About the problem of video memory. AMD M880G with ATI HD 4200 has 256 memory when tested, but the system shows that it can occupy 1600 memory as video memory.

First of all, the optimization of Darksiders is very, very bad. Of course you can't play with integrated graphics, maybe you can try this. Download 3DA graphics card acceleration from My Space. It can forcefully turn off some effects that cannot be turned off. This way you can play more smoothly. .

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Virtual video memory? I've never heard of it. Video memory is just video memory, so there's nothing virtual about it. You want to increase the video memory, right? It can only be upgraded to a maximum of 512M of video memory. Set in BIOS. It is more reasonable for you to set 512M of 4G memory. . You won’t be able to use it all anyway. But it's just a little satisfying psychologically, but it may not actually improve much.

You cannot change the graphics card of your notebook by yourself. . You can only replace it with the same model of graphics card, and the improvement is minimal.