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Differences What are the advantages of each

Front view of Radeon R9 390

Reasons to consider the
AMD Radeon R9 390

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More memory 8,192 MB vs 4,096 MB 2x more memory
Significantly better floating-point performance 5,120 GFLOPS vs 1,536 GFLOPS More than 3.2x better floating-point performance
Significantly higher pixel rate 64 GPixel/s vs 16 GPixel/s 4x higher pixel rate
Significantly higher texture rate 160 GTexel/s vs 48 GTexel/s More than 3.2x higher texture rate
Many more render output processors 64 vs 16 48 more render output processors
Significantly more shading units 2,560 vs 768 1792 more shading units
Significantly more texture mapping units 160 vs 48 112 more texture mapping units
Significantly more compute units 40 vs 12 28 more compute units
Wider memory bus 512 bit vs 128 bit 4x wider memory bus
Front view of Radeon E8870

Reasons to consider the
AMD Radeon E8870

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Much lower TDP 75W vs 275W 3.7x lower TDP

Features Key features of the Radeon R9 390  vs E8870 

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

Radeon R9 390
64 GPixel/s
Radeon E8870
16 GPixel/s

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

Radeon R9 390
160 GTexel/s
Radeon E8870
48 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R9 390
5,120 GFLOPS
Radeon E8870
1,536 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

compute units Discrete cores within the GPU

Specifications Full list of technical specs

gpu

Radeon R9 390  vs
E8870 
GPU brand AMD AMD
GPU name Grenada Saturn
Market Desktop Laptop
Clock speed 1,000 MHz 1,000 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 2,560 768
Texture mapping units 160 48
Render output processors 64 16
Compute units 40 12
Pixel rate 64 GPixel/s 16 GPixel/s
Texture rate 160 GTexel/s 48 GTexel/s
Floating-point performance 5,120 GFLOPS 1,536 GFLOPS

memory

Radeon R9 390  vs
E8870 
Memory clock speed 1,500 MHz 1,500 MHz
Effective memory clock speed 6,000 MHz 6,000 MHz
Memory bus 512 bit 128 bit
Memory 8,192 MB 4,096 MB
Memory type GDDR5 GDDR5

noise and power

TDP 275W 75W

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