NVIDIA GeForce GT 640M

NVIDIA GeForce GT 640M

The NVIDIA GeForce GT 640M is a mid-range, DirectX 11.1 compatible graphics card that was announced in the first quarter of 2012 for 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 either the more common but slower DDR3 for VRAM or the more expensive and faster GDDR5.

Architecture

The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M 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

The gaming performance of the GeForce GT 640M equipped with DDR3 graphics memory lies somewhere in the former 2011 high-end category between the older GeForce GT 555M and GeForce GTX 460M. 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. In our tests, demanding games of 2011 like Battlefield 3 are playable in 1366x768 and medium settings. Less demanding games, such as Modern Warfare 3, are easily playable with maxed out settings and high resolutions. Details on synthetic and gaming benchmarks performances of the GT 640M can be seen below. The more uncommon GDDR5 version of the GT 640M is slightly faster, getting closer to the DDR3 version of the GT 650M.

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 NVENCI API.

The power consumption of the GeForce GT 640M is a bit below that of the older GeForce GT 540M and more in line with the GT 525M. As a result, the Nvidia GPU is best suited for multimedia notebooks 14-inches or greater.

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-GS
ArchitectureKepler
Pipelines384 - unified
Core Speed *625 - 645 (Boost) 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

Cinebench R15 - Ref. Match 64Bit
0% 100%
min: 99.6      avg: 99.6 (100%)     median: 99.6 (100%)     max: 99.6 Points
Cinebench R15 - OpenGL 64Bit
0% 100%
min: 42.42      avg: 42.4 (35%)     median: 42.4 (35%)     max: 42.42 Points
3DMark (2013) - Fire Strike Standard Graphics 1920x1080
0% 100%
min: 1225      avg: 1225 (10%)     median: 1225 (10%)     max: 1225 Points
3DMark (2013) - Cloud Gate Standard Graphics 1280x720
0% 100%
min: 9024      avg: 9024 (12%)     median: 9024 (12%)     max: 9024 Points
3DMark (2013) - Ice Storm Unlimited Graphics Score 1280x720 offscreen
0% 100%
min: 80836      avg: 80836 (28%)     median: 80836 (28%)     max: 80836 Points
3DMark (2013) - Ice Storm Standard Graphics 1280x720
0% 100%
min: 85201      avg: 85201 (11%)     median: 85201 (11%)     max: 85201 Points
ComputeMark v2.1 - Normal, Score 1024x600
0% 100%
min: 1114      avg: 1114 (19%)     median: 1114 (19%)     max: 1114 Points
LuxMark v2.0 64Bit - Room Scene, OpenCL GPUs-only
0% 100%
min: 47      avg: 47 (3%)     median: 47 (3%)     max: 47 Samples/s
LuxMark v2.0 64Bit - Sala Scene, OpenCL GPUs-only
0% 100%
min: 101      avg: 101 (4%)     median: 101 (4%)     max: 101 Samples/s
3DMark 11 - Performance GPU 1280x720
0% 100%
min: 1534      avg: 1708.3 (11%)     median: 1728 (11%)     max: 1778 points
3DMark 11 - Performance 1280x720
0% 100%
min: 1691      avg: 1854.9 (14%)     median: 1860.5 (14%)     max: 1968 points
3DMark Vantage - P GPU no PhysX 1280x1024
0% 100%
min: 5773      avg: 6577.8 (14%)     median: 6348 (14%)     max: 7440 Points
3DMark Vantage - P Result no PhysX 1280x1024
0% 100%
min: 6648      avg: 7412.7 (19%)     median: 7425 (19%)     max: 8551 Points
3DMark 06
0% 100%
min: 10001      avg: 11136.4 (37%)     median: 10625.5 (35%)     max: 12843 Points
3DMark 05 - Standard 1024x768
0% 100%
min: 15287      avg: 17104.8 (46%)     median: 16784 (46%)     max: 19564 Points
3DMark 03 - Standard 1024x768
0% 100%
min: 28232      avg: 29495 (20%)     median: 29298.5 (19%)     max: 31151 Points
3DMark 2001SE - Standard 1024x768
0% 100%
min: 12955      avg: 12955 (21%)     median: 12955 (21%)     max: 12955 Points
Unigine Heaven 2.1 - high, Tesselation (normal), DirectX11 1280x1024
0% 100%
min: 22.5      avg: 23.9 (13%)     median: 23.5 (13%)     max: 26 fps
PCMark Vantage - Gaming Score 1024x768
0% 100%
min: 4646      avg: 8202.4 (31%)     median: 7358.5 (28%)     max: 13470 Points
SPECviewperf 11 - Siemens NX 1920x1080
0% 100%
min: 2.48      avg: 2.5 (4%)     median: 2.5 (4%)     max: 2.6 fps
SPECviewperf 11 - Tcvis 1920x1080
0% 100%
min: 0.71      avg: 0.8 (1%)     median: 0.8 (1%)     max: 0.82 fps
SPECviewperf 11 - SolidWorks 1920x1080
0% 100%
min: 5.97      avg: 6.6 (10%)     median: 6.6 (10%)     max: 7.17 fps
SPECviewperf 11 - Pro/ENGINEER 1920x1080
0% 100%
min: 1.07      avg: 1.7 (9%)     median: 1.7 (9%)     max: 2.23 fps
SPECviewperf 11 - Maya 1920x1080
0% 100%
min: 8.97      avg: 9.9 (9%)     median: 9.9 (9%)     max: 10.86 fps
SPECviewperf 11 - Lightwave 1920x1080
0% 100%
min: 9.11      avg: 11.8 (15%)     median: 11.8 (15%)     max: 14.44 fps
SPECviewperf 11 - Ensight 1920x1080
0% 100%
min: 18.15      avg: 18.3 (23%)     median: 18.3 (23%)     max: 18.39 fps
SPECviewperf 11 - Catia 1920x1080
0% 100%
min: 6.75      avg: 6.9 (10%)     median: 6.9 (10%)     max: 7.14 fps
Cinebench R11.5 - OpenGL 64Bit
0% 100%
min: 32.37      avg: 37.4 (34%)     median: 37.6 (34%)     max: 41.86 Points
Cinebench R10 - Shading 32Bit
0% 100%
min: 4578      avg: 5741.4 (47%)     median: 5635 (47%)     max: 7081 Points
Windows 7 Experience Index - Gaming graphics
0% 100%
min: 6.7      avg: 6.9 (87%)     median: 6.9 (87%)     max: 7 points
Windows 7 Experience Index - Graphics
0% 100%
min: 4.6      avg: 6.3 (80%)     median: 6.9 (87%)     max: 7 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.

