GeForce GT 645M vs Radeon R6 M340DX

In this comparison between GeForce GT 645M and Radeon R6 M340DX 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 GT 645M will be the best choice, for others Radeon R6 M340DX will be their preference. Study the comparison tables below and make your choice.

GeForce GT 645M and Radeon R6 M340DX are Laptop Graphics Cards

Note: GeForce GT 645M and Radeon R6 M340DX 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 645M or Radeon R6 M340DX here:

Main Specs

  GeForce GT 645M Radeon R6 M340DX
Power consumption (TDP) 32 Watt
Interface PCIe 3.0 x16 IGP
Memory type DDR3\GDDR5 DDR3
Maximum RAM amount 2 GB
Display Connectors No outputs No outputs
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  • GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon R6 M340DX uses IGP interface.
  • Both cards are used in Laptops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon R6 M340DX - with GCN.
  • GeForce GT 645M and Radeon R6 M340DX are manufactured by 28 nm process technology.

Game benchmarks

high / 1080p 1−2 2−3
ultra / 1080p 0−1 2−3
QHD / 1440p 0−1 0−1
low / 720p 12−14 10−11
medium / 1080p 2−3 3−4
GeForce GT 645M and Radeon R6 M340DX have the same average FPS in Assassin's Creed Odyssey.

Full Specs

  GeForce GT 645M Radeon R6 M340DX
Architecture Kepler GCN
Code name N13P-GS Jet
Type Laptop Laptop
Release date 22 March 2012 3 June 2015
Pipelines 384 704
Boost Clock 1030 MHz
Transistor count 1,270 million 690 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 22.7 billion/sec 24.72
Floating-point performance 544.5 gflops
Memory bus width 128bit
Memory clock speed 1800 MHz
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) 19 Mh/s
Laptop size medium sized medium sized
Optimus +
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