iMac 24" Mid 2007 2.8GHz mini-display port question.

I have a question regarding my mid 2007 24" iMac. It has the mini-display port logo on the back of it, but the mini-display port does not fit in whats there. The connector there is different. The iMac is a 2.8GHz CPU model. If you look at the online specs under Apple support, it does not show 2.8GHz, but 2.4GHz. I believe when I purchased this from Apple, they were offering a SE edition of the 24" which has the 2.8GHz. So trying to figure out what the connect is that is under the "mini-display" logo on the back.

Thanks,

-KR