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Differences What are the advantages of each

Front view of Radeon HD 4650

Reasons to consider the
BIOSTAR Radeon HD 4650

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Higher clock speed 600 MHz vs 450 MHz Around 35% higher clock speed
More texture mapping units 32 vs 16 Twice as many texture mapping units
Higher memory clock speed 700 MHz vs 550 MHz More than 25% higher memory clock speed
Front view of GeForce 6800 Ultra Extreme AGP

Reasons to consider the
Nvidia GeForce 6800 Ultra Extreme AGP

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Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More render output processors 16 vs 8 Twice as many render output processors

Features Key features of the Radeon HD 4650  vs GeForce 6800 Ultra Extreme AGP 

effective memory clock speed Frequency at which memory can be read from and written to

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

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

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

Radeon HD 4650
19.2 GTexel/s

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

render output processors GPU commponents responsible for transform pixels as they flow between memory buffers

Specifications Full list of technical specs

gpu

Radeon HD 4650  vs
GeForce 6800 Ultra Extreme AGP 
GPU brand ATI Nvidia
GPU name RV730 NV40
Market Desktop Desktop
Clock speed 600 MHz 450 MHz
Is dual GPU No No
Reference card ATi Radeon HD 4650 600 MHz 256 MB None

raw performance

Texture mapping units 32 16
Render output processors 8 16
Pixel rate 4.8 GPixel/s 7.2 GPixel/s
Texture rate 19.2 GTexel/s 7.2 GTexel/s

memory

Radeon HD 4650  vs
GeForce 6800 Ultra Extreme AGP 
Memory clock speed 700 MHz 550 MHz
Effective memory clock speed 1,400 MHz 1,100 MHz
Memory bus 128 bit 256 bit
Memory 256 MB 256 MB
Memory type GDDR3 GDDR3
Memory bandwidth 22.4 GB/s 35.2 GB/s

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