I have just done a test on my board DQ45CB, so far, all that i remember for most Intel Desktop Board 4 Series, there is a section in the bios where the fan speed and features are shown.
Bios >> Advanced >>
There is two sections:
(i) Fan Control
(ii) Hardware Monitoring
I have added two screenshots as reference.
Note: you can monitor the hardware sensors from the Intel Desktop Utilities, but unfortunately you can not change the values.
Note: on some AMT board like DQ45CB and DQ45EK, there is a management engine control for fan. You will need to access the MEBx Bios by pressing Ctrl + P. I think that this feature is not present for the DP45SG board.
Hope this helps a bit.