How much video ram does the Lenovo ThinkPad Edge E531 15.6 FHD?

Hi i'm maybe planning to buy the Lenovo ThinkPad Edge E531 15.6" FHD but i'm just wondering how much video ram it have

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Depends on which video card it has:
The Nvidia 710m will have 1GB
The Nvidia GT740m will have 2GB
Intel HD Graphics uses the system RAM, and doesn't have dedicated video memory.