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Differences What are the advantages of each

Front view of Radeon HD 2400

Reasons to consider the
ATi Radeon HD 2400

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GPUBoss is not aware of any important advantages of the ATi Radeon HD 2400 vs the Nvidia GeForce GT 320M.

Front view of GeForce GT 320M

Reasons to consider the
Nvidia GeForce GT 320M

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Higher clock speed 500 MHz vs 398 MHz More than 25% higher clock speed
More memory 1,024 MB vs 256 MB 4x more memory
Higher effective memory clock speed 1,580 MHz vs 990 MHz Around 60% higher effective memory clock speed
Higher memory clock speed 790 MHz vs 495 MHz Around 60% higher memory clock speed
Wider memory bus 128 bit vs 64 bit 2x wider memory bus

Benchmarks Real world tests of Radeon HD 2400 vs GeForce GT 320M

Passmark Industry standard benchmark for overall graphics card performance

Features Key features of the Radeon HD 2400  vs GeForce GT 320M 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 2400
7.92 GB/s
GeForce GT 320M
25.3 GB/s
The RAM and core are connected via a 256-bit interface.
GeForce GT 320M | by Trace-Hagan (May, 2013)

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 2400
1.59 GPixel/s
GeForce GT 320M
4 GPixel/s
Nvidia has launched the GeForce 320.14 Beta Drivers that provide up to 10 percent better performance in Metro: Last Light and improvements of up to 20 percent for a range of other titles when compared to the GeForce 314.22 WHQL drivers.
GeForce GT 320M | by Tarun-Iyer (May, 2013)

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 2400
1.59 GTexel/s
GeForce GT 320M
4 GTexel/s
Dual Cards will drain your laptop battery in no time, but a single card offering only slightly less performance would definitely be the way to go.
GeForce GT 320M | by Syed-Muhammad-Usman-Pirzada (Dec, 2013)

floating point performance How fast the gpu can crunch numbers

Radeon HD 2400
31.84 GFLOPS
GeForce GT 320M
52.8 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

However, it does include advanced features like DirectX 10 and Shader Model 4.0 which are probably not going to be used a lot in this performance class.
Radeon HD 2400 | by techPowerUp! (Jun, 2007)

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

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