Amazon.com: Eyeboot 24 Pin to 18-Pin Power Supply ATX PSU Adapter Cable for HP Motherboards : Electronics
Amazon.com: COMeap 18 Pin + 10 Pin to 24 Pin ATX PSU Power Adapter Sleeved Cable for Corsair AX Series and Seasonic Power Supply 24.8-inch(63cm) : Electronics
Doubt about ATX 24 pin power supply cable compatibility (pinout) | TechPowerUp Forums