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So I am using a vm for ubuntu and i want to use my full 2GB of video memory from my graphics card, and i can boost the memory to 256MB but its nowhere near what i want. Is there a mod, driver, ANYTHING, that can allow me to get more than a useless 256MB of video memory?

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    According to answer in other question 256MB is the maximum. Also see Superuser question – bain Jan 18 '16 at 1:38
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It is possible to assign up to 256 MB of RAM to the virtual graphics driver as shown in my answer to this question:

Memory above that value may be useful for 3D-applications. These will make use of the host 3D graphics driver and host VRAM which is passed through to the virtual graphics driver in case 3D capability was enabled in the machine's settings.

So you will use all your host's video ram for 3D rendering in a virtual machine.

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    I'm not sure if I understand this correctly. I can only assign up to 256MB but this value is irrelevant because virtualbox will use my graphic cards memory directly anyway? – Felipe Dec 19 '16 at 1:21
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    @Felipe: yeah that's it. – Takkat Dec 19 '16 at 12:03
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    pardon my ignorance, but what is the setting for then if it is irrelevant? – David Torrey Jun 13 '17 at 18:12
  • @DavidTorrey you may need it in case you don't use the Guest Additions driver but software rendering on a huge display instead. – Takkat Jun 13 '17 at 19:50

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