Based on the specification of X9DRW-iF, it supports memory speed of 1600. I have X9DRW-iF motherboard with Intel E5-2620 CPU and DDR3 1600Mhz memories, but the BIOS is reporting that memory is running at 1333 only. Do you know why?
Intel E5-2620 processor only supports up to 1333Mhz memory.