low fps gtx 1050

I use a pre built dell inspiron 3656 and i upgraded a couple components. I upgraded my AMD Radeon R9 360 to a Gigabyte Geforce GTX 1050 OC Windforce 2gb GDDR5. And I changed the power supply to an 500W EVGA 80 plus certified psu. My GPU doesnt use a PCI-E because it gets the power through...