Nvidia Geforce 9 Series

Graphics Card - Nvidia - GTX-960 - 2gb
Graphics Card - Nvidia - GTX-980Ti - 6gb

What are the accessories included with various products, how do we know list of contents?

You shall find a link on product page which shall lead you to the products webpage on the Brand owners, vendors website where you may check authenticated information, specifications, Images etc. about that product.

The link may say something like this ..
"Check This Product at it's Manufacturer Website for Images, Specifications and more"