GeForce GTX 660 vs Radeon Pro 555X

When comparing GeForce GTX 660 and Radeon Pro 555X, we look primarily at benchmarks and game tests. But it is not only about the numbers. Often you can find third-party models with higher clock speeds, better cooling, or a customizable RGB lighting. Not all of them will have all the features you need. Another thing to consider is the port selection. Most graphics cards have at least one DisplayPort and HDMI interface, but some monitors require DVI. Before you buy, check the TDP of the graphics card - this characteristic will help you estimate the consumption of the graphics card. You may even have to upgrade your PSU to meet its requirements. An important factor when choosing between GeForce GTX 660 and Radeon Pro 555X is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.

Radeon Pro 555X is a Laptop Graphics Card

Note: Radeon Pro 555X 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 Radeon Pro 555X here:

Main Specs

  GeForce GTX 660 Radeon Pro 555X
Power consumption (TDP) 140 Watt 75 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x8
Supplementary power connectors One 6-pin None
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 2 GB
Display Connectors 2x DVI, 1x HDMI, 1x DisplayPort No outputs
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  • GeForce GTX 660 has 86% more power consumption, than Radeon Pro 555X.
  • GeForce GTX 660 is connected by PCIe 3.0 x16, and Radeon Pro 555X uses PCIe 3.0 x8 interface.
  • GeForce GTX 660 and Radeon Pro 555X have maximum RAM of 2 GB.
  • GeForce GTX 660 is used in Desktops, and Radeon Pro 555X - in Mobile workstations.
  • GeForce GTX 660 is build with Kepler architecture, and Radeon Pro 555X - with Polaris.
  • Core clock speed of GeForce GTX 660 is 125 MHz higher, than Radeon Pro 555X.
  • GeForce GTX 660 is manufactured by 28 nm process technology, and Radeon Pro 555X - by 14 nm process technology.
  • Memory clock speed of Radeon Pro 555X is 5074 MHz higher, than GeForce GTX 660.

Game benchmarks

high / 1080p 20−22 16−18
ultra / 1080p 12−14 10−11
QHD / 1440p 6−7 4−5
4K / 2160p 5−6 4−5
low / 720p 40−45 30−35
medium / 1080p 24−27 21−24
The average gaming FPS of GeForce GTX 660 in Assassin's Creed Odyssey is 26% more, than Radeon Pro 555X.

Full Specs

  GeForce GTX 660 Radeon Pro 555X
Architecture Kepler Polaris
Code name GK106 Polaris 21
Type Desktop Mobile workstation
Release date 6 September 2012 5 June 2017
Pipelines 960 768
Core clock speed 980 MHz 855 MHz
Boost Clock 1033 MHz
Transistor count 2,540 million 3,000 million
Manufacturing process technology 28 nm 14 nm
Texture fill rate 78.4 billion/sec 43.54
Floating-point performance 1,981 gflops
Length 9.5" (24.1 cm)
Memory bus width 192-bit GDDR5 128 Bit
Memory clock speed 6.0 GB/s 5080 MHz
Memory bandwidth 144.2 GB/s 81.6 GB/s
Shared memory -
DirectX 12 (11_0) 12 (12_0)
Shader Model 5.1 6.4
OpenGL 4.3 4.6
OpenCL 1.2 2.0
Vulkan 1.1.126 1.2.131
CUDA +
FreeSync +
CUDA cores 960
Bus support PCI Express 3.0
Height 4.376" (11.1 cm)
SLI options +
Multi monitor support 4 displays
HDMI +
HDCP +
Maximum VGA resolution 2048x1536
Audio input for HDMI Internal
3D Blu-Ray +
3D Gaming +
3D Vision +
Bitcoin / BTC (SHA256) 66 Mh/s
Laptop size large
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