You need 12volts,
pcie is 12 volts... molex is 5 volts.
A pci-e splitter(pcie to 2x pcie) might work...but I highly suggest getting a psu with the proper connectors.
ok tnx any ps that is ok for 6 gpus and normal price chieftec has 1250 w for 188 euros that the cheapest what i now that arent so bad. (and iam EU not USA) so no eggs pls;)