CableMod was the first place I looked, but no cables for BQ units are available there.
I don't know if the pinout on the PERIF of the 600 BQ would be the same as other models such as a GQ, G2, G3, etc. (probably not)..EVGATech_JoseR or Moderators Cool GTX and Sajin may know, they have access to information from EVGA that ordinary humans don't
If the pinout and keying is the same as some other models, that would be cool..Then you could get a cable, no problemo.
If it has a different pinout, you could get/use a cable (and not necessarily for an EVGA unit) that's properly keyed (rounded/squared) to fit in the PSU and rearrange the terminals as necessary on the PSU end so that the correct voltages are on the SATA end.
Rounded will fit in square, but not vice-versa..You can use an Xacto/Utility knife to shave off square corners to fit easily in rounded holes.
All you need is a el cheapo digital voltmeter to check the pinout voltages and a pin/needle/small paperclip/terminal tool to depress the terminal tab inside the connector to remove the terminals from the connector so they can be rearranged..Pinout on the component ends are Intel industry-standard.
The pinout for SATA power is
here for the component end..That's what's important..Whatever you do, always check the pinout voltages on the component end.
You should probably be more than good using a Y splitter..Maximum
current spec per SATA wire is 1.5 amps..Watts to Amps Calculator
here.
Those are more options and information for you.