Motherboard X9SRL-F shows 2 PCI-e 3.0 x8 in x16 slots, but does not say if X9SRL-F supports x16 devices. Does motherboard X9SRL-F also support one or two x16 add-in cards running at x16?
No, X9SRL-F motherboard does not support PCI-e x16 add on card.