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Differences What are the advantages of each

Front view of Radeon HD 4650 AGP

Reasons to consider the
ATi Radeon HD 4650 AGP

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More texture mapping units 32 vs 16 Twice as many texture mapping units
Lower TDP 48W vs 75W More than 35% lower TDP
Front view of Radeon HD 3690

Reasons to consider the
ATi Radeon HD 3690

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Higher effective memory clock speed 1,660 MHz vs 800 MHz More than 2x higher effective memory clock speed
Slightly higher clock speed 670 MHz vs 600 MHz More than 10% higher clock speed
Significantly higher memory clock speed 830 MHz vs 400 MHz More than 2x higher memory clock speed
Slightly higher memory bandwidth 26.56 GB/s vs 12.8 GB/s More than 2x higher memory bandwidth
More render output processors 16 vs 8 Twice as many render output processors

Features Key features of the Radeon HD 4650 AGP  vs 3690 

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

Radeon HD 4650 AGP
12.8 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 4650 AGP
4.8 GPixel/s
Radeon HD 3690
10.72 GPixel/s

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

Radeon HD 4650 AGP
19.2 GTexel/s
Radeon HD 3690
10.72 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4650 AGP
384 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 4650 AGP  vs
3690 
GPU brand ATI ATI
GPU name RV730 RV670
Market Desktop Desktop
Clock speed 600 MHz 670 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 320 320
Texture mapping units 32 16
Render output processors 8 16
Compute units 4 4
Pixel rate 4.8 GPixel/s 10.72 GPixel/s
Texture rate 19.2 GTexel/s 10.72 GTexel/s
Floating-point performance 384 GFLOPS 428.8 GFLOPS

memory

Radeon HD 4650 AGP  vs
3690 
Memory clock speed 400 MHz 830 MHz
Effective memory clock speed 800 MHz 1,660 MHz
Memory bus 128 bit 128 bit
Memory 512 MB 256 MB
Memory type DDR2 GDDR3
Memory bandwidth 12.8 GB/s 26.56 GB/s

noise and power

TDP 48W 75W

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