I have a version of that too - select 8x and see what time it takes.
I have an old Emachines and evidently the ide drivers, system design, or something aren't up to it. Do a search, I posted a thread on it and many, many tried to help but nothing brought my speed up to where it should be.
8s is fast enough and gives great burns so I've been happy enough. In the mean time it really IS time to buy a new machine so I've been looking around but haven't seen anything yet. I'm thinking the right before school specials at the end of the summer will have the best choices for me.