Issue:
P8Z68-V PRO/GEN3(BIOS 3402) PCIE 16X_3 Slot Default X1 mode, but when two GV900 installation under ASUS M/B BIOS setting as "AUTO", the PCI slot will be set as X16 mode , the other GV900 will FAIL detection,
Answer:
Manually setting BIOS as X1 mode, all GV900 card can be detected.