Magma PCIe Expansion System EB2R - Manual (Page 58)

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SW11 Position:
By default, the EB2 system comes with the two switches in the OFF
position (meaning, that their speed is thermally controlled
automatically). By switching them ON, the user can effectively bypass
this circuitry and set the fans’ rotation speed to maximum.
This setting is particularly recommended if one plans on using double-
wide PCIe video cards or other peripherals known to generate
excessive heat, while the additional noise generated by the fans is not a
concern.