GeForce GT 645M vs Radeon R9 M270X

When choosing between GeForce GT 645M and Radeon R9 M270X, 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 645M and Radeon R9 M270X.

GeForce GT 645M is a Laptop Graphics Card

Note: GeForce GT 645M is only used in laptop graphics. It has 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 here:

Main Specs

  GeForce GT 645M Radeon R9 M270X
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 M270X has 2 GB more memory, than GeForce GT 645M.
  • GeForce GT 645M is used in Laptops, and Radeon R9 M270X - in Desktops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon R9 M270X - with GCN 1.0.
  • GeForce GT 645M and Radeon R9 M270X are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce GT 645M is 675 MHz higher, than Radeon R9 M270X.

Game benchmarks

high / 1080p 1−2 6−7
ultra / 1080p 0−1 4−5
QHD / 1440p 0−1 0−1
low / 720p 12−14 16−18
medium / 1080p 2−3 8−9
The average gaming FPS of Radeon R9 M270X in Assassin's Creed Odyssey is 100% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Radeon R9 M270X
Architecture Kepler GCN 1.0
Code name N13P-GS Venus
Type Laptop Desktop
Release date 22 March 2012 21 March 2014
Pipelines 384 640
Core clock speed 725 MHz
Boost Clock 775 MHz
Transistor count 1,270 million 1,500 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 22.7 billion/sec 31.00
Floating-point performance 544.5 gflops 1,536 gflops
Memory bus width 128bit 128 Bit
Memory clock speed 1800 MHz 1125 MHz
Memory bandwidth 72 GB/s
Shared memory -
DirectX 12 API
Shader Model 5.1 5.1
OpenGL 4.5 4.4
OpenCL 1.1 Not Listed
Vulkan 1.1.126
CUDA +
FreeSync +
CUDA cores 384
Bus support PCI Express 2.0, PCI Express 3.0 PCIe 3.0 x16
HDMI +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 19 Mh/s
Laptop size medium sized
Optimus +
Eyefinity +
HD3D +
PowerTune +
DualGraphics +
ZeroCore +
Switchable graphics +
Mantle +
Compute units 10
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