See the note at the bottom of Intel� Server Board S1200KP — Tested processor list
I also noticed that the i3-3220 is listed as compatible with the S1200BT series, but not the KP series
In addition to what Dan mentioned, please note there are no "validated" RAID controller cards on this board. This doesn't mean that they will not work, just that none have been tested.
I would suggest you go into the BIOS, Boot/Boot Display Options, and enable “Expansion Card Text”. Assuming there is enough available option ROM on this board this may allow the card to function. Additionally if there is not enough option ROM, disable boot to Network, and Boot to USB in order to free up some of that option ROM space. Lastly, make sure you have the “Fast Boot” options all set to disabled.
I will give that a try. But I was sure that I disabled most of option ROM. Doesn`t make sense that another raid card works and this one doesn't even get detected.
As for the CPU, the manual does state it supports 3rd generation intel core i3 processors with up to 95W TDP in an LGA1155 socket. The compatible products listed none of of the 3rd generation itnel core i3 processors. Does it mean Intel has not tested them? Or has not updated the compatible product list? Or should I always look at the compatible product and ignore the manual? If that's the case, can I even trust the manual for information?