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Differences What are the advantages of each

Front view of Radeon HD 6850

Reasons to consider the
AMD Radeon HD 6850

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Much higher effective memory clock speed 4,000 MHz vs 1,334 MHz Around 3x higher effective memory clock speed
Significantly higher memory bandwidth 128 GB/s vs 21.34 GB/s Around 6x higher memory bandwidth
Higher clock speed 775 MHz vs 600 MHz Around 30% higher clock speed
Better floating-point performance 1,488 GFLOPS vs 384 GFLOPS Around 4x better floating-point performance
Higher pixel rate 24.8 GPixel/s vs 4.8 GPixel/s Around 5.2x higher pixel rate
Significantly more render output processors 32 vs 8 24 more render output processors
More shading units 960 vs 320 Three times as many shading units
Higher texture rate 37.2 GTexel/s vs 19.2 GTexel/s Around 95% higher texture rate
Higher memory clock speed 1,000 MHz vs 667 MHz Around 50% higher memory clock speed
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More compute units 12 vs 4 Three times as many compute units
More texture mapping units 48 vs 32 16 more texture mapping units
Front view of Radeon HD 4720

Reasons to consider the
ATi Radeon HD 4720

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Lower TDP 55W vs 127W 2.3x lower TDP

Features Key features of the Radeon HD 6850  vs 4720 

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

Radeon HD 6850
128 GB/s
Radeon HD 4720
21.34 GB/s

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

Radeon HD 6850
24.8 GPixel/s
Radeon HD 4720
4.8 GPixel/s

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

Radeon HD 6850
37.2 GTexel/s
Radeon HD 4720
19.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6850
1,488 GFLOPS
Radeon HD 4720
384 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 6850  vs
4720 
GPU brand AMD ATI
GPU name Barts PRO RV730
Market Desktop Desktop
Clock speed 775 MHz 600 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 320
Texture mapping units 48 32
Render output processors 32 8
Compute units 12 4
Pixel rate 24.8 GPixel/s 4.8 GPixel/s
Texture rate 37.2 GTexel/s 19.2 GTexel/s
Floating-point performance 1,488 GFLOPS 384 GFLOPS

memory

Radeon HD 6850  vs
4720 
Memory clock speed 1,000 MHz 667 MHz
Effective memory clock speed 4,000 MHz 1,334 MHz
Memory bus 256 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR3
Memory bandwidth 128 GB/s 21.34 GB/s

noise and power

TDP 127W 55W

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