GeForce GT 640M vs Radeon R9 M275

When choosing between GeForce GT 640M and Radeon R9 M275, 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 R9 M275.

GeForce GT 640M and Radeon R9 M275 are Laptop Graphics Cards

Note: GeForce GT 640M and Radeon R9 M275 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 R9 M275 here:

Main Specs

  GeForce GT 640M Radeon R9 M275
Power consumption (TDP) 32 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x16
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 4 GB
Display Connectors No outputs No outputs
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  • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
  • Radeon R9 M275 has 2 GB more memory, than GeForce GT 640M.
  • Both cards are used in Laptops.
  • GeForce GT 640M is build with Kepler architecture, and Radeon R9 M275 - with GCN.
  • GeForce GT 640M and Radeon R9 M275 are manufactured by 28 nm process technology.
  • Memory clock speed of Radeon R9 M275 is 2700 MHz higher, than GeForce GT 640M.

Game benchmarks

high / 1080p 0−1 0−1
ultra / 1080p 0−1
QHD / 1440p 0−1 0−1
low / 720p 10−12 12−14
medium / 1080p 2−3 3−4
The average gaming FPS of Radeon R9 M275 in Assassin's Creed Odyssey is 33% more, than GeForce GT 640M.

Full Specs

  GeForce GT 640M Radeon R9 M275
Architecture Kepler GCN
Code name N13P-GS Venus
Type Laptop Laptop
Release date 22 March 2012 1 August 2014
Pipelines 384 640
Core clock speed 925 MHz
Boost Clock 645 MHz 925 MHz
Transistor count 1,270 million 1,500 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 37.00
Floating-point performance 480.0 gflops 1,184 gflops
Memory bus width 128bit 128 Bit
Memory clock speed 1800 - 4000 MHz 4500 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 122 Mh/s
Laptop size medium sized large
Optimus +
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