hi thank you for reporting this problem
i think right now i'm doing the same mistake, not sure if i understood correctly though
I have 2 evga 1300 and one is powering the risers and the other psu is powering the gpu. do you think this is risky ? both psu are connected to different circuits
AFAIK you are risking crosstalk through the GPU.
Are you saying you are powering the risers
only with a 1300w PSU and all the 6 or 8pin GPU connectors with the other PSU?