GeForce GT 645M vs Radeon R9 M485X

In this comparison between GeForce GT 645M and Radeon R9 M485X 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 R9 M485X will be their preference. Study the comparison tables below and make your choice.

GeForce GT 645M and Radeon R9 M485X are Laptop Graphics Cards

Note: GeForce GT 645M and Radeon R9 M485X 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 R9 M485X here:

Main Specs

  GeForce GT 645M Radeon R9 M485X
Power consumption (TDP) 32 Watt 250 Watt
Interface PCIe 3.0 x16 MXM-B (3.0)
Supplementary power connectors None
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 8 GB MB
Display Connectors No outputs No outputs
  Check Price Check Price
  • Radeon R9 M485X has 681% more power consumption, than GeForce GT 645M.
  • GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon R9 M485X uses MXM-B (3.0) interface.
  • Radeon R9 M485X has 6 GB more memory, than GeForce GT 645M.
  • Both cards are used in Laptops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon R9 M485X - with GCN 3.
  • GeForce GT 645M and Radeon R9 M485X are manufactured by 28 nm process technology.
  • Memory clock speed of Radeon R9 M485X is 3200 MHz higher, than GeForce GT 645M.

Game benchmarks

high / 1080p 1−2 24−27
ultra / 1080p 0−1 14−16
QHD / 1440p 0−1 10−11
4K / 2160p 6−7
low / 720p 12−14 45−50
medium / 1080p 2−3 30−35
The average gaming FPS of Radeon R9 M485X in Assassin's Creed Odyssey is 600% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Radeon R9 M485X
Architecture Kepler GCN 3
Code name N13P-GS Amethyst
Type Laptop Laptop
Release date 22 March 2012 14 May 2016
Pipelines 384 2048
Core clock speed 723 MHz
Transistor count 1,270 million 5,000 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 22.7 billion/sec 92.54
Floating-point performance 544.5 gflops 2,961 gflops
Memory bus width 128bit 256 Bit
Memory clock speed 1800 MHz 5000 MHz
Memory bandwidth 160.0 GB/s
Shared memory - -
DirectX 12 API 12 (12_0)
Shader Model 5.1 6.3
OpenGL 4.5 4.6
OpenCL 1.1 2.0
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 large
Optimus +
  Check Price Check Price