GeForce 845M vs GeForce GT 640M

In this comparison between GeForce 845M 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 845M will be the best choice, for others GeForce GT 640M will be their preference. Study the comparison tables below and make your choice.

GeForce 845M and GeForce GT 640M are Laptop Graphics Cards

Note: GeForce 845M and GeForce GT 640M 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 845M or GeForce GT 640M here:

Main Specs

  GeForce 845M GeForce GT 640M
Power consumption (TDP) 45 Watt 32 Watt
Interface PCIe 3.0 x8 PCIe 3.0 x16
Memory type DDR3, GDDR5 DDR3\GDDR5
Maximum RAM amount 2 GB 2 GB
Display Connectors No outputs No outputs
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  • GeForce 845M has 40% more power consumption, than GeForce GT 640M.
  • GeForce 845M is connected by PCIe 3.0 x8, and GeForce GT 640M uses PCIe 3.0 x16 interface.
  • GeForce 845M and GeForce GT 640M have maximum RAM of 2 GB.
  • Both cards are used in Laptops.
  • GeForce 845M is build with Maxwell architecture, and GeForce GT 640M - with Kepler.
  • GeForce 845M and GeForce GT 640M are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce 845M is 200 MHz higher, than GeForce GT 640M.

Game benchmarks

high / 1080p 3−4 0−1
ultra / 1080p 1−2 0−1
QHD / 1440p 0−1 0−1
low / 720p 14−16 10−12
medium / 1080p 6−7 2−3
The average gaming FPS of GeForce 845M in Assassin's Creed Odyssey is 66% more, than GeForce GT 640M.

Full Specs

  GeForce 845M GeForce GT 640M
Architecture Maxwell Kepler
Code name GM108 N13P-GS
Type Laptop Laptop
Release date 12 March 2014 22 March 2012
Pipelines 384 384
Core clock speed 1071 MHz
Boost Clock 1150 MHz 645 MHz
Transistor count 1,870 million 1,270 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 37.63
Floating-point performance 883.7 gflops 480.0 gflops
Memory bus width 64/128 Bit 128bit
Memory clock speed 2000 - 5000 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 + +
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) 76 Mh/s 18 Mh/s
Laptop size medium sized medium sized
Optimus + +
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