I want to have this connector to molex adapter but I don't know what is the name of this one
6 pin power cord aka 6 pin graphics card power supply plug . You easily get a 4 pin to six pin adapter. These are primarily used on graphics cards. Make sure your PSU can handle the extra drain.
12v PCI-Express connector (6-Pin). This is generally used for high-speed video cards to provide more power than the motherboard can provide alone.