Gaming PC performance

Hey,

I was wondering what performance the best gaming PCs available today have.

I know you can't say it like that but maybe somebody has some experience with the following:

As I was planning to make a game which will have:

• a quite big city

• up to 30 cars with about 100.000 - 160.000 Triangles each

• many Trees

• multiple light sources

So everything would of course be Unity optimized. But the I have a hard time to estimate whether the pc will be able to deal with the high detail car. I mean it would add up to about 4-5 million triangles for the cars only...

By gaming PC i mean something like a i7-4790 combined with a Radeon R9 280X and at least 16gb ram.

Would be great if somebody could share some experience whether this is possible.