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Its very hard to upgrade a Laptops GPU, especially a Laptop like the one you have listed above, that machine isn't designed to play games on, if your looking to play games I would recommend getting either a Gaming Laptop which is going to cost alot, (£800-1300~) or go to a local computer repair shop and see if they can build you a cheap gaming desktop (£400-600~)
How can i increace my dedicated video ram on a toshiba laptop sattelite C855-27g
and unlock the overclocking option in the BIOS
answer fast plzz
thanks