I installed 2x C2070 on slot3 and slot5 and 1x Quadro600 on slot1 in 7037A-i (MB: X9DAi), but the default output is on slot3 C2070. How do I make Quadro600 as default output?
You can go to BIOS => Advanced => PCIe/PCI/PnP Configuration, and disable PCIe Option ROMs for slot3 and slot5; only enable slot1 for Quadro600. Quadro600 will be default output then.