GeForce GT 645M vs Radeon HD 7870M

In this comparison between GeForce GT 645M and Radeon HD 7870M 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 HD 7870M will be their preference. Study the comparison tables below and make your choice.

GeForce GT 645M and Radeon HD 7870M are Laptop Graphics Cards

Note: GeForce GT 645M and Radeon HD 7870M 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 HD 7870M here:

Main Specs

  GeForce GT 645M Radeon HD 7870M
Power consumption (TDP) 32 Watt 45 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x16
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 2 GB
Display Connectors No outputs No outputs
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  • Radeon HD 7870M has 40% more power consumption, than GeForce GT 645M.
  • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
  • GeForce GT 645M and Radeon HD 7870M have maximum RAM of 2 GB.
  • Both cards are used in Laptops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon HD 7870M - with GCN.
  • GeForce GT 645M and Radeon HD 7870M are manufactured by 28 nm process technology.
  • Memory clock speed of Radeon HD 7870M is 2200 MHz higher, than GeForce GT 645M.

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 HD 7870M in Assassin's Creed Odyssey is 100% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Radeon HD 7870M
Architecture Kepler GCN
Code name N13P-GS Heathrow XT
Type Laptop Laptop
Release date 22 March 2012 24 April 2012
Pipelines 384 640
Core clock speed 800 MHz
Transistor count 1,270 million 1,500 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 22.7 billion/sec 32.00
Floating-point performance 544.5 gflops 1,024 gflops
Memory bus width 128bit 128 Bit
Memory clock speed 1800 MHz 4000 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) 19 Mh/s
Laptop size medium sized large
Optimus +
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