GeForce 945A vs GeForce GT 640M

In this comparison between GeForce 945A and GeForce GT 640M you will find out which graphics card performs better in today's games. Bear in mind that third-party versions may have more efficient cooling and higher clock speeds. This will increase cards' performance, though not by much. In addition to raw power you should also take into account the dimensions. Thicker models simply will not fit into a small mini-ITX case. The resolution of your monitor also affects the choice, since 4K gameplay requires a more powerful GPU. And don't overspend on the graphics card. Other parts of your build may also need to be upgraded, save some money for the CPU or power supply. For some people GeForce 945A will be the best choice, for others GeForce GT 640M will be their preference. Study the comparison tables below and make your choice.

GeForce GT 640M is a Laptop Graphics Card

Note: GeForce GT 640M is only used in laptop graphics. It has 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 here:

Main Specs

  GeForce 945A GeForce GT 640M
Power consumption (TDP) 33 Watt 32 Watt
Interface PCIe 3.0 x8 PCIe 3.0 x16
Memory type GDDR5 DDR3\GDDR5
Maximum RAM amount 1 GB 2 GB
Display Connectors No outputs No outputs
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  • GeForce 945A has 3% more power consumption, than GeForce GT 640M.
  • GeForce 945A is connected by PCIe 3.0 x8, and GeForce GT 640M uses PCIe 3.0 x16 interface.
  • GeForce GT 640M has 1 GB more memory, than GeForce 945A.
  • GeForce 945A is used in Desktops, and GeForce GT 640M - in Laptops.
  • GeForce 945A is build with Maxwell architecture, and GeForce GT 640M - with Kepler.
  • GeForce 945A and GeForce GT 640M are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce 945A is 3212 MHz higher, than GeForce GT 640M.

Game benchmarks

high / 1080p 9−10 0−1
ultra / 1080p 5−6 0−1
QHD / 1440p 0−1 0−1
low / 720p 20−22 10−12
medium / 1080p 10−12 2−3
The average gaming FPS of GeForce 945A in Assassin's Creed Odyssey is 166% more, than GeForce GT 640M.

Full Specs

  GeForce 945A GeForce GT 640M
Architecture Maxwell Kepler
Code name GM108 N13P-GS
Type Desktop Laptop
Release date 13 March 2015 22 March 2012
Pipelines 384 384
Core clock speed 1072 MHz
Boost Clock 1189 MHz 645 MHz
Transistor count 1,270 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 28.54
Floating-point performance 903.2 gflops 480.0 gflops
Memory bus width 64 Bit 128bit
Memory clock speed 5012 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 4.6 4.5
OpenCL 1.2 1.1
Vulkan 1.1.126 1.1.126
CUDA 5.0 +
CUDA cores 384
Bus support PCI Express 2.0, PCI Express 3.0
HDMI +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 108 Mh/s 18 Mh/s
Laptop size medium sized
Optimus +
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