If you have a PSU that big then that probably isn't the problem. I thought you might be using the PSU that comes with those extender boxes and they usually are very puny (250 W or so).
Do you use it for gaming or for CUDA?
Do you run the 4 GPUs in the extender?
So many potential failure points in there. The sole use case is CUDA. Essentially I wanted a portable cluster with GPUs and that did the work for a couple of month. Now it's getting more serious so the switch to T630 makes sense, and I repurposed the NUCs into the control plane of the K8s cluster.
https://clustercompute.com/images/image4.jpg
Which was a lot of fun.
Do you have all the GPUs internal to the T630?
Any chance of a picture (of the guts)?
I'm seriously thinking of duplicating your effort.
Replicating is not very hard. You need a lightweight x86 machine for MAAS, which takes ~20min to install, one VLAN for the iDRAC (IPMI), another for networking that can connect to internet, and off you go. You can also enable KVM power management in MAAS to run the Juju control plane in VMs and save a box if you're limited in compute power.
https://maas.io https://jujucharms.com/docs https://www.ubuntu.com/containers/kubernetes for all the goodies.
If you run into problems, I am SaMnCo on #juju in freenode.
I have plenty of other hardware floating around here so no problem on hooking it all up.
Thank you for the image.