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From my personal experience, I do not believe there is too much of a performance impact. It depends on how much vram is needed and how much you have. And sometimes it depends on how the engine handles textures. For example, if a game requires around 1.5GB (Average) of VRam for textures, and your GPU has only 1GB, you should be fine.

Furthermore, If you are only off by a little, it is not a big deal. But if the game requires 1.5GB or so of VRam, and you only have 256MB of VRam, then you are going to be seeing some issues.

If you are suffering from performance issues, do not first assume it is the Vram, as it could just be the GPU itself. I find people usually claiming the Vram to be the culprit of bad performance, even if the person is off by just a little.

From this, I conclude that you can be missing around .5GB (512MB) of Vram, and you won't notice too much of an issue.

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12y ago

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Q: What happens if you don't have enough video ram while playing a game?
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