GeForce 820A vs GeForce GTX 660M

Find out if it is worth upgrading your current GPU setup by comparing GeForce 820A and GeForce GTX 660M. 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 820A and GeForce GTX 660M. 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 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 820A GeForce GTX 660M
Power consumption (TDP) 15 Watt 50 Watt
Interface PCIe 2.0 x16 MXM-B (3.0)
Memory type DDR3 GDDR5
Maximum RAM amount 1 GB 2 GB
Display Connectors No outputs No outputs
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  • GeForce GTX 660M has 233% more power consumption, than GeForce 820A.
  • GeForce 820A is connected by PCIe 2.0 x16, and GeForce GTX 660M uses MXM-B (3.0) interface.
  • GeForce GTX 660M has 1 GB more memory, than GeForce 820A.
  • GeForce 820A is used in Desktops, and GeForce GTX 660M - in Laptops.
  • GeForce 820A is build with Fermi 2.0 architecture, and GeForce GTX 660M - with Kepler.
  • Core clock speed of GeForce GTX 660M is 60 MHz higher, than GeForce 820A.
  • GeForce 820A and GeForce GTX 660M are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce GTX 660M is 200 MHz higher, than GeForce 820A.

Game benchmarks

high / 1080p 0−1 6−7
ultra / 1080p 4−5
QHD / 1440p 0−1 0−1
low / 720p 1−2 16−18
medium / 1080p 0−1 8−9
The average gaming FPS of GeForce GTX 660M in Assassin's Creed Odyssey is 1600% more, than GeForce 820A.

Full Specs

  GeForce 820A GeForce GTX 660M
Architecture Fermi 2.0 Kepler
Code name GF117 N13E-GE
Type Desktop Laptop
Release date 17 March 2014 22 March 2012
Pipelines 96 384
Core clock speed 775 MHz 835 MHz
Boost Clock 950 MHz
Transistor count 585 million 1,270 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 12.40 30.4 billion/sec
Floating-point performance 297.6 gflops 729.6 gflops
Memory bus width 64 Bit 128bit
Memory clock speed 1800 MHz 2000 MHz
Memory bandwidth 14.4 GB/s 64.0 GB/s
Shared memory -
DirectX 12 (11_0) 12 API
Shader Model 5.1 5.1
OpenGL 4.6 4.5
OpenCL 1.1 1.1
Vulkan N/A 1.1.126
CUDA 2.1 +
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 +
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