Re: Adjusting dedicated video memory
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This option can be found in your BIOS/setup. Usually accessed when hitting DEL or F10 when booting up your PC. Depending on your computer, there is a minimum and maximum amount of memory that can be dedicated to the GPU. I don't know if adding more will help significantly with your game play but you can experiment with it.
PC: AMD Phenom 9950 2.6ghz Quad Core, ATI Radeon HD 5770, 8gb DDR2 RAM
Phone: Apple iPhone 5s 64gb (jailbroken)
Handheld Games: Nintendo 3DS XL, Tapwave Zodiac 2, GamePark Holdings GP2X F100