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see this for example:

 

GeForce 8800 GT



Stream (Shader) Processors

128

Core Clock (MHz)

612

Shader Clock (MHz)

1500

Memory Clock (MHz) x2

1080

Memory amount

768 MB

Memory Interface

384-bit

HDCP

Yes

 

ATI Radeon
HD 3870

 

# of transitors

666 million

Stream Processing Units

320

Clock speed

775+ MHz

Memory Clock

2.25 GHz (effective)

Math processing rate (Multiply Add)

497+ GigaFLOPS

Texture Units

16

Render back-ends

16

Memory

512MB GDDR3/4

Memory interface

256-bit

Fabrication process

55nm

Power Consumption (peak)

~105W

 

 here u see that the radeon 3870 have more power but its perform far less than the 8800 GT... so its not about power.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

see this link: http://www.guru3d.com/article/amd-ati-radeon-3850--3870-review/3