Of course the moment I post this, I find the answer, lol. But anyway, for others that get this card (or other Radeon cards with the switch), here's the info on their site:
"BIOS SWITCH - If you graphics card is equipped with dual BIOS, the switch to is located near the power connections on the edge of the card’s PCB. The default shipping position is with the switched toggled closest to the power connectors, this is the performance BIOS. When the switch is toggled closer to the monitor outputs, the BIOS will be in the silent mode or mining mode depending on your model card.
The system must be shut down to switch between BIOS modes, additional a complete re-installation of drivers may be require for the new BIOS settings to take hold"
No idea why it's too much to ask of them to actually have that info accompany the GPU when you buy it, but at least now if you didn't know, you know.