GeForce 940M vs GeForce GT 645M

When comparing GeForce 940M and GeForce GT 645M, we look primarily at benchmarks and game tests. But it is not only about the numbers. Often you can find third-party models with higher clock speeds, better cooling, or a customizable RGB lighting. Not all of them will have all the features you need. Another thing to consider is the port selection. Most graphics cards have at least one DisplayPort and HDMI interface, but some monitors require DVI. Before you buy, check the TDP of the graphics card - this characteristic will help you estimate the consumption of the graphics card. You may even have to upgrade your PSU to meet its requirements. An important factor when choosing between GeForce 940M and GeForce GT 645M is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.

GeForce 940M and GeForce GT 645M are Laptop Graphics Cards

Note: GeForce 940M and GeForce GT 645M 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 940M or GeForce GT 645M here:

Main Specs

  GeForce 940M GeForce GT 645M
Power consumption (TDP) 75 Watt 32 Watt
Interface PCIe 3.0 x8 PCIe 3.0 x16
Memory type DDR3 DDR3\GDDR5
Maximum RAM amount 4 GB 2 GB
Display Connectors No outputs No outputs
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  • GeForce 940M has 134% more power consumption, than GeForce GT 645M.
  • GeForce 940M is connected by PCIe 3.0 x8, and GeForce GT 645M uses PCIe 3.0 x16 interface.
  • GeForce 940M has 2 GB more memory, than GeForce GT 645M.
  • Both cards are used in Laptops.
  • GeForce 940M is build with Maxwell architecture, and GeForce GT 645M - with Kepler.
  • GeForce 940M and GeForce GT 645M are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce 940M is 200 MHz higher, than GeForce GT 645M.

Game benchmarks

high / 1080p 2−3 1−2
ultra / 1080p 1−2 0−1
QHD / 1440p 0−1 0−1
low / 720p 12−14 12−14
medium / 1080p 4−5 2−3
The average gaming FPS of GeForce 940M in Assassin's Creed Odyssey is 20% more, than GeForce GT 645M.

Full Specs

  GeForce 940M GeForce GT 645M
Architecture Maxwell Kepler
Code name N16S-GT-S/B N13P-GS
Type Laptop Laptop
Release date 12 March 2015 22 March 2012
Pipelines 384 384
Core clock speed 1072 MHz
Boost Clock 1176 MHz
Transistor count 1,870 million 1,270 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 28.22 22.7 billion/sec
Floating-point performance 903.2 gflops 544.5 gflops
Memory bus width 64 Bit 128bit
Memory clock speed 2000 MHz 1800 MHz
Memory bandwidth 14.4 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 1.1.126 1.1.126
CUDA + +
CUDA cores 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) 101 Mh/s 19 Mh/s
Laptop size medium sized medium sized
Optimus + +
GPU Boost 2.0
GameWorks +
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