Buy with Confidence: With Monoprice's Lifetime Warranty on all Cables, you can rest assured we stand behind our products and our customers. However existing system cases and power supplies may have an insufficient number of SATA power connectors while still retaining the older Molex connectors Make sure your drive does not require 3. 3 VDC before purchasing this adapter cable The Serial ATA standard provides for the adoption of a new 15-pin drive power connector replacing the ubiquitous 4-pin Molex connector