How could I ended up with different processor in my new laptop?

It’s been a week since I bought my new laptop and I just recently install the ‘Drive Detective’. The problem is that when I checked up its processor in Drive Detective it said something like this:

System Information

Machine information: Dell Inspiron 1440

Operating system: Windows XP Professional

Physical memory: 2.00 GB

Processor model: Intel Pentium III Xeon Processor (2x)

Motherboard model: Dell inc. -0K138P.

This is of course different from what I previously checked on ‘dxdiag’. It said that:

Processor: Intel® Core™2 Duo CPU T6500 @ 2.10GHz (2 CPUs)

Well I’m not a computer person but it really freaks me out when I saw my laptop is a Pentium III type. I’m really confused about this. How could I really know about the Pentium type of my laptop? Please help! Any advice would be appreciated! Thank you!