I have a bunch of 2tb drives that are connect to an LSