GeForce GT 640M vs Radeon HD 4890

When choosing between GeForce GT 640M and Radeon HD 4890, 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 GT 640M and Radeon HD 4890.

GeForce GT 640M is a Laptop Graphics Card

Note: GeForce GT 640M 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 here:

Main Specs

  GeForce GT 640M Radeon HD 4890
Power consumption (TDP) 32 Watt 190 Watt
Interface PCIe 3.0 x16 PCIe 2.0 x16
Supplementary power connectors 2x 6-pin
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 1 GB
Display Connectors No outputs 2x DVI, 1x S-Video
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  • Radeon HD 4890 has 493% more power consumption, than GeForce GT 640M.
  • GeForce GT 640M is connected by PCIe 3.0 x16, and Radeon HD 4890 uses PCIe 2.0 x16 interface.
  • GeForce GT 640M has 1 GB more memory, than Radeon HD 4890.
  • GeForce GT 640M is used in Laptops, and Radeon HD 4890 - in Desktops.
  • GeForce GT 640M is build with Kepler architecture, and Radeon HD 4890 - with TeraScale.
  • GeForce GT 640M is manufactured by 28 nm process technology, and Radeon HD 4890 - by 55 nm process technology.
  • Memory clock speed of Radeon HD 4890 is 2100 MHz higher, than GeForce GT 640M.

Game benchmarks

high / 1080p 0−1 7−8
ultra / 1080p 0−1 4−5
QHD / 1440p 0−1 0−1
low / 720p 10−12 16−18
medium / 1080p 2−3 8−9
The average gaming FPS of Radeon HD 4890 in Assassin's Creed Odyssey is 100% more, than GeForce GT 640M.

Full Specs

  GeForce GT 640M Radeon HD 4890
Architecture Kepler TeraScale
Code name N13P-GS RV790
Type Laptop Desktop
Release date 22 March 2012 2 April 2009
Pipelines 384 800
Core clock speed 850 MHz
Boost Clock 645 MHz
Transistor count 1,270 million 959 million
Manufacturing process technology 28 nm 55 nm
Texture fill rate 34.00
Floating-point performance 480.0 gflops 1,360.0 gflops
Length 241 mm
Memory bus width 128bit 256 Bit
Memory clock speed 1800 - 4000 MHz 3900 MHz
Memory bandwidth 124.8 GB/s
Shared memory -
DirectX 12 API 10.1 (10_1)
Shader Model 5.1 4.1
OpenGL 4.5 3.3
OpenCL 1.1 1.1
Vulkan 1.1.126 N/A
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
Laptop size medium sized
Optimus +
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