it's very difficult to replace your notebook's video card and it's not recommended. i think that your laptop may not be compatible with the video card or something like that. but i don't think you should upgrade. BTW you can play games for a very long time on laptops, like 1.5 hours.
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My comp:
AMD Opteron 165 (312x9 1.425V) (overclocked to 2.8GHZ,woot!)
Western Digital 160GB hard drive
DVD Burner
1GB RAM
Ultra Microfly
Nvidia 7900GS 256mb GDDR3 (stock)
Creative SB LIVE!
Logitech x-530
Envision 19" Widescreen LCD
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