GeForce GTX 660 vs GeForce GTX 870M

If you are going to buy a new graphics card and are choosing between GeForce GTX 660 and GeForce GTX 870M, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce GTX 660 stacks up against GeForce GTX 870M, check out specs charts below.

GeForce GTX 870M is a Laptop Graphics Card

Note: GeForce GTX 870M 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 870M here:

Main Specs

  GeForce GTX 660 GeForce GTX 870M
Power consumption (TDP) 140 Watt 100 Watt
Interface PCIe 3.0 x16 MXM-B (3.0)
Supplementary power connectors One 6-pin None
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 6 GB
Display Connectors 2x DVI, 1x HDMI, 1x DisplayPort No outputs
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  • GeForce GTX 660 has 40% more power consumption, than GeForce GTX 870M.
  • GeForce GTX 660 is connected by PCIe 3.0 x16, and GeForce GTX 870M uses MXM-B (3.0) interface.
  • GeForce GTX 870M has 4 GB more memory, than GeForce GTX 660.
  • GeForce GTX 660 is used in Desktops, and GeForce GTX 870M - in Laptops.
  • GeForce GTX 660 and GeForce GTX 870M are build with Kepler architecture.
  • Core clock speed of GeForce GTX 660 is 39 MHz higher, than GeForce GTX 870M.
  • GeForce GTX 660 and GeForce GTX 870M are manufactured by 28 nm process technology.

Game benchmarks

high / 1080p 20−22 16−18
ultra / 1080p 12−14 10−11
QHD / 1440p 6−7 4−5
4K / 2160p 5−6
low / 720p 40−45 35−40
medium / 1080p 24−27 21−24
The average gaming FPS of GeForce GTX 660 in Assassin's Creed Odyssey is 16% more, than GeForce GTX 870M.

Full Specs

  GeForce GTX 660 GeForce GTX 870M
Architecture Kepler Kepler
Code name GK106 N15P-GT
Type Desktop Laptop
Release date 6 September 2012 12 March 2014
Pipelines 960 1344
Core clock speed 980 MHz 941 MHz
Boost Clock 1033 MHz 967 MHz
Transistor count 2,540 million 3,540 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 78.4 billion/sec 108.3
Floating-point performance 1,981 gflops 2,599 gflops
Length 9.5" (24.1 cm)
Memory bus width 192-bit GDDR5 192 Bit
Memory clock speed 6.0 GB/s
Memory bandwidth 144.2 GB/s 120.0 GB/s
Shared memory -
DirectX 12 (11_0) 12 (11_0)
Shader Model 5.1 5.1
OpenGL 4.3 4.5
OpenCL 1.2 1.1
Vulkan 1.1.126 1.1.126
CUDA + +
CUDA cores 960 1344
Bus support PCI Express 3.0 PCI Express 2.0, 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 82 Mh/s
Laptop size large
Standard memory configuration GDDR5
eDP 1.2 signal support Up to 3840x2160
LVDS signal support Up to 1920x1200
DisplayPort Multimode (DP++) support Up to 3840x2160
HDCP content protection +
7.1 channel HD audio on HDMI +
TrueHD and DTS-HD audio bitstreaming +
H.264, VC1, MPEG2 1080p video decoder +
Optimus +
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