You could confirm your presumption from the above link, it is a tray or OEM processor, if part number is CM8062101163000 or something.
You can download the manual for that mobo from the above link, and turn to page 3, you could find the information on the screenshot above. This mobo does support this processor!
This message was posted on behalf of Intel Corporation
I can confirm that the Intel® Server Board S2600CP will support only the processors listed below:
The processor E5-2689 belongs to the E5-2600 family but it will be an OEM processor. I cannot guarantee 100% compatibility with the Intel® server board.