I have a X9DRW-IF, when I installed the RSC-RR1U-E16 PCI-E 3.0 x16 riser into the motherboard, it will not power up.
But the riser card works fine on the H8DGU-F motherboard.
Please do not use the RSC-R1UU-E16 riser card with the X9DRW-iF as that riser card is designed for UIO motherboards.
For 1U, please use the RSC-R1UW-2E16 instead.