MSI Z97 XPOWER AC - Manual (Page 49)

Chapter 1
1-35 Getting Started
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.
Step A: 0.1MHz
(Default)
Step B: 1MHz
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
Enable the PCIe slot
Disable the PCIe slot
ON
1 2 3 4
PCI_E7 PCI_E5 PCI_E3 PCI_E1