There is no such thing.

Oh yes! Try this Vegan Alfredo from my award-winning column, "Veganize It!" in VegNews: http://bit.ly/hCPfOd. Enjoy and happy cooking!

You could make the cheezy sauce from Veganomicon and leave out the turmeric (that makes it yellow).
http://alisvegankitchen.blogspot.com/2008/02/pasta-with-cheezy-saucemmmmm.html

For even more creaminess you can make some cashew ricotta (recipe from the same book) and fold that in with the pasta.

Brown crushed garlic in olive oil or margarine; add a spoon of flour and toast to make a roux. Then pour in a cup of non-dairy milk (I prefer cashew-based Mimicreme but have had success with soy). Season with salt (to taste depending on whether you used margarine).

It's possible to make a vegan "cheese" sauce out of potatoes, onions, garlic, and carrots cooked together, then pureed with soymilk (or water) vegetable margarine, cashews, lemon juice, mustard, salt and pepper. See here for a vegan mac and cheese recipe featuring this sauce:
http://www.vegnews.com/web/articles/page.do?catId=10&pageId=40
You can also make a vegan "alfredo" with nutritional yeast.

what are you asking? Vegetarian? Vegan? Other?