System powers down due to excessive GPU usage
System powers down due to excessive GPU usage
Hi, I'm working on resolving an issue with my multi-GPU setup. The system powers off before POSTing when I connect more than five GPUs (currently seven). It functions properly with four GPUs. I've used the same motherboard, CPU, RAM, and power supplies previously, but this change triggered the shutdown. I've replaced components like the motherboard, RAM, CPU, and PSUs without success. I've unplugged each GPU one by one to check connections and PCIe slots, tested different BIOS settings, and even tried running the PC from batteries on the UPS to eliminate power issues. A benchmark showed the fifth GPU delivering only about half its intended performance. Now it seems the system can only run with four or fewer GPUs. I'm looking for any suggestions or alternative approaches.
Hello, your feedback is helpful. It seems many of your points were previously considered or addressed.
1) The setup with seven GPUs across four 1500W power supplies looks solid.
2) The need for that many units isn't necessary—7 high-end GPUs would consume around 450W each, totaling about 3150W. Even including the power draw from the motherboard, it stays under 4000W. Plus, they aren’t drawing full power when starting up.
3) You mentioned updating the BIOS, which is good. I’ll double-check those settings in the BIOS.
Thanks for your input!