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Differences What are the advantages of each

Front view of Radeon HD 8490

Reasons to consider the
AMD Radeon HD 8490

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Significantly higher clock speed 875 MHz vs 400 MHz Around 2.2x higher clock speed
Front view of GeForce 8200M G mGPU

Reasons to consider the
Nvidia GeForce 8200M G mGPU

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Slightly lower TDP 12W vs 35W 2.9x lower TDP

Features Key features of the Radeon HD 8490  vs GeForce 8200M G mGPU 

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

Radeon HD 8490
3.5 GPixel/s
GeForce 8200M G mGPU
1.6 GPixel/s

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

Radeon HD 8490
7 GTexel/s
GeForce 8200M G mGPU
1.6 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8490
280 GFLOPS
GeForce 8200M G mGPU
12.8 GFLOPS

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

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

render output processors GPU commponents responsible for transform pixels as they flow between memory buffers

Specifications Full list of technical specs

gpu

Radeon HD 8490  vs
GeForce 8200M G mGPU 
GPU brand AMD Nvidia
GPU name Caicos XTX MCP77MV
Clock speed 875 MHz 400 MHz
Is dual GPU No No
Reference card None None

noise and power

TDP 35W 12W

raw performance

Radeon HD 8490  vs
GeForce 8200M G mGPU 
Shading units 160 8
Texture mapping units 8 4
Render output processors 4 4
Pixel rate 3.5 GPixel/s 1.6 GPixel/s
Texture rate 7 GTexel/s 1.6 GTexel/s
Floating-point performance 280 GFLOPS 12.8 GFLOPS

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