GeForce GTX 660M vs Iris Pro Graphics 580

Find out if it is worth upgrading your current GPU setup by comparing GeForce GTX 660M and Iris Pro Graphics 580. 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 Iris Pro Graphics 580. 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 and Iris Pro Graphics 580 are Laptop Graphics Cards

Note: GeForce GTX 660M and Iris Pro Graphics 580 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 GTX 660M or Iris Pro Graphics 580 here:

Main Specs

  GeForce GTX 660M Iris Pro Graphics 580
Power consumption (TDP) 50 Watt 15 Watt
Interface MXM-B (3.0) PCIe 3.0 x1
Memory type GDDR5 DDR3L/LPDDR3/DDR4
Maximum RAM amount 2 GB 64 GB
Display Connectors No outputs No outputs
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  • GeForce GTX 660M has 233% more power consumption, than Iris Pro Graphics 580.
  • GeForce GTX 660M is connected by MXM-B (3.0), and Iris Pro Graphics 580 uses PCIe 3.0 x1 interface.
  • Iris Pro Graphics 580 has 62 GB more memory, than GeForce GTX 660M.
  • Both cards are used in Laptops.
  • GeForce GTX 660M is build with Kepler architecture, and Iris Pro Graphics 580 - with Gen. 9 Skylake.
  • Core clock speed of GeForce GTX 660M is 485 MHz higher, than Iris Pro Graphics 580.
  • GeForce GTX 660M is manufactured by 28 nm process technology, and Iris Pro Graphics 580 - by 14 nm process technology.

Game benchmarks

high / 1080p 6−7 9−10
ultra / 1080p 4−5 5−6
QHD / 1440p 0−1 0−1
low / 720p 16−18 20−22
medium / 1080p 8−9 10−12
The average gaming FPS of Iris Pro Graphics 580 in Assassin's Creed Odyssey is 22% more, than GeForce GTX 660M.

Full Specs

  GeForce GTX 660M Iris Pro Graphics 580
Architecture Kepler Gen. 9 Skylake
Code name N13E-GE Skylake GT4e
Type Laptop Laptop
Release date 22 March 2012 1 September 2015
Pipelines 384 72
Core clock speed 835 MHz 350 MHz
Boost Clock 950 MHz 1050 MHz
Transistor count 1,270 million 189 million
Manufacturing process technology 28 nm 14 nm
Texture fill rate 30.4 billion/sec 72.00
Floating-point performance 729.6 gflops
Memory bus width 128bit
Memory clock speed 2000 MHz
Memory bandwidth 64.0 GB/s
Shared memory - +
DirectX 12 API 12 (12_1)
Shader Model 5.1 6.4
OpenGL 4.5 4.6
OpenCL 1.1 2.1
Vulkan 1.1.126 1.1.97
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 +
Quick Sync +
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