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Differences What are the advantages of each

Front view of Radeon HD 8470

Reasons to consider the
AMD Radeon HD 8470

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Significantly higher effective memory clock speed 3,200 MHz vs 1,660 MHz Around 95% higher effective memory clock speed
Higher clock speed 775 MHz vs 670 MHz More than 15% higher clock speed
Slightly more memory 1,024 MB vs 256 MB 4x more memory
Lower TDP 35W vs 75W 2.1x lower TDP
Front view of Radeon HD 3690

Reasons to consider the
ATi Radeon HD 3690

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More render output processors 16 vs 4 12 more render output processors
Slightly higher pixel rate 10.72 GPixel/s vs 3.1 GPixel/s Around 3.5x higher pixel rate
Wider memory bus 128 bit vs 64 bit 2x wider memory bus

Features Key features of the Radeon HD 8470  vs 3690 

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

Radeon HD 8470
25.6 GB/s
Radeon HD 3690
26.56 GB/s

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

Radeon HD 8470
3.1 GPixel/s
Radeon HD 3690
10.72 GPixel/s

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

Radeon HD 8470
6.2 GTexel/s
Radeon HD 3690
10.72 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8470
248 GFLOPS
Radeon HD 3690
428.8 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 8470  vs
3690 
GPU brand AMD ATI
GPU name Caicos XT RV670
Market Desktop Desktop
Clock speed 775 MHz 670 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 160 320
Texture mapping units 8 16
Render output processors 4 16
Compute units 2 4
Pixel rate 3.1 GPixel/s 10.72 GPixel/s
Texture rate 6.2 GTexel/s 10.72 GTexel/s
Floating-point performance 248 GFLOPS 428.8 GFLOPS

memory

Radeon HD 8470  vs
3690 
Memory clock speed 800 MHz 830 MHz
Effective memory clock speed 3,200 MHz 1,660 MHz
Memory bus 64 bit 128 bit
Memory 1,024 MB 256 MB
Memory type GDDR5 GDDR3
Memory bandwidth 25.6 GB/s 26.56 GB/s

noise and power

TDP 35W 75W

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