Using PCIe and the sata cable from different models

Hi,

I have a Corsair RM 1000x and a Corsair CX450M.

What I want is to use the PCIe and the SATA cable from my CX450M with the new RM1000x, before I burn the house down I would like to know if this is safe ?

I was not able to find any specs regarding this, if some one have any info then it also could be appreciated.

Thx in advance

Edit: According to this: http://www.corsair.com/en-eu/landing/psu-cable-compatibility, the sata cable are compatible but I could not find any info. regarding the PCIe type4 on the CX-M, but the one (CX450M) I have, have a type4 connector, and I received a pcie (6+2) cable, dose not make any sens.

Edit 1: I have connected the PCIe (6+2) cable from the CX450M into RM1000x, and connected the other end to a Graphics card, and it works, but again is it safe ? in long run