MSI BIG BANG MARSHAL (B3) User Manual page 40

Hardware Setup Hardware Setup
PCI-E CeaseFre Swtch: PEG1, PEG2, PEG3, PEG4
The PCI-E CeaseFre swtch can help you convenently and drectly control the nstalled
graphcs cards wthout removng the physcal graphcs cards.
Important
Avod usng the swtchs whle the system s on; t wll damage the manboard.
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Enable the PCIE slot
Dsable the PCIE slot
PCI_E1 swtch
PCI_E3 swtch
PCI_E5 swtch
PCI_E7 swtch