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Differences What are the advantages of each

Front view of Radeon R9 M395 Mac

Reasons to consider the
AMD Radeon R9 M395 Mac

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Higher clock speed 909 MHz vs 680 MHz Around 35% higher clock speed
Higher effective memory clock speed 5,460 MHz vs 3,600 MHz More than 50% higher effective memory clock speed
More memory 4,096 MB vs 2,048 MB 2x more memory
Better floating-point performance 3,258 GFLOPS vs 1,305.6 GFLOPS Around 2.5x better floating-point performance
Higher memory bandwidth 174.7 GB/s vs 115.2 GB/s More than 50% higher memory bandwidth
Higher texture rate 101.8 GTexel/s vs 32.6 GTexel/s More than 3x higher texture rate
More texture mapping units 112 vs 48 64 more texture mapping units
More shading units 1,792 vs 960 832 more shading units
More compute units 28 vs 12 16 more compute units
Significantly higher memory clock speed 1,365 MHz vs 900 MHz More than 50% higher memory clock speed
Front view of Radeon HD 6970M Mac

Reasons to consider the
AMD Radeon HD 6970M Mac

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Much lower TDP 75W vs 250W 3.3x lower TDP

Features Key features of the Radeon R9 M395 Mac  vs HD 6970M Mac 

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

Radeon R9 M395 Mac
174.7 GB/s
Radeon HD 6970M Mac
115.2 GB/s

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

Radeon R9 M395 Mac
29.09 GPixel/s
Radeon HD 6970M Mac
21.76 GPixel/s

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

Radeon R9 M395 Mac
101.8 GTexel/s
Radeon HD 6970M Mac
32.6 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R9 M395 Mac
3,258 GFLOPS
Radeon HD 6970M Mac
1,305.6 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 R9 M395 Mac  vs
HD 6970M Mac 
GPU brand AMD AMD
GPU name Grenada Blackcomb
Clock speed 909 MHz 680 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,792 960
Texture mapping units 112 48
Render output processors 32 32
Compute units 28 12
Pixel rate 29.09 GPixel/s 21.76 GPixel/s
Texture rate 101.8 GTexel/s 32.6 GTexel/s
Floating-point performance 3,258 GFLOPS 1,305.6 GFLOPS

memory

Radeon R9 M395 Mac  vs
HD 6970M Mac 
Memory clock speed 1,365 MHz 900 MHz
Effective memory clock speed 5,460 MHz 3,600 MHz
Memory bus 256 bit 256 bit
Memory 4,096 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 174.7 GB/s 115.2 GB/s

noise and power

TDP 250W 75W

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