but my cards sapphire nitro 570  each one take 6 pin and 8 pin = 190 watt for each card . is the molex cand to power third card  which has  8 pin only  with causing instability  keep in mind i have one molex wire with 5 or 6 heads of molex

this my psu

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i have  small mining rig consists of g4400 and ram 4 gigabyte and 2 x sapphire 570 nitro plus each one of them take 8 bin and 6 bin for each card
 the problem is my psu it is thermaltake samrt pro rgb 850 watt  it had 2 slots for pcie    only  the question here can i put third card 570 through molex connection ?  and can it handle the power for sapphire 570 nitro +