Risen 3: Titan Lords
low 1024x768
49  fps      Compare
med. 1366x768
27.7  fps      Compare
high 1920x1080
13.1  fps      Compare
ultra 1920x1080
11  fps      Compare
» With all tested laptops playable in detail settings low.
GRID: Autosport
low 1024x768
120  fps      Compare
med. 1366x768
68  fps      Compare
high 1920x1080
32.8  fps      Compare
ultra 1920x1080
16.2  fps      Compare
» With all tested laptops playable in detail settings med..
Watch Dogs
low 1024x768
33.8  fps      Compare
med. 1366x768
25.4  fps      Compare
high 1920x1080
5.9  fps      Compare
» The benchmarks indicate that the game is not playable in the tested settings.
Wolfenstein: The New Order
low 1280x720
50  fps      Compare
med. 1280x720
46.3  fps      Compare
high 1920x1080
21.1  fps      Compare
» With all tested laptops playable in detail settings med..
The Elder Scrolls Online
low 1024x768
56  fps      Compare
med. 1366x768
45  fps      Compare
high 1366x768
32.4  fps      Compare
ultra 1920x1080
17.7  fps      Compare
» With all tested laptops playable in detail settings med..
Titanfall

Titanfall

2014
low 1024x768
53  fps      Compare
med. 1366x768
33  fps      Compare
high 1366x768
25  fps      Compare
ultra 1920x1080
9.5  fps      Compare
» With all tested laptops playable in detail settings low.
Thief

Thief

2014
low 1024x768
24.8  fps      Compare
med. 1366x768
19.2  fps      Compare
high 1366x768
14.6  fps      Compare
ultra 1920x1080
7.2  fps      Compare
» The benchmarks indicate that the game is not playable in the tested settings.
Assassin´s Creed IV: Black Flag
low 1024x768
40.3  fps      Compare
med. 1366x768
32.1  fps      Compare
high 1366x768
18.5  fps      Compare
ultra 1920x1080
9.5  fps      Compare
» With all tested laptops playable in detail settings low.
X-Plane 10.25
low 1024x768
65  fps      Compare