GeForce GT 640M vs GeForce GTX 870M

Find out if it is worth upgrading your current GPU setup by comparing GeForce GT 640M and GeForce GTX 870M. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce GT 640M and GeForce GTX 870M. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.

GeForce GT 640M and GeForce GTX 870M are Laptop Graphics Cards

Note: GeForce GT 640M and GeForce GTX 870M are only used in laptop graphics. They have lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with GeForce GT 640M or GeForce GTX 870M here:

Main Specs

  GeForce GT 640M GeForce GTX 870M
Power consumption (TDP) 32 Watt 100 Watt
Interface PCIe 3.0 x16 MXM-B (3.0)
Supplementary power connectors None
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 6 GB
Display Connectors No outputs No outputs
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  • GeForce GTX 870M has 212% more power consumption, than GeForce GT 640M.
  • GeForce GT 640M is connected by PCIe 3.0 x16, and GeForce GTX 870M uses MXM-B (3.0) interface.
  • GeForce GTX 870M has 4 GB more memory, than GeForce GT 640M.
  • Both cards are used in Laptops.
  • GeForce GT 640M and GeForce GTX 870M are build with Kepler architecture.
  • GeForce GT 640M and GeForce GTX 870M are manufactured by 28 nm process technology.

Game benchmarks

high / 1080p 0−1 16−18
ultra / 1080p 0−1 10−11
QHD / 1440p 0−1 4−5
low / 720p 10−12 35−40
medium / 1080p 2−3 21−24
The average gaming FPS of GeForce GTX 870M in Assassin's Creed Odyssey is 400% more, than GeForce GT 640M.

Full Specs

  GeForce GT 640M GeForce GTX 870M
Architecture Kepler Kepler
Code name N13P-GS N15P-GT
Type Laptop Laptop
Release date 22 March 2012 12 March 2014
Pipelines 384 1344
Core clock speed 941 MHz
Boost Clock 645 MHz 967 MHz
Transistor count 1,270 million 3,540 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 108.3
Floating-point performance 480.0 gflops 2,599 gflops
Memory bus width 128bit 192 Bit
Memory clock speed 1800 - 4000 MHz
Memory bandwidth 120.0 GB/s
Shared memory - -
DirectX 12 API 12 (11_0)
Shader Model 5.1 5.1
OpenGL 4.5 4.5
OpenCL 1.1 1.1
Vulkan 1.1.126 1.1.126
CUDA + +
CUDA cores 384 1344
Bus support PCI Express 2.0, PCI Express 3.0 PCI Express 2.0, PCI Express 3.0
SLI options +
HDMI + +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 18 Mh/s 82 Mh/s
Laptop size medium sized large
Standard memory configuration GDDR5
eDP 1.2 signal support Up to 3840x2160
LVDS signal support Up to 1920x1200
DisplayPort Multimode (DP++) support Up to 3840x2160
HDCP content protection +
7.1 channel HD audio on HDMI +
TrueHD and DTS-HD audio bitstreaming +
H.264, VC1, MPEG2 1080p video decoder +
Optimus + +
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