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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 effective memory clock speed 6,000 MHz vs 4,200 MHz Around 45% higher effective memory clock speed
More memory 3,072 MB vs 2,048 MB 50% more memory
Higher memory bandwidth 288 GB/s vs 268.8 GB/s More than 5% higher memory bandwidth
Higher texture rate 128 GTexel/s vs 100.8 GTexel/s More than 25% higher texture rate
Significantly higher memory clock speed 1,500 MHz vs 1,050 MHz Around 45% higher memory clock speed
More texture mapping units 128 vs 112 16 more texture mapping units
Slightly more compute units 32 vs 28 4 more compute units
Lower TDP 250W vs 300W More than 15% lower TDP
Front view of Radeon HD 6870 X2

Reasons to consider the
AMD Radeon HD 6870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher pixel rate 57.6 GPixel/s vs 32 GPixel/s 80% higher pixel rate
Significantly more render output processors 64 vs 32 Twice as many render output processors
Wider memory bus 512 bit vs 384 bit Around 35% wider memory bus
Slightly more shading units 2,240 vs 2,048 192 more shading units

Features Key features of the Radeon R9 280X  vs HD 6870 X2 

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

Radeon R9 280X
288 GB/s
Radeon HD 6870 X2
268.8 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 6870 X2
57.6 GPixel/s

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

Radeon R9 280X
128 GTexel/s
Radeon HD 6870 X2
100.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R9 280X
4,096 GFLOPS
Radeon HD 6870 X2
4,032 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

Reviews Word on the street

Specifications Full list of technical specs


Radeon R9 280X  vs
HD 6870 X2 
GPU name Tahiti Barts XT
Market Desktop Desktop
Clock speed 850 MHz 900 MHz
Is dual GPU No Yes
Reference card AMD Radeon R9 280X 850 MHz 3 GB None

raw performance

Shading units 2,048 2,240
Texture mapping units 128 112
Render output processors 32 64
Compute units 32 28
Pixel rate 32 GPixel/s 57.6 GPixel/s
Texture rate 128 GTexel/s 100.8 GTexel/s
Floating-point performance 4,096 GFLOPS 4,032 GFLOPS


Radeon R9 280X  vs
HD 6870 X2 
Memory clock speed 1,500 MHz 1,050 MHz
Effective memory clock speed 6,000 MHz 4,200 MHz
Memory bus 384 bit 512 bit
Memory 3,072 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 288 GB/s 268.8 GB/s

noise and power

TDP 250W 300W


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