GeForce GT 645M vs Radeon RX Vega 3

If you are going to buy a new graphics card and are choosing between GeForce GT 645M and Radeon RX Vega 3, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce GT 645M stacks up against Radeon RX Vega 3, check out specs charts below.

GeForce GT 645M and Radeon RX Vega 3 are Laptop Graphics Cards

Note: GeForce GT 645M and Radeon RX Vega 3 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 RX Vega 3 here:

Main Specs

  GeForce GT 645M Radeon RX Vega 3
Power consumption (TDP) 32 Watt
Interface PCIe 3.0 x16
Memory type DDR3\GDDR5
Maximum RAM amount 2 GB
Display Connectors No outputs
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  • Both cards are used in Laptops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon RX Vega 3 - with Vega.
  • GeForce GT 645M is manufactured by 28 nm process technology, and Radeon RX Vega 3 - by 14 nm process technology.

Game benchmarks

high / 1080p 1−2 2−3
ultra / 1080p 0−1 1−2
QHD / 1440p 0−1 0−1
low / 720p 12−14 14−16
medium / 1080p 2−3 4−5
The average gaming FPS of Radeon RX Vega 3 in Assassin's Creed Odyssey is 40% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Radeon RX Vega 3
Architecture Kepler Vega
Code name N13P-GS Vega Raven Ridge
Type Laptop Laptop
Release date 22 March 2012 7 January 2018
Pipelines 384 192
Boost Clock 1000 MHz
Transistor count 1,270 million
Manufacturing process technology 28 nm 14 nm
Texture fill rate 22.7 billion/sec
Floating-point performance 544.5 gflops
Memory bus width 128bit
Memory clock speed 1800 MHz
Shared memory - -
DirectX 12 API DirectX 12_1
Shader Model 5.1
OpenGL 4.5
OpenCL 1.1
Vulkan 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) 19 Mh/s
Laptop size medium sized
Optimus +
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