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Differences What are the advantages of each

Front view of Radeon Sky 500

Reasons to consider the
AMD Radeon Sky 500

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Higher clock speed 950 MHz vs 850 MHz More than 10% higher clock speed
Slightly more memory 4,096 MB vs 3,072 MB Around 35% more memory
Significantly lower TDP 150W vs 250W 40% lower TDP
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 153.6 GB/s Around 90% higher memory bandwidth
Better floating-point performance 4,096 GFLOPS vs 2,432 GFLOPS Around 70% better floating-point performance
Higher effective memory clock speed 6,000 MHz vs 4,800 MHz 25% higher effective memory clock speed
Higher texture rate 128 GTexel/s vs 76 GTexel/s Around 70% higher texture rate
More shading units 2,048 vs 1,280 768 more shading units
More texture mapping units 128 vs 80 48 more texture mapping units
More compute units 32 vs 20 12 more compute units
Higher memory clock speed 1,500 MHz vs 1,200 MHz 25% higher memory clock speed

Features Key features of the Radeon Sky 500  vs R9 280X 

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

Radeon Sky 500
153.6 GB/s
Radeon R9 280X
288 GB/s

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

Radeon Sky 500
30.4 GPixel/s
Radeon R9 280X
32 GPixel/s

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

Radeon Sky 500
76 GTexel/s
Radeon R9 280X
128 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon Sky 500
2,432 GFLOPS
Radeon R9 280X
4,096 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


Radeon Sky 500  vs
R9 280X 
GPU name Pitcairn Tahiti
Clock speed 950 MHz 850 MHz
Is dual GPU No No
Reference card None AMD Radeon R9 280X 850 MHz 3 GB

raw performance

Shading units 1,280 2,048
Texture mapping units 80 128
Render output processors 32 32
Compute units 20 32
Pixel rate 30.4 GPixel/s 32 GPixel/s
Texture rate 76 GTexel/s 128 GTexel/s
Floating-point performance 2,432 GFLOPS 4,096 GFLOPS


Radeon Sky 500  vs
R9 280X 
Memory clock speed 1,200 MHz 1,500 MHz
Effective memory clock speed 4,800 MHz 6,000 MHz
Memory bus 256 bit 384 bit
Memory 4,096 MB 3,072 MB
Memory type GDDR5 GDDR5
Memory bandwidth 153.6 GB/s 288 GB/s

noise and power

TDP 150W 250W


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