hondah731 :
Cheap power supply intex 450 watt
I use 2 molex to 6pin connector
If a psu does not have a 6 pin connector, it likely does not have the amperage to support one.
Replace that psu with a quality unit asap.
The danger is not that it does not work, the danger is that if the psu should fail under load, it will not have the protective circuitry to keep from damaging all your other parts.
Here is one list of psu quality:
https://linustechtips.com/main/topic/631048-psu-tier-list-updated/