GeForce GTX 660M vs Radeon HD 6870

When choosing between GeForce GTX 660M and Radeon HD 6870, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between GeForce GTX 660M and Radeon HD 6870.

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 HD 6870
Power consumption (TDP) 50 Watt 151 Watt
Interface MXM-B (3.0) PCIe 2.0 x16
Supplementary power connectors 2x 6-pin
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 1 GB
Display Connectors No outputs 2x DVI, 1x HDMI, 2x mini-DisplayPort
  Check Price Check Price
  • Radeon HD 6870 has 202% more power consumption, than GeForce GTX 660M.
  • GeForce GTX 660M is connected by MXM-B (3.0), and Radeon HD 6870 uses PCIe 2.0 x16 interface.
  • GeForce GTX 660M has 1 GB more memory, than Radeon HD 6870.
  • GeForce GTX 660M is used in Laptops, and Radeon HD 6870 - in Desktops.
  • GeForce GTX 660M is build with Kepler architecture, and Radeon HD 6870 - with Terascale 2.
  • GeForce GTX 660M is manufactured by 28 nm process technology, and Radeon HD 6870 - by 40 nm process technology.
  • Memory clock speed of GeForce GTX 660M is 950 MHz higher, than Radeon HD 6870.

Game benchmarks

high / 1080p 6−7 10−12
ultra / 1080p 4−5 6−7
QHD / 1440p 0−1 1−2
low / 720p 16−18 24−27
medium / 1080p 8−9 12−14
The average gaming FPS of Radeon HD 6870 in Assassin's Creed Odyssey is 55% more, than GeForce GTX 660M.

Full Specs

  GeForce GTX 660M Radeon HD 6870
Architecture Kepler Terascale 2
Code name N13E-GE RV940 Barts
Type Laptop Desktop
Release date 22 March 2012 22 October 2010
Pipelines 384 1120
Core clock speed 835 MHz
Boost Clock 950 MHz 900 MHz
Transistor count 1,270 million 1,700 million
Manufacturing process technology 28 nm 40 nm
Texture fill rate 30.4 billion/sec 50.40
Floating-point performance 729.6 gflops 2,016.0 gflops
Length 220 mm
Memory bus width 128bit 256 Bit
Memory clock speed 2000 MHz 1050 MHz
Memory bandwidth 64.0 GB/s 134.4 GB/s
Shared memory - -
DirectX 12 API
Shader Model 5.1 5.0
OpenGL 4.5 4.4
OpenCL 1.1 1.2
Vulkan 1.1.126
CUDA +
CUDA cores 384
Bus support PCI Express 2.0, PCI Express 3.0 PCIe 2.0 x16
SLI options +
HDMI + +
HDCP +
Maximum VGA resolution Up to 2048x1536
Bitcoin / BTC (SHA256) 36 Mh/s 213 Mh/s
Laptop size large
Optimus +
Eyefinity +
Design reference
CrossFire +
  Check Price Check Price