We are repurposing a R7525, which did not originally come with the BOSS S2 controller. We bought one separately, which does not come with cables, and naively bought the cables for the R750 thinking they might be the same. However, the communication cable is definitely not the same as the R7525 is meant to connect to the BOSS via what we think is xGMI. We have not been able to find this cable no matter where I search. Does anyone know where we can find the correct cables to connect the BOSS S2 to the R7525?