GeForce GT 640M vs Quadro K620M

If you are going to buy a new graphics card and are choosing between GeForce GT 640M and Quadro K620M, 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 GT 640M stacks up against Quadro K620M, check out specs charts below.

GeForce GT 640M and Quadro K620M are Laptop Graphics Cards

Note: GeForce GT 640M and Quadro K620M are only used in laptop graphics. They have 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 GT 640M or Quadro K620M here:

Main Specs

  GeForce GT 640M Quadro K620M
Power consumption (TDP) 32 Watt 30 Watt
Interface PCIe 3.0 x16 MXM-A (3.0)
Supplementary power connectors None
Memory type DDR3\GDDR5 DDR3
Maximum RAM amount 2 GB 2 GB
Display Connectors No outputs No outputs
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  • GeForce GT 640M has 6% more power consumption, than Quadro K620M.
  • GeForce GT 640M is connected by PCIe 3.0 x16, and Quadro K620M uses MXM-A (3.0) interface.
  • GeForce GT 640M and Quadro K620M have maximum RAM of 2 GB.
  • GeForce GT 640M is used in Laptops, and Quadro K620M - in Mobile workstations.
  • GeForce GT 640M is build with Kepler architecture, and Quadro K620M - with Maxwell.
  • GeForce GT 640M and Quadro K620M are manufactured by 28 nm process technology.
  • Memory clock speed of Quadro K620M is 200 MHz higher, than GeForce GT 640M.

Game benchmarks

high / 1080p 0−1 3−4
ultra / 1080p 0−1 1−2
QHD / 1440p 0−1 0−1
low / 720p 10−12 14−16
medium / 1080p 2−3 5−6
The average gaming FPS of Quadro K620M in Assassin's Creed Odyssey is 66% more, than GeForce GT 640M.

Full Specs

  GeForce GT 640M Quadro K620M
Architecture Kepler Maxwell
Code name N13P-GS GM108
Type Laptop Mobile workstation
Release date 22 March 2012 1 March 2015
Pipelines 384 384
Core clock speed 1029 MHz
Boost Clock 645 MHz 1124 MHz
Transistor count 1,270 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 17.98
Floating-point performance 480.0 gflops 863.2 gflops
Memory bus width 128bit 64 Bit
Memory clock speed 1800 - 4000 MHz 2000 MHz
Memory bandwidth 14.4 GB/s
Shared memory - -
DirectX 12 API 12
Shader Model 5.1 5
OpenGL 4.5 4.5
OpenCL 1.1 1.2
Vulkan 1.1.126 1.1.126
CUDA + +
CUDA cores 384
Bus support PCI Express 2.0, PCI Express 3.0
HDMI +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 18 Mh/s 92 Mh/s
Laptop size medium sized
Optimus + +
Display Port 1.2
nView Display Management +
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