GeForce 940MX vs GeForce GT 640M LE

When choosing between GeForce 940MX and GeForce GT 640M LE, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between GeForce 940MX and GeForce GT 640M LE.

GeForce 940MX and GeForce GT 640M LE are Laptop Graphics Cards

Note: GeForce 940MX and GeForce GT 640M LE 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 940MX or GeForce GT 640M LE here:

Main Specs

  GeForce 940MX GeForce GT 640M LE
Power consumption (TDP) 23 Watt 20 Watt
Interface PCIe 3.0 x8 PCIe 2.0 x16
Supplementary power connectors None
Memory type DDR3, GDDR5 DDR3\DDR5
Maximum RAM amount 4 GB 2 GB
Display Connectors No outputs No outputs
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  • GeForce 940MX has 15% more power consumption, than GeForce GT 640M LE.
  • GeForce 940MX is connected by PCIe 3.0 x8, and GeForce GT 640M LE uses PCIe 2.0 x16 interface.
  • GeForce 940MX has 2 GB more memory, than GeForce GT 640M LE.
  • Both cards are used in Laptops.
  • GeForce 940MX is build with Maxwell architecture, and GeForce GT 640M LE - with Fermi / Kepler.
  • GeForce 940MX and GeForce GT 640M LE are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce 940MX is 2200 MHz higher, than GeForce GT 640M LE.

Game benchmarks

high / 1080p 7−8 0−1
ultra / 1080p 4−5
QHD / 1440p 0−1 0−1
low / 720p 16−18 1−2
medium / 1080p 8−9 0−1
The average gaming FPS of GeForce 940MX in Assassin's Creed Odyssey is 1600% more, than GeForce GT 640M LE.

Full Specs

  GeForce 940MX GeForce GT 640M LE
Architecture Maxwell Fermi / Kepler
Code name N16S-GTR-B/S N13P-LP
Type Laptop Laptop
Release date 10 March 2016 22 March 2012
Pipelines 384 384
Core clock speed 1122 MHz
Boost Clock 1242 MHz
Transistor count 1,870 million 585 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 23.83
Floating-point performance 762.6 gflops 384.0 gflops
Memory bus width 64 Bit 128bit
Memory clock speed 4000 MHz 1800 - 4000 MHz
Memory bandwidth 40.1 GB/s
Shared memory - -
DirectX 12 (11_0) 12 API
Shader Model 5.1 5.1
OpenGL 4.5 4.5
OpenCL 1.2 1.1
Vulkan 1.1 N/A
CUDA + +
CUDA cores Up to 384
Bus support PCI Express 3.0 PCI Express 2.0, PCI Express 3.0
HDMI +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 102 Mh/s 14 Mh/s
Laptop size medium sized medium sized
Optimus + +
GPU Boost 2.0
GameWorks +
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