What GPU attribute is used by ArcGIS? Size/speed of video RAM? Core clocks? etc...

Hello,

I am building a computer to use mainly for ArcGIS. I can buy and configure any GPU setup I need to.

My question is what are the attributes most heavily used by this software? Does it depend most on the speed of the video processors? Does it need a lot of parallel cores? Does it need more memory?

Or, alternatively, which of these attributes is least used by ArcGIS? What can you skip without affecting performance?

Thanks.