GeForce GTX 660M vs Radeon Pro 580X

Find out if it is worth upgrading your current GPU setup by comparing GeForce GTX 660M and Radeon Pro 580X. 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 GTX 660M and Radeon Pro 580X. 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 GTX 660M is a Laptop Graphics Card

Note: GeForce GTX 660M 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 GTX 660M here:

Main Specs

  GeForce GTX 660M Radeon Pro 580X
Power consumption (TDP) 50 Watt 150 Watt
Interface MXM-B (3.0) PCIe 3.0 x16
Supplementary power connectors None
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 8 GB
Display Connectors No outputs No outputs
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  • Radeon Pro 580X has 200% more power consumption, than GeForce GTX 660M.
  • GeForce GTX 660M is connected by MXM-B (3.0), and Radeon Pro 580X uses PCIe 3.0 x16 interface.
  • Radeon Pro 580X has 6 GB more memory, than GeForce GTX 660M.
  • GeForce GTX 660M is used in Laptops, and Radeon Pro 580X - in Desktops.
  • GeForce GTX 660M is build with Kepler architecture, and Radeon Pro 580X - with GCN 4.0.
  • Core clock speed of Radeon Pro 580X is 265 MHz higher, than GeForce GTX 660M.
  • GeForce GTX 660M is manufactured by 28 nm process technology, and Radeon Pro 580X - by 14 nm process technology.
  • Memory clock speed of Radeon Pro 580X is 4780 MHz higher, than GeForce GTX 660M.

Game benchmarks

high / 1080p 6−7 35−40
ultra / 1080p 4−5 24−27
QHD / 1440p 0−1 18−20
4K / 2160p 10−12
low / 720p 16−18 60−65
medium / 1080p 8−9 45−50
The average gaming FPS of Radeon Pro 580X in Assassin's Creed Odyssey is 377% more, than GeForce GTX 660M.

Full Specs

  GeForce GTX 660M Radeon Pro 580X
Architecture Kepler GCN 4.0
Code name N13E-GE Polaris 20
Type Laptop Workstation
Release date 22 March 2012 18 March 2019
Pipelines 384 2304
Core clock speed 835 MHz 1100 MHz
Boost Clock 950 MHz 1200 MHz
Transistor count 1,270 million 5,700 million
Manufacturing process technology 28 nm 14 nm
Texture fill rate 30.4 billion/sec 172.8
Floating-point performance 729.6 gflops
Memory bus width 128bit 256 Bit
Memory clock speed 2000 MHz 6780 MHz
Memory bandwidth 64.0 GB/s 217.0 GB/s
Shared memory -
DirectX 12 API 12 (12_0)
Shader Model 5.1 6.4
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
SLI options +
HDMI +
HDCP +
Maximum VGA resolution Up to 2048x1536
Bitcoin / BTC (SHA256) 36 Mh/s
Laptop size large
Optimus +
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