The higher the graphics card model (P1000, 2000, 4000, 5000), the more GPU RAM in built into the card. It would allow your machine to handle larger, more complex models with ease. Most people pick the lower end models due to cost. The high end cards will allow you to do things such as Point Cloud Processing and running multiple VM environments faster. Before buying the card you choose, verify it can handle all of the different Autodesk software you will run with it...not just Revit. Some cards are compatible with AutoCAD or Revit....some cards are compatible with both or more Autodesk products.
Dzan Ta, AEE, ASM, ACI.

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