  fps      Compare
» The benchmarks indicate that the game is not playable in the tested settings.
Dirt Showdown
low 1024x768
73.8  fps      Compare
med. 1366x768
55.1  fps      Compare
high 1366x768
36.1  fps      Compare
ultra 1920x1080
13.4  fps      Compare
» With all tested laptops playable in detail settings high.
Diablo III
low 1024x768
98.6  fps      Compare
med. 1366x768
65.3  fps      Compare
high 1366x768
57.7  fps      Compare
ultra 1920x1080
42.5  fps      Compare
» With all tested laptops playable in detail settings ultra.
Risen 2: Dark Waters
low 1024x768
39.1  fps      Compare
med. 1366x768
25.1  fps      Compare
high 1366x768
20.3  fps      Compare
ultra 1920x1080
10.3  fps      Compare
» With all tested laptops playable in detail settings low.
Mass Effect 3
low 1280x720
60  fps      Compare
high 1366x768
39.1  fps      Compare
ultra 1920x1080
26.4  fps      Compare
» With all tested laptops playable in detail settings high.
Alan Wake

Alan Wake

2012
low 1024x768
42  fps      Compare
med. 1366x768
25.2  fps      Compare
ultra 1920x1080
11.2  fps      Compare
» With all tested laptops playable in detail settings low.
Anno 2070

Anno 2070

2011
low 1024x768
55 90.4 ~ 73 fps      Compare
med. 1366x768
30 40.5 ~ 35 fps      Compare
high 1366x768
19 25.1 ~ 22 fps      Compare
ultra 1920x1080
13.4  fps      Compare
» With all tested laptops playable in detail settings low.
The Elder Scrolls V: Skyrim
low 1280x720
31 45.7 47 48.4 49.2 ~ 44 fps      Compare
med. 1366x768
23 34.3 34.7 38 40.5 ~ 34 fps      Compare
high 1366x768
17 26.3 26.3 28 31.6 ~ 26 fps      Compare
ultra 1920x1080
12.9 14.5 18.6 ~ 15 fps      Compare
» With most tested laptops playable in detail settings low.
Battlefield 3
low 1024x768
38.1 41 ~ 40 fps      Compare
med. 1366x768
24.6 28 ~ 26 fps      Compare
high 1366x768
20.3 22 ~ 21 fps      Compare
ultra 1920x1080
8.9  fps      Compare
» With all tested laptops playable in detail settings low.
Fifa 12

Fifa 12

2011
low 800x600
308.1  fps      Compare
med. 1024x768
171  fps      Compare
high 1360x768
126.2  fps      Compare
ultra 1920x1080
82.7  fps      Compare
» With all tested laptops playable in detail settings ultra.
F1 2011

F1 2011

2011
low 800x600
91 105 ~ 98 fps      Compare
med. 1024x768
66 70 ~ 68 fps      Compare
high 1366x768
48 55 ~ 52 fps      Compare
ultra 1920x1080
17  fps      Compare
» With all tested laptops playable in detail settings high.
Deus Ex Human Revolution
low 1024x768
59 60 60 89.3 ~ 67 fps      Compare
high 1366x768
46 47 49 51.8 ~ 48 fps      Compare
ultra 1920x1080
17.4 19 19.1 ~ 19 fps      Compare