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Differences What are the advantages of each

Front view of Radeon R9 280X

Reasons to consider the
Generic Radeon R9 280X

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Significantly higher memory bandwidth 288 GB/s vs 192 GB/s 50% higher memory bandwidth
More memory 3,072 MB vs 2,048 MB 50% more memory
Wider memory bus 384 bit vs 256 bit 50% wider memory bus
Front view of Radeon HD 8870

Reasons to consider the
AMD Radeon HD 8870

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Slightly higher clock speed 925 MHz vs 850 MHz Around 10% higher clock speed
Lower TDP 185W vs 250W More than 25% lower TDP

Features Key features of the Radeon R9 280X  vs HD 8870 

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

Radeon R9 280X
288 GB/s
Radeon HD 8870
192 GB/s

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

Radeon R9 280X
32 GPixel/s
Radeon HD 8870
29.6 GPixel/s

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

Radeon R9 280X
128 GTexel/s
Radeon HD 8870
118.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R9 280X
4,096 GFLOPS
Radeon HD 8870
3,789 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 280X  vs
HD 8870 
GPU brand AMD AMD
GPU name Tahiti Hainan XT
Market Desktop Desktop
Clock speed 850 MHz 925 MHz
Turbo clock speed 1,000 MHz 975 MHz
Is dual GPU No No
Reference card AMD Radeon R9 280X 850 MHz 3 GB None

raw performance

Shading units 2,048 2,048
Texture mapping units 128 128
Render output processors 32 32
Compute units 32 32
Pixel rate 32 GPixel/s 29.6 GPixel/s
Texture rate 128 GTexel/s 118.4 GTexel/s
Floating-point performance 4,096 GFLOPS 3,789 GFLOPS

memory

Radeon R9 280X  vs
HD 8870 
Memory clock speed 1,500 MHz 1,500 MHz
Effective memory clock speed 6,000 MHz 6,000 MHz
Memory bus 384 bit 256 bit
Memory 3,072 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 288 GB/s 192 GB/s

noise and power

TDP 250W 185W

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