Ok, just one 4GB stick was sent out.
I just bought this PC last week from Staples in Washington, PA. I paid the price of Inspiron 660 Desktop for 8 GB memory, but come with a PC only have 4 GB memory. They do not want to do anything with it. After talk to them for 3 hours, they give me Dell number to call. Speak to Dell guy, one said Dell can not do anything, Staples sale man said they can not do anything because I should get a 8 GB PC. I really don't think either one of them doing the right with their business. I am going to order 4GB memory to install it. I point it out for people so  hopes that it will cause customers to purchase  the product elsewhere and we'll refrain from purchasing anything from Staples again.
Resolved - Inspiron 660, Staples purchase, incorrect ram