MSI Z97 XPOWER AC Manual page 47

BCLK_STEP1: Base Clock Step Swtich
This swtich provides two steps (1 MHz and 0.1 MHz) for the operation of Base Clock
Control Buttons.
1 2 3 4
PEGSW1: PCIe CeaseFire Switch
The PCIe CeaseFire switch can help you conveniently and directly control the installed
graphics cards without removing the physical graphics cards.
1 2 3 4
Step B: 1MHz
Step A: 0.1MHz
(Default)
ON
1 2 3 4
PCI_E1 PCI_E3 PCI_E5
En-33
Enable the PCIe slot
Disable the PCIe slot
PCI_E7