difference in the finished soup.

For a thinner or thicker soup: If the soup seems too thick after blending, stir in a little extra warm broth until it reaches the consistency you like. If it seems too thin, let it sit uncovered on high for a short time before adding any more liquid.
For the smoothest texture: Blend thoroughly and give the soup a minute or two longer than you think it needs. Potato soups can go from slightly rustic to beautifully velvety