I am trying to set up a multi-GPU rig (based on mining rigs) for machine learning, and it needs two power supplies. I’m using the Supermicro M12SWA-TF motherboard (it is an oversized board of SSI EEB form factor), 6 Nvidia 1080 Ti GPUs (that each have an 8-pin and 6-pin input), one 1000W PSU for the motherboard and 2 GPUs, and one 1200W PSU for the remaining 4 GPUs. I have two sets of questions:
1. The risers connecting the GPUs to the motherboard have no power inputs. Why do posts talk about powering the risers from the same PSU that powers the GPUs? The GPUs have 6-pin and 8-pin inputs that I am planning to power from the same PSU.
2. Why do posts talk about splitter cables that connect both PSUs to the motherboard? What is this accomplishing? Also, the motherboard has four power inputs, 1 24-pin and 3 8-pin. Do I need to connect all four to both PSUs?
1. The risers connecting the GPUs to the motherboard have no power inputs. Why do posts talk about powering the risers from the same PSU that powers the GPUs? The GPUs have 6-pin and 8-pin inputs that I am planning to power from the same PSU.
2. Why do posts talk about splitter cables that connect both PSUs to the motherboard? What is this accomplishing? Also, the motherboard has four power inputs, 1 24-pin and 3 8-pin. Do I need to connect all four to both PSUs?