GeForce GTX 660 vs GeForce GTX 860M SLI

In this comparison between GeForce GTX 660 and GeForce GTX 860M SLI 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 GTX 660 will be the best choice, for others GeForce GTX 860M SLI will be their preference. Study the comparison tables below and make your choice.

GeForce GTX 860M SLI is a Laptop Graphics Card

Note: GeForce GTX 860M SLI 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 860M SLI here:

Main Specs

  GeForce GTX 660 GeForce GTX 860M SLI
Power consumption (TDP) 140 Watt 120 Watt
Interface PCIe 3.0 x16
Supplementary power connectors One 6-pin
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 2x 4 GB
Display Connectors 2x DVI, 1x HDMI, 1x DisplayPort
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  • GeForce GTX 660 has 16% more power consumption, than GeForce GTX 860M SLI.
  • GeForce GTX 660 and GeForce GTX 860M SLI have maximum RAM of 2 GB.
  • GeForce GTX 660 is used in Desktops, and GeForce GTX 860M SLI - in Laptops.
  • GeForce GTX 660 is build with Kepler architecture, and GeForce GTX 860M SLI - with Maxwell.
  • Core clock speed of GeForce GTX 860M SLI is 49 MHz higher, than GeForce GTX 660.
  • GeForce GTX 660 and GeForce GTX 860M SLI are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce GTX 860M SLI is 4994 MHz higher, than GeForce GTX 660.

Game benchmarks

high / 1080p 20−22 21−24
ultra / 1080p 12−14 14−16
QHD / 1440p 6−7 8−9
4K / 2160p 5−6 5−6
low / 720p 40−45 40−45
medium / 1080p 24−27 27−30
The average gaming FPS of GeForce GTX 860M SLI in Assassin's Creed Odyssey is 5% more, than GeForce GTX 660.

Full Specs

  GeForce GTX 660 GeForce GTX 860M SLI
Architecture Kepler Maxwell
Code name GK106
Type Desktop Laptop
Release date 6 September 2012 12 March 2014
Pipelines 960 1280
Core clock speed 980 MHz 1029 MHz
Boost Clock 1033 MHz
Transistor count 2,540 million 2x 1870 Million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 78.4 billion/sec
Floating-point performance 1,981 gflops
Length 9.5" (24.1 cm)
Memory bus width 192-bit GDDR5 2x 128 Bit
Memory clock speed 6.0 GB/s 5000 MHz
Memory bandwidth 144.2 GB/s
Shared memory -
DirectX 12 (11_0) DirectX 12 (FL 11_0), Shader 5.0
Shader Model 5.1
OpenGL 4.3
OpenCL 1.2
Vulkan 1.1.126
CUDA + +
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
Optimus +
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