Im missing a cpu to psu cable for my coolermaster 850 w V2 so im going to get an unofficial cable. Will that screw over my cpu? Its and 8 pin to 8 pin connector.
Get the official one, sometimes the pin outs for these cables are different, some models have capacitors in the cables themselves, and sometimes the gauge of the wire itself can be different for different models.
From what you said the above seems to be the right model, double check the part number for yourself first to be sure.
Get the right cable to remove the risk of damage to components.