According to Intel spec; Dual channel DDR can be named as channel A and B. In 8INXP, dimm slot 1 and 3 are channel A, dimm slot 2 and 4 are channel B. Dual channel mode will only work with DDR memory modules inserted in dimm slot 1&2 or dimm slot 3&4. DDR memory inserted in dimm slot 1&4 or 2&3 will only work as single channel mode, and only channel A is available. Memory in channel B will not be detected.
This yellow "!" mark indicates if Promise RAID controller was set to RAID mode, but there are no devices attached to it. This yellow "!" mark will disappear when RAID is properly set Stripe or Mirror and devices HDDs are attached.