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Differences What are the advantages of each

Front view of Radeon HD 7650

Reasons to consider the
AMD Radeon HD 7650

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Slightly higher effective memory clock speed 4,400 MHz vs 4,000 MHz 10% higher effective memory clock speed
Much lower TDP 55W vs 294W 5.3x lower TDP
Higher memory clock speed 1,100 MHz vs 1,000 MHz 10% higher memory clock speed
Front view of Radeon HD 5970

Reasons to consider the
ATi Radeon HD 5970

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much better floating-point performance 4,640 GFLOPS vs 672 GFLOPS Around 7x better floating-point performance
Significantly higher memory bandwidth 256 GB/s vs 70.4 GB/s Around 3.8x higher memory bandwidth
Significantly higher pixel rate 46.4 GPixel/s vs 6 GPixel/s Around 7.8x higher pixel rate
Significantly higher texture rate 116 GTexel/s vs 21 GTexel/s More than 5.5x higher texture rate
Many more render output processors 64 vs 8 56 more render output processors
Many more shading units 3,200 vs 448 2752 more shading units
More memory 2,048 MB vs 1,024 MB 2x more memory
Significantly more texture mapping units 160 vs 28 132 more texture mapping units
Significantly more compute units 40 vs 7 33 more compute units
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus

Features Key features of the Radeon HD 7650  vs 5970 

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

Radeon HD 7650
70.4 GB/s
Radeon HD 5970
256 GB/s

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

Radeon HD 7650
6 GPixel/s
Radeon HD 5970
46.4 GPixel/s
Since the ASUS EAH5970 review already covered every aspect about the card, we will jump straight on to the performance figures.
Radeon HD 5970 | by techPowerUp! (Nov, 2009)

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

Radeon HD 7650
21 GTexel/s
Radeon HD 5970
116 GTexel/s
At lower resolutions some benchmarks can't just render any faster, no matter the graphics power, because they have to wait for some data to be calculated on the CPU every single frame.
Radeon HD 5970 | by techPowerUp! (Nov, 2009)

floating point performance How fast the gpu can crunch numbers

Radeon HD 7650
672 GFLOPS
Radeon HD 5970
4,640 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 7650  vs
5970 
GPU brand AMD ATi
GPU name Cape Verde LE Hemlock
Market Desktop Desktop
Clock speed 750 MHz 725 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 448 3,200
Texture mapping units 28 160
Render output processors 8 64
Compute units 7 40
Pixel rate 6 GPixel/s 46.4 GPixel/s
Texture rate 21 GTexel/s 116 GTexel/s
Floating-point performance 672 GFLOPS 4,640 GFLOPS

memory

Radeon HD 7650  vs
5970 
Memory clock speed 1,100 MHz 1,000 MHz
Effective memory clock speed 4,400 MHz 4,000 MHz
Memory bus 128 bit 512 bit
Memory 1,024 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 70.4 GB/s 256 GB/s

noise and power

TDP 55W 294W

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