The website says that it can take "Up to 2GB Single Channel DDR3 1333MHz 1 DIMM"
So, I very highly doubt it will take 8, I don't know if it will take 4 or not. Buy it, try it, if it doesn't work, return it.
Dell sold the vostro v13 with a 4gb configuration, So I'm sure theres a way of making a 4gb stick to work with it.
I guess I'll just buy a 8gb stick and see if it works. After I do I'll report back.