Thank you for your inquiry. The MB705M2P-B uses a SFF-8639 connector. Depending on what you are trying to connect the MB705M2P-B to, you may need specific cable adapters. Some of the cable adapters for SFF-8639 would need a power connection from a SATA 15 pin connector. Ideally, the SATA 15 pin connector would be from your PC power supply.
If the power supply does not supply the 3.3v line, it is possible the drive might not function in the converter. What are you trying to connect the MB705M2P-B to?