hi, this is my first time asking a question here.
i recently built my own PC and i am using my old GPU, gt 630 1GB and everything is fine, but i just bought a used GPU (asus AMD eah6850 1GB) and i want to test it out to see if its better than my gt 630, because it was only 20 dollars. my problem is that i accidentally bought a psu without any PCIe cables, and the AMD graphics card needs 2 6pin connectors. my psu has 2 free molex connectors, and i found an adapter that is from 2 molexes to an 8pin pci, and then another adapter that is 8 pin to 2x 6+2pin pci, so logically it would all connect fine, using the 2 adapters together, but would it be possible and run okay? i searched how many watts my PC would use with that GPU and it said only 370, and i have a 500 watt psu, so to me i think everything should be fine for now until i can afford a better psu. also the graphics card is from like 2011 so i think my 2019 psu should handle it.
the specs are
ryzen 5 2600x
8gb ddr4 ram
asrock b450m-prof motherboard
120gb ssd
500 gb hdd
500w non-modular psu 80+ certificate
zotac gt 630 1gb vram
i am saving money to get the rx 570 8gb but i am just using my old one for now.