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Differences What are the advantages of each

Front view of Radeon HD 8670D IGP

Reasons to consider the
IGP Radeon HD 8670D IGP

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Slightly more texture mapping units 24 vs 16 8 more texture mapping units
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Higher clock speed 1,029 MHz vs 844 MHz More than 20% higher clock speed
Higher turbo clock speed 1,124 MHz vs 950 MHz Around 20% higher turbo clock speed
Lower TDP 33W vs 100W 3x lower TDP

Features Key features of the Radeon HD 8670D IGP  vs GeForce 840M 

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

Radeon HD 8670D IGP
6.75 GPixel/s
GeForce 840M
8.23 GPixel/s

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

Radeon HD 8670D IGP
20.3 GTexel/s
GeForce 840M
16.46 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8670D IGP
648.2 GFLOPS
GeForce 840M
790.3 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 8670D IGP  vs
GeForce 840M 
GPU brand AMD Nvidia
GPU name Devastator GM108
Clock speed 844 MHz 1,029 MHz
Turbo clock speed 950 MHz 1,124 MHz
Is dual GPU No No
Reference card None None

noise and power

TDP 100W 33W

raw performance

Radeon HD 8670D IGP  vs
GeForce 840M 
Shading units 384 384
Texture mapping units 24 16
Render output processors 8 8
Pixel rate 6.75 GPixel/s 8.23 GPixel/s
Texture rate 20.3 GTexel/s 16.46 GTexel/s
Floating-point performance 648.2 GFLOPS 790.3 GFLOPS

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