The proper way to run 2 PSU at the same time is to make sure they are grounded together somewhere and make sure you are not sharing any 12V rails between the PSUs, or else you will blow one up. Basically if 1 GPU requires 2 PCIe connectors make sure they are connected to the same PSU not from one of each because you will get a current feedback loop.
Next is you need to get a paper clip and short those 2 pins so the PSU will turn on. Forgot which ones they are so just google it.
Then what you do is start them both at the same time, if you start one too early or late it won’t detect all the GPUs. Also maybe attach a fan or 2 so the second PSU doesn’t run without a load which can also damage the PSU.
Good luck.
I haven't mixed the PSUs as far as powering the GPUs, just the GPU and riser mix, but after getting a new PSU and splitters to test all the configurations i think i've ruled out the PSU as the cause... I have the ATX PSU triggering the server PSU via molex.
1) PSU1 powering the Mobo + risers and PSU2 powering the GPUS
2) PSU2 powering the Mobo + risers and PSU2 powering the GPUS
in both cases the rig will boot with one GPU but not two...
I'll try to reinstall windows as a last ditch effort. I'm considering returning the Mobo and trying another...
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