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Differences What are the advantages of each

Front view of Radeon HD 4720

Reasons to consider the
ATi Radeon HD 4720

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Significantly lower TDP 55W vs 165W 3x lower TDP
Front view of Radeon HD 3870 X2

Reasons to consider the
ATi Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Significantly higher memory bandwidth 115.32 GB/s vs 21.34 GB/s Around 5.5x higher memory bandwidth
Higher clock speed 825 MHz vs 600 MHz Around 40% higher clock speed
Higher pixel rate 26.4 GPixel/s vs 4.8 GPixel/s 5.5x higher pixel rate
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
Significantly more render output processors 32 vs 8 24 more render output processors
Higher effective memory clock speed 1,802 MHz vs 1,334 MHz More than 35% higher effective memory clock speed
Better floating-point performance 1,056 GFLOPS vs 384 GFLOPS 2.8x better floating-point performance
More shading units 640 vs 320 Twice as many shading units
Higher memory clock speed 901 MHz vs 667 MHz More than 35% higher memory clock speed
Slightly more compute units 8 vs 4 Twice as many compute units

Features Key features of the Radeon HD 4720  vs 3870 X2 

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

Radeon HD 4720
21.34 GB/s
Radeon HD 3870 X2
115.32 GB/s

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

Radeon HD 4720
4.8 GPixel/s
Radeon HD 3870 X2
26.4 GPixel/s

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

Radeon HD 4720
19.2 GTexel/s
Radeon HD 3870 X2
26.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4720
Radeon HD 3870 X2
1,056 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 HD 4720  vs
3870 X2 
GPU name RV730 R680
Market Desktop Desktop
Clock speed 600 MHz 825 MHz
Is dual GPU No Yes
Reference card None None

raw performance

Shading units 320 640
Texture mapping units 32 32
Render output processors 8 32
Compute units 4 8
Pixel rate 4.8 GPixel/s 26.4 GPixel/s
Texture rate 19.2 GTexel/s 26.4 GTexel/s
Floating-point performance 384 GFLOPS 1,056 GFLOPS


Radeon HD 4720  vs
3870 X2 
Memory clock speed 667 MHz 901 MHz
Effective memory clock speed 1,334 MHz 1,802 MHz
Memory bus 128 bit 512 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR3 GDDR3
Memory bandwidth 21.34 GB/s 115.32 GB/s

noise and power

TDP 55W 165W


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