GeForce GT 640M LE vs Radeon HD 6790

If you are going to buy a new graphics card and are choosing between GeForce GT 640M LE and Radeon HD 6790, 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 LE stacks up against Radeon HD 6790, check out specs charts below.

GeForce GT 640M LE is a Laptop Graphics Card

Note: GeForce GT 640M LE 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 GT 640M LE here:

Main Specs

  GeForce GT 640M LE Radeon HD 6790
Power consumption (TDP) 20 Watt 150 Watt
Interface PCIe 2.0 x16 PCIe 2.0 x16
Supplementary power connectors 2x 6-pin
Memory type DDR3\DDR5 GDDR5
Maximum RAM amount 2 GB 1 GB
Display Connectors No outputs 2x DVI, 1x HDMI, 1x DisplayPort
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  • Radeon HD 6790 has 650% more power consumption, than GeForce GT 640M LE.
  • Both video cards are using PCIe 2.0 x16 interface connection to a motherboard.
  • GeForce GT 640M LE has 1 GB more memory, than Radeon HD 6790.
  • GeForce GT 640M LE is used in Laptops, and Radeon HD 6790 - in Desktops.
  • GeForce GT 640M LE is build with Fermi / Kepler architecture, and Radeon HD 6790 - with Terascale 2.
  • GeForce GT 640M LE is manufactured by 28 nm process technology, and Radeon HD 6790 - by 40 nm process technology.
  • Memory clock speed of GeForce GT 640M LE is 750 MHz higher, than Radeon HD 6790.

Game benchmarks

high / 1080p 0−1 7−8
ultra / 1080p 4−5
QHD / 1440p 0−1 0−1
low / 720p 1−2 18−20
medium / 1080p 0−1 9−10
The average gaming FPS of Radeon HD 6790 in Assassin's Creed Odyssey is 1800% more, than GeForce GT 640M LE.

Full Specs

  GeForce GT 640M LE Radeon HD 6790
Architecture Fermi / Kepler Terascale 2
Code name N13P-LP Barts
Type Laptop Desktop
Release date 22 March 2012 4 April 2011
Pipelines 384 800
Core clock speed 840 MHz
Transistor count 585 million 1,700 million
Manufacturing process technology 28 nm 40 nm
Texture fill rate 33.60
Floating-point performance 384.0 gflops 1,344.0 gflops
Length 198 mm
Memory bus width 128bit 256 Bit
Memory clock speed 1800 - 4000 MHz 1050 MHz
Memory bandwidth 134.4 GB/s
Shared memory -
DirectX 12 API 11.2 (11_0)
Shader Model 5.1 5.0
OpenGL 4.5 4.4
OpenCL 1.1 1.2
Vulkan N/A N/A
CUDA +
CUDA cores Up to 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) 14 Mh/s 122 Mh/s
Laptop size medium sized
Optimus +
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