Jumper Configurations; Reeltime 2 Jumper Diagram - Visual Circuits ReelTime 2 User Manual

The following figures show the default jumper settings for the
ReelTime 2 board. These jumper settings are for normal operation.
The exception is the voltage jumper. This jumper can be set as
follows:
Right position: Use 3.3V power on the bus for reduced
power consumption and heat dissipation
Left position: Default: Use 5V power on the bus (if the
machine doesn't have 3.3V.)
Be sure to verify with your system or motherboard manufacturer
for PCI voltage information.