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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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Much higher memory bandwidth 288 GB/s vs 153.6 GB/s Around 90% higher memory bandwidth
Higher effective memory clock speed 6,000 MHz vs 4,800 MHz 25% higher effective memory clock speed
Better floating-point performance 4,096 GFLOPS vs 2,720 GFLOPS More than 50% better floating-point performance
Higher texture rate 128 GTexel/s vs 68 GTexel/s Around 90% higher texture rate
More memory 3,072 MB vs 2,048 MB 50% more memory
More texture mapping units 128 vs 80 48 more texture mapping units
More compute units 32 vs 20 12 more compute units
More shading units 2,048 vs 1,600 448 more shading units
Higher memory clock speed 1,500 MHz vs 1,200 MHz 25% higher memory clock speed
Wider memory bus 384 bit vs 256 bit 50% wider memory bus
Front view of Radeon HD 5770 X2

Reasons to consider the
Generic Radeon HD 5770 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU

Features Key features of the Radeon R9 280X  vs HD 5770 X2 

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

Radeon R9 280X
288 GB/s
Radeon HD 5770 X2
153.6 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 5770 X2
27.2 GPixel/s

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

Radeon R9 280X
128 GTexel/s
Radeon HD 5770 X2
68 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R9 280X
4,096 GFLOPS
Radeon HD 5770 X2
2,720 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 5770 X2 
GPU brand AMD ATI
GPU name Tahiti Juniper
Market Desktop Desktop
Clock speed 850 MHz 850 MHz
Is dual GPU No Yes
Reference card AMD Radeon R9 280X 850 MHz 3 GB ATi Radeon HD 5770 X2 850 MHz 2 GB

raw performance

Shading units 2,048 1,600
Texture mapping units 128 80
Render output processors 32 32
Compute units 32 20
Pixel rate 32 GPixel/s 27.2 GPixel/s
Texture rate 128 GTexel/s 68 GTexel/s
Floating-point performance 4,096 GFLOPS 2,720 GFLOPS

memory

Radeon R9 280X  vs
HD 5770 X2 
Memory clock speed 1,500 MHz 1,200 MHz
Effective memory clock speed 6,000 MHz 4,800 MHz
Memory bus 384 bit 256 bit
Memory 3,072 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 288 GB/s 153.6 GB/s

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