Notes For microATX M/B, only top expansion slot can be used For miniITX M/B, the bottom expansion slot can bused for additional I/O, such as RS-232, USB, eSAT etc. For microATX M/B with PCIe x16 slot in position use DD-666 riser card. Please refer to Motherboard Slot Position document in FAQ. For miniITX and microATX M/B with PCIe x16 slot position 7, use DD-666-C5 riser.