I said to buy 3 stick kit because the three stick well run in tri channel when you only have 3 sticks installed.
You said in your first post that you were talking about 4 sticks. I went back and look at the book.
If you use 4 sticks the way I said to put them in, they will run tri channel not daul. If you put them in slots 1,2,3,& 4 then they will run daul channel.
It will tell you in the book how to run the sticks on memory and in what slots.