Super Drive Issue

I got my Dual 2.0 G5 on the 16th and I love it. I did have one issue that bothers me.

Supposedly this has a 4x Super Drive in it. When I burn a DVD it takes about an hour to burn whether I use choose for Toast to burn at best speed or manually choose 4x. I figured that maybe it could be the media so I went out to Comp USA and purchased a different Brand of 4x Media. It still took an hour to burn. So I said to myself what the heck I’d choose the burn at 8x DVD this time and now it will burn a DVD in 13 minutes 45 seconds.

Anyone have any insight on this matter?