No, typically Alienware uses Nvidia Graphics Cards
You could choose from a wide selection of graphic cards on Tech.Pronto.com. Most graphic cards on this site are reasonably priced and have good quality.
What are financial implications of grapic cards
Windows doesn't make the graphics cards for their computers. A company like dell, HP, acer etc. make graphics cards for windows computers
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Some specific high quality models for a Dell gaming laptop include Alienware M18x, which sells at $1900, $2250, and over $3100. You can get high quality processor,18 GB worth of memory and 680M graphic cards.
Try a store.
Geek and the Notebook Review Forum have reviews of laptop graphics cards. Other places to find such reviews include the websites of stores that sell the cards.
Currently, it is popular belief that an nVidia card would be more powerful than its ATi counterpart.
Yes there is, such as alienware with their M18X and 17X, ASUS,and MSI. They're replaceable video cards not really external and their cost is alot(about 1500 to 3000$)
The population of Alienware is 490.
GDDR5