GeForce GTX 660M vs Radeon HD 4850 X2

When choosing between GeForce GTX 660M and Radeon HD 4850 X2, 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 GTX 660M and Radeon HD 4850 X2.

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 GTX 660M Radeon HD 4850 X2
Power consumption (TDP) 50 Watt 250 Watt
Interface MXM-B (3.0) PCIe 2.0 x16
Supplementary power connectors 1x 6-pin + 1x 8-pin
Memory type GDDR5 GDDR3
Maximum RAM amount 2 GB 512 MB
Display Connectors No outputs 4x DVI, 1x S-Video
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  • Radeon HD 4850 X2 has 400% more power consumption, than GeForce GTX 660M.
  • GeForce GTX 660M is connected by MXM-B (3.0), and Radeon HD 4850 X2 uses PCIe 2.0 x16 interface.
  • Radeon HD 4850 X2 has 510 GB more memory, than GeForce GTX 660M.
  • GeForce GTX 660M is used in Laptops, and Radeon HD 4850 X2 - in Desktops.
  • GeForce GTX 660M is build with Kepler architecture, and Radeon HD 4850 X2 - with TeraScale.
  • Core clock speed of GeForce GTX 660M is 210 MHz higher, than Radeon HD 4850 X2.
  • GeForce GTX 660M is manufactured by 28 nm process technology, and Radeon HD 4850 X2 - by 55 nm process technology.
  • Memory clock speed of GeForce GTX 660M is 10 MHz higher, than Radeon HD 4850 X2.

Game benchmarks

high / 1080p 6−7 3−4
ultra / 1080p 4−5 2−3
QHD / 1440p 0−1 0−1
low / 720p 16−18 14−16
medium / 1080p 8−9 5−6
The average gaming FPS of GeForce GTX 660M in Assassin's Creed Odyssey is 50% more, than Radeon HD 4850 X2.

Full Specs

  GeForce GTX 660M Radeon HD 4850 X2
Architecture Kepler TeraScale
Code name N13E-GE R700
Type Laptop Desktop
Release date 22 March 2012 7 November 2008
Pipelines 384 800
Core clock speed 835 MHz 625 MHz
Boost Clock 950 MHz
Transistor count 1,270 million 956 million
Manufacturing process technology 28 nm 55 nm
Texture fill rate 30.4 billion/sec 25.00
Floating-point performance 729.6 gflops 2x 1,000.0 gflops
Length 267 mm
Memory bus width 128bit 256 Bit
Memory clock speed 2000 MHz 1990 MHz
Memory bandwidth 64.0 GB/s 63.68 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
SLI options +
HDMI +
HDCP +
Maximum VGA resolution Up to 2048x1536
Bitcoin / BTC (SHA256) 36 Mh/s
Laptop size large
Optimus +
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