GeForce GT 645M vs Radeon HD 7870

Find out if it is worth upgrading your current GPU setup by comparing GeForce GT 645M and Radeon HD 7870. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce GT 645M and Radeon HD 7870. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.

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 HD 7870
Power consumption (TDP) 32 Watt 175 Watt
Interface PCIe 3.0 x16
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 2 GB
Display Connectors No outputs
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  • Radeon HD 7870 has 446% more power consumption, than GeForce GT 645M.
  • GeForce GT 645M and Radeon HD 7870 have maximum RAM of 2 GB.
  • GeForce GT 645M is used in Laptops, and Radeon HD 7870 - in Desktops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon HD 7870 - with GCN.
  • GeForce GT 645M and Radeon HD 7870 are manufactured by 28 nm process technology.
  • Memory clock speed of Radeon HD 7870 is 3000 MHz higher, than GeForce GT 645M.

Game benchmarks

high / 1080p 1−2 24−27
ultra / 1080p 0−1 14−16
QHD / 1440p 0−1 9−10
4K / 2160p 6−7
low / 720p 12−14 45−50
medium / 1080p 2−3 30−33
The average gaming FPS of Radeon HD 7870 in Assassin's Creed Odyssey is 580% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Radeon HD 7870
Architecture Kepler GCN
Code name N13P-GS Pitcairn XT
Type Laptop Desktop
Release date 22 March 2012 5 March 2012
Pipelines 384 1280
Core clock speed 1000 MHz
Transistor count 1,270 million 2800 Million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 22.7 billion/sec
Floating-point performance 544.5 gflops
Memory bus width 128bit 256 Bit
Memory clock speed 1800 MHz 4800 MHz
Shared memory - -
DirectX 12 API DirectX 11.1, Shader 5.1
Shader Model 5.1
OpenGL 4.5
OpenCL 1.1
Vulkan 1.1.126
CUDA +
Monero / XMR (CryptoNight) 0.39 kh/s
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 +
Eyefinity +
Decred / DCR (Decred) 0.63 Gh/s
Ethereum / ETH (DaggerHashimoto) 16.6 Mh/s
Zcash / ZEC (Equihash) 145 Sol/s
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