I think this mainly depends on your workloads. As others have stated, the CPU isn't all that fast RAM is even tighter.
Remember, it doesn't matter how much ram you have in total, if your individual nodes don't have enough resources for your most demanding workload, it can't run.
It could be interesting at least to see if these ARM devices of yours could be used as the control plane for K8S.
Again, RAM would be tight, but they could handle a small cluster I think. The only question would be whether the emmc is fast enough for etcd, but you can test that with fio.
I would play around with it. The worst thing that can happen is you gain experience with k8s and learn that those devices aren't really suitable.
I think this mainly depends on your workloads. As others have stated, the CPU isn't all that fast RAM is even tighter.
Remember, it doesn't matter how much ram you have in total, if your individual nodes don't have enough resources for your most demanding workload, it can't run.
It could be interesting at least to see if these ARM devices of yours could be used as the control plane for K8S.
Again, RAM would be tight, but they could handle a small cluster I think. The only question would be whether the emmc is fast enough for etcd, but you can test that with fio.
I would play around with it. The worst thing that can happen is you gain experience with k8s and learn that those devices aren't really suitable.