Yes, it's possible otherwise Apple would be running afoul of the FTC and its various counterparts in other countries around the world.
The Mac Pro is designed for people who need some serious computing power, or just people with inferiority complexes who have to have some incredibly souped up machine to allay feelings of inadequacy.
As for it making a difference, it depends on what you are expecting. For the average computer user, this system is beyond overkill. It won't really make web browsing any faster, nor email, word processing, etc. But if you're doing a lot of high end video editing work, and you basically live inside Final Cut Pro, it can have a profound impact.
I was looking at the specs in which you can customize a Mac Pro and found that you can fit 32GB of RAM!! and Two 3.2GHz Quad-Core Intel Xeon!!!!!
IS THIS REALLY POSSIBLE!? AND IF SO, DOES IT MAKE ANY DIFFERENCE!?
Your knowledge please?