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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 3850 AGP

Reasons to consider the
HIS Radeon HD 3850 AGP

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Higher memory bandwidth 58.24 GB/s vs 12.8 GB/s More than 4.5x higher memory bandwidth
Higher effective memory clock speed 1,820 MHz vs 800 MHz More than 2.2x higher effective memory clock speed
Higher clock speed 720 MHz vs 600 MHz 20% higher clock speed
Significantly higher memory clock speed 910 MHz vs 400 MHz More than 2.2x higher memory clock speed
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
Slightly higher pixel rate 11.52 GPixel/s vs 4.8 GPixel/s Around 2.5x higher pixel rate
More render output processors 16 vs 8 Twice as many render output processors

Benchmarks Real world tests of Radeon HD 4650 AGP vs 3850 AGP

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 4650 AGP  vs 3850 AGP 

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 3850 AGP
58.24 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 3850 AGP
11.52 GPixel/s

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

Radeon HD 4650 AGP
19.2 GTexel/s
Radeon HD 3850 AGP
11.52 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4650 AGP
384 GFLOPS
Radeon HD 3850 AGP
460.8 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

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