This one:

https://www.newegg.com/p/3D5-000B-00061

is about 60% more expensive than this one:

https://www.newegg.com/p/3D5-000B-00054


The differences I'm seeing is 32 gig ram instead of 16, and dual gpu. Is the dual GPU causing that big price difference? What's the purpose of dual GPU?