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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 higher memory bandwidth 307 GB/s vs 96 GB/s Around 3.2x higher memory bandwidth
Much better floating-point performance 8,192 GFLOPS vs 1,792 GFLOPS More than 4.5x better floating-point performance
More memory 4,096 MB vs 1,024 MB 4x more memory
Many more shading units 4,096 vs 896 3200 more shading units
Many more texture mapping units 256 vs 56 200 more texture mapping units
Significantly higher texture rate 168 GTexel/s vs 56 GTexel/s 3x higher texture rate
Significantly higher pixel rate 64 GPixel/s vs 16 GPixel/s 4x higher pixel rate
Many more render output processors 64 vs 16 48 more render output processors
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
Front view of Radeon HD 7790

Reasons to consider the
AMD Radeon HD 7790

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Higher effective memory clock speed 6,000 MHz vs 5,000 MHz 20% higher effective memory clock speed
Higher memory clock speed 1,500 MHz vs 1,250 MHz 20% higher memory clock speed
Much lower TDP 85W vs 255W 3x lower TDP

Features Key features of the Radeon HD 9970  vs 7790 

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

Radeon HD 9970
307 GB/s
Radeon HD 7790
96 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 7790
16 GPixel/s

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

Radeon HD 9970
168 GTexel/s
Radeon HD 7790
56 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 9970
8,192 GFLOPS
Radeon HD 7790
1,792 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
7790 
GPU brand AMD AMD
GPU name Hawaii XT Bonaire XT
Market Desktop Desktop
Clock speed 1,000 MHz 1,000 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 4,096 896
Texture mapping units 256 56
Render output processors 64 16
Compute units 16 14
Pixel rate 64 GPixel/s 16 GPixel/s
Texture rate 168 GTexel/s 56 GTexel/s
Floating-point performance 8,192 GFLOPS 1,792 GFLOPS

memory

Radeon HD 9970  vs
7790 
Memory clock speed 1,250 MHz 1,500 MHz
Effective memory clock speed 5,000 MHz 6,000 MHz
Memory bus 512 bit 128 bit
Memory 4,096 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 307 GB/s 96 GB/s

noise and power

TDP 255W 85W

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