B - Processor Core Power Connector
Part Number: 4006188RECS 945GCT-M3 Motherboard

Processor core power connector This is the processor core power connector on the motherboard. This 2 × 2, 12-volt power connector provides power directly to the processor voltage regulator and is keyed for proper connection of the power supply lead.

Use of this connector is required for proper operation of the motherboard.