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Differences What are the advantages of each

Front view of Radeon R5 M445

Reasons to consider the
AMD Radeon R5 M445

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Slightly higher clock speed 900 MHz vs 825 MHz Around 10% higher clock speed
Front view of Radeon HD 3870 X2

Reasons to consider the
ATi Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher memory bandwidth 115.32 GB/s vs 14.4 GB/s More than 8x higher memory bandwidth
Higher pixel rate 26.4 GPixel/s vs 7.2 GPixel/s Around 3.8x higher pixel rate
More render output processors 32 vs 8 24 more render output processors
Wider memory bus 512 bit vs 64 bit 8x wider memory bus

Features Key features of the Radeon R5 M445  vs HD 3870 X2 

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

Radeon R5 M445
14.4 GB/s
Radeon HD 3870 X2
115.32 GB/s

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

Radeon R5 M445
7.2 GPixel/s
Radeon HD 3870 X2
26.4 GPixel/s

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

Radeon R5 M445
21.6 GTexel/s
Radeon HD 3870 X2
26.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R5 M445
691.2 GFLOPS
Radeon HD 3870 X2
1,056 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

Specifications Full list of technical specs

gpu

Radeon R5 M445  vs
HD 3870 X2 
GPU brand AMD ATI
GPU name Meso R680
Clock speed 900 MHz 825 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 384 640
Texture mapping units 24 32
Render output processors 8 32
Compute units 6 8
Pixel rate 7.2 GPixel/s 26.4 GPixel/s
Texture rate 21.6 GTexel/s 26.4 GTexel/s
Floating-point performance 691.2 GFLOPS 1,056 GFLOPS

memory

Radeon R5 M445  vs
HD 3870 X2 
Memory clock speed 900 MHz 901 MHz
Effective memory clock speed 1,800 MHz 1,802 MHz
Memory bus 64 bit 512 bit
Memory 1,024 MB 1,024 MB
Memory type DDR3 GDDR3
Memory bandwidth 14.4 GB/s 115.32 GB/s

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