i'm looking at my owners manual (ASUS p4b266) and i'm trying to make sure i understand what the chart on page 2-14 (IRQ Assigments for this Motherboard) really means. before i try and contact ASUS support i thought i'd try here first. i understand what a shared interrupt is but as i look at this chart the top ledgend says A thru H. What does this represent? and where it says "used" as opposed to "shared". what does this tell me about the item it refers to? >> to anyone who is using this mobo, what slot selection and bios configs(if any) did you use to achieve as much IRQ isolation as possible.