Hi @wang.yang,
The GTX 1080 is a great card, but the newer generation RTX 20xx cards are generally more performant than the GTX 10xx equivalents. For most FlexSim models, you will have an amazing experience with both a 1080 or 2080.
From the recommended hardware article:
The better/newer/bigger/faster the graphics processor,
the better the performance.
Integrated graphics (Intel) have gotten much better in recent years,
but discrete graphics (Nvidia, AMD) remain the most powerful graphics
solution.
FlexSim works best on Nvidia GeForce GTX or RTX cards, but Nvidia
Quadro, AMD Radeon, and AMD FirePro are also good solutions. A newer
integrated Intel HD, UHD, or Iris graphics solution will work, but in
general will not perform as well as discrete graphics.