GeForce GT 640M vs Radeon HD 7850M

When choosing between GeForce GT 640M and Radeon HD 7850M, 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 GT 640M and Radeon HD 7850M.

GeForce GT 640M and Radeon HD 7850M are Laptop Graphics Cards

Note: GeForce GT 640M and Radeon HD 7850M 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 Radeon HD 7850M here:

Main Specs

  GeForce GT 640M Radeon HD 7850M
Power consumption (TDP) 32 Watt 40 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x16
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 2 GB
Display Connectors No outputs No outputs
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  • Radeon HD 7850M has 25% more power consumption, than GeForce GT 640M.
  • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
  • GeForce GT 640M and Radeon HD 7850M have maximum RAM of 2 GB.
  • Both cards are used in Laptops.
  • GeForce GT 640M is build with Kepler architecture, and Radeon HD 7850M - with GCN.
  • GeForce GT 640M and Radeon HD 7850M are manufactured by 28 nm process technology.
  • Memory clock speed of Radeon HD 7850M is 2200 MHz higher, than GeForce GT 640M.

Game benchmarks

high / 1080p 0−1 6−7
ultra / 1080p 0−1 3−4
QHD / 1440p 0−1 0−1
low / 720p 10−12 14−16
medium / 1080p 2−3 7−8
The average gaming FPS of Radeon HD 7850M in Assassin's Creed Odyssey is 83% more, than GeForce GT 640M.

Full Specs

  GeForce GT 640M Radeon HD 7850M
Architecture Kepler GCN
Code name N13P-GS Heathrow Pro
Type Laptop Laptop
Release date 22 March 2012 24 April 2012
Pipelines 384 640
Core clock speed 675 MHz
Boost Clock 645 MHz
Transistor count 1,270 million 1,500 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 27.00
Floating-point performance 480.0 gflops 864.0 gflops
Memory bus width 128bit 128 Bit
Memory clock speed 1800 - 4000 MHz 4000 MHz
Memory bandwidth 64 GB/s
Shared memory - -
DirectX 12 API 12 (11_1)
Shader Model 5.1 5.1
OpenGL 4.5 4.6
OpenCL 1.1 1.2
Vulkan 1.1.126 1.2.131
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) 18 Mh/s
Laptop size medium sized large
Optimus +
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