I have an attribute called brand that shows what the brand is. I'm trying to group my products by brand and category.

Example
Product 1 (Category: Ram, Attribute:Brand:Kingston)
Product 2 (Category: Ram, Attribute:Brand:Corsair)
Product 3 (Category: CPU Cooler, Attribute:Brand:Corsair)
Product 4(Category: Mouse, Attribute:Brand:Logitech)

I want to be able to sort it like
Logitech            Corsair             Kingston
Product 4          Product 2         Product 1

                          Product 3

How do i go about doing this?