300 watts power supply

I am currently rebuilding a Pc for a friend and i was wondering if i can use a splitter cable for the graphics card. So im working with an i5 750 and a gtx 460. The 300 watt power-supply in the system has one 8-pin connector for the cpu but no 6-pin connectors for the gpu. The power-supply is a...

I have a rx 570 4gb using on my gaming pc build but I always been using a 300wat power supply 😅😅 so yesterday I tried turning on my pc all the fans come on but the graphics card won’t power up I try removing it and my pc boot on normally so am wondering if because my power supply not powerful...