ASRock Z77 OC Formula Quick Installation Guide - Page 45
can use PCIe ON/OFF Switch
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PCIe ON/OFF Switch (SWITCH1) (see p.2 No. 9) ON 123 1: PCIE2 2: PCIE4 3: PCIE5 PCIe ON/OFF Switch allows you to enable and disable the corresponding PCIE x16 slots. When one of the installed PCIE x16 cards is out of order, you can use PCIe ON/OFF Switch to find out the faulty one just with a single click without removing the cards. 1. Make sure that you power off the system before changing the switch. 2. When you turn off PCIe ON/OFF switch, your PCIE card could be burnt if it was poorly designed. For more information about your card's specifications please contact the card's vendor. 3. PCIe ON/OFF switch is for debug only. If you do not want to use your PCIE card, please remove it from the motherboard. English 45 ASRock Z77 OC Formula Motherboard