It appeared more that they are advertising systems with a Q9450, but not necessarily do they have them yet. I can remember when I tried to buy a Dell years ago that had a new Intel CPU in it. Their estimated delivery time was two months. I called up Alienware and asked about the latest AMD chip of the era, and they said they would have it to me in three to five days, including shipping time.
Ok, my point is that the Q9450 may have shown up on their website, but a person may have to wait a few months before it gets delivered. Don't know if Dell is better now on building and shipping then it was before, but that was my experience.