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Differences What are the advantages of each

Front view of Radeon HD 3870

Reasons to consider the
Sapphire Radeon HD 3870

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Higher clock speed 825 MHz vs 700 MHz Around 20% higher clock speed
Higher effective memory clock speed 2,400 MHz vs 2,020 MHz Around 20% higher effective memory clock speed
Higher memory clock speed 1,200 MHz vs 1,010 MHz Around 20% higher memory clock speed
Slightly more shading units 320 vs 112 208 more shading units
Slightly lower TDP 106W vs 125W More than 15% lower TDP
Front view of GeForce GT 8800

Reasons to consider the
ASUS GeForce GT 8800

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Higher texture rate 39.2 GTexel/s vs 13.2 GTexel/s Around 3x higher texture rate
More texture mapping units 56 vs 16 40 more texture mapping units

Features Key features of the Radeon HD 3870  vs GeForce GT 8800 

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

Radeon HD 3870
76.8 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 3870
13.2 GPixel/s
GeForce GT 8800
11.2 GPixel/s

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

Radeon HD 3870
13.2 GTexel/s
GeForce GT 8800
39.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3870
528 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 3870  vs
GeForce GT 8800 
GPU brand ATI Nvidia
GPU name RV670 XT G92
Market Desktop Desktop
Clock speed 825 MHz 700 MHz
Is dual GPU No No
Reference card ATi Radeon HD 3870 777 MHz 512 MB Nvidia GeForce GT 8800 GT 600 MHz 512 MB

raw performance

Shading units 320 112
Texture mapping units 16 56
Render output processors 16 16
Pixel rate 13.2 GPixel/s 11.2 GPixel/s
Texture rate 13.2 GTexel/s 39.2 GTexel/s
Floating-point performance 528 GFLOPS 392 GFLOPS

memory

Radeon HD 3870  vs
GeForce GT 8800 
Memory clock speed 1,200 MHz 1,010 MHz
Effective memory clock speed 2,400 MHz 2,020 MHz
Memory bus 256 bit 256 bit
Memory 512 MB 512 MB
Memory type GDDR4 GDDR3
Memory bandwidth 76.8 GB/s 64.6 GB/s

noise and power

TDP 106W 125W

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