GeForce 840A vs GeForce GTX 660

When choosing between GeForce 840A and GeForce GTX 660, 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 840A and GeForce GTX 660.

Main Specs

  GeForce 840A GeForce GTX 660
Power consumption (TDP) 33 Watt 140 Watt
Interface PCIe 3.0 x8 PCIe 3.0 x16
Supplementary power connectors One 6-pin
Memory type DDR3 GDDR5
Maximum RAM amount 2 GB 2 GB
Display Connectors No outputs 2x DVI, 1x HDMI, 1x DisplayPort
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  • GeForce GTX 660 has 324% more power consumption, than GeForce 840A.
  • GeForce 840A is connected by PCIe 3.0 x8, and GeForce GTX 660 uses PCIe 3.0 x16 interface.
  • GeForce 840A and GeForce GTX 660 have maximum RAM of 2 GB.
  • Both cards are used in Desktops.
  • GeForce 840A is build with Maxwell architecture, and GeForce GTX 660 - with Kepler.
  • Core clock speed of GeForce 840A is 49 MHz higher, than GeForce GTX 660.
  • GeForce 840A and GeForce GTX 660 are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce 840A is 1996 MHz higher, than GeForce GTX 660.

Game benchmarks

high / 1080p 3−4 20−22
ultra / 1080p 2−3 12−14
QHD / 1440p 0−1 6−7
4K / 2160p 5−6
low / 720p 14−16 40−45
medium / 1080p 5−6 24−27
The average gaming FPS of GeForce GTX 660 in Assassin's Creed Odyssey is 316% more, than GeForce 840A.

Full Specs

  GeForce 840A GeForce GTX 660
Architecture Maxwell Kepler
Code name GM108 GK106
Type Desktop Desktop
Release date 17 March 2014 6 September 2012
Pipelines 384 960
Core clock speed 1029 MHz 980 MHz
Boost Clock 1124 MHz 1033 MHz
Transistor count 2,540 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 17.98 78.4 billion/sec
Floating-point performance 863.2 gflops 1,981 gflops
Length 9.5" (24.1 cm)
Memory bus width 64 Bit 192-bit GDDR5
Memory clock speed 2002 MHz 6.0 GB/s
Memory bandwidth 16.02 GB/s 144.2 GB/s
DirectX 12 (11_0) 12 (11_0)
Shader Model 5.1 5.1
OpenGL 4.6 4.3
OpenCL 1.2 1.2
Vulkan 1.1.126 1.1.126
CUDA 5.0 +
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
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