If you look on the bottom of a DC there's a number in a circle. This number will tell you which DC you have. The number is either a '1' or a '2'. Sadly I can't remember which is which. Probably a google search will turn that info up for you. If I think about it, I'll look on the bottom of mine and let you know, mine is the one that will boot CDRs without a boot disk. I'm pretty sure the one with a '1' on the bottom is the one you want.
-S