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Differences What are the advantages of each

Front view of Radeon HD 9970

Reasons to consider the
AMD Radeon HD 9970

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Much better floating-point performance 8,192 GFLOPS vs 2,800 GFLOPS Around 3x better floating-point performance
Significantly more memory 4,096 MB vs 1,024 MB 4x more memory
Higher clock speed 1,000 MHz vs 875 MHz Around 15% higher clock speed
Significantly higher memory bandwidth 307 GB/s vs 160 GB/s More than 90% higher memory bandwidth
Significantly higher texture rate 168 GTexel/s vs 70 GTexel/s Around 2.5x higher texture rate
Significantly higher pixel rate 64 GPixel/s vs 28 GPixel/s More than 2.2x higher pixel rate
Many more shading units 4,096 vs 1,600 2496 more shading units
Many more texture mapping units 256 vs 80 176 more texture mapping units
Significantly more render output processors 64 vs 32 Twice as many render output processors
Significantly wider memory bus 512 bit vs 256 bit 2x wider memory bus
Front view of Radeon HD 5870

Reasons to consider the
PowerColor Radeon HD 5870

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Lower TDP 188W vs 255W More than 25% lower TDP

Features Key features of the Radeon HD 9970  vs 5870 

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

Radeon HD 9970
307 GB/s
Radeon HD 5870
160 GB/s

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

Radeon HD 9970
64 GPixel/s
Radeon HD 5870
28 GPixel/s

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

Radeon HD 9970
168 GTexel/s
Radeon HD 5870
70 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 9970
8,192 GFLOPS
Radeon HD 5870
2,800 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 HD 9970  vs
5870 
GPU brand AMD ATi
GPU name Hawaii XT Cypress
Market Desktop Desktop
Clock speed 1,000 MHz 875 MHz
Is dual GPU No No
Reference card None ATi Radeon HD 5870 850 MHz 1 GB

raw performance

Shading units 4,096 1,600
Texture mapping units 256 80
Render output processors 64 32
Compute units 16 20
Pixel rate 64 GPixel/s 28 GPixel/s
Texture rate 168 GTexel/s 70 GTexel/s
Floating-point performance 8,192 GFLOPS 2,800 GFLOPS

memory

Radeon HD 9970  vs
5870 
Memory clock speed 1,250 MHz 1,250 MHz
Effective memory clock speed 5,000 MHz 5,000 MHz
Memory bus 512 bit 256 bit
Memory 4,096 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 307 GB/s 160 GB/s

noise and power

TDP 255W 188W

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