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Differences What are the advantages of each

Front view of Radeon HD 4580

Reasons to consider the
ATi Radeon HD 4580

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Higher clock speed 796 MHz vs 700 MHz Around 15% higher clock speed
Lower TDP 65W vs 125W Around 50% lower TDP
Front view of GeForce GT 8800

Reasons to consider the
ASUS GeForce GT 8800

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Higher memory bandwidth 64.6 GB/s vs 22.18 GB/s Around 3x higher memory bandwidth
Higher effective memory clock speed 2,020 MHz vs 1,386 MHz More than 45% higher effective memory clock speed
Higher texture rate 39.2 GTexel/s vs 6.37 GTexel/s Around 6.2x higher texture rate
More texture mapping units 56 vs 8 48 more texture mapping units
More render output processors 16 vs 4 12 more render output processors
Higher pixel rate 11.2 GPixel/s vs 3.18 GPixel/s More than 3.5x higher pixel rate
Higher memory clock speed 1,010 MHz vs 693 MHz More than 45% higher memory clock speed
Wider memory bus 256 bit vs 128 bit 2x wider memory bus

Features Key features of the Radeon HD 4580  vs GeForce GT 8800 

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

Radeon HD 4580
22.18 GB/s
GeForce GT 8800
64.6 GB/s

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

Radeon HD 4580
3.18 GPixel/s
GeForce GT 8800
11.2 GPixel/s

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

Radeon HD 4580
6.37 GTexel/s
GeForce GT 8800
39.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4580
191.04 GFLOPS
GeForce GT 8800
392 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 4580  vs
GeForce GT 8800 
GPU brand ATI Nvidia
GPU name RV635 G92
Market Desktop Desktop
Clock speed 796 MHz 700 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GT 8800 GT 600 MHz 512 MB

raw performance

Shading units 120 112
Texture mapping units 8 56
Render output processors 4 16
Pixel rate 3.18 GPixel/s 11.2 GPixel/s
Texture rate 6.37 GTexel/s 39.2 GTexel/s
Floating-point performance 191.04 GFLOPS 392 GFLOPS

memory

Radeon HD 4580  vs
GeForce GT 8800 
Memory clock speed 693 MHz 1,010 MHz
Effective memory clock speed 1,386 MHz 2,020 MHz
Memory bus 128 bit 256 bit
Memory 512 MB 512 MB
Memory type GDDR3 GDDR3
Memory bandwidth 22.18 GB/s 64.6 GB/s

noise and power

TDP 65W 125W

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