The original 20 pins were unchanged. This tool has been tested by members of the Electrical Working Group on multiple channels and has reached version 0. It does not define error signaling and logging mechanisms for errors that occur within a component or are unrelated to a particular PCIe transaction.

Drives expect both 5 and 12 volts to be provided. Check the manufacturer's website.

If you look carefully at the image above then you can see the polarization of the pins which prevents you from plugging the cable in improperly. Currently, there is no well defined mechanism to consistently associate platform specific device names and instances of a device type under operating system. The 8 pin 12 volt cable is polarized so it can only be plugged into the 8 pin motherboard connector correctly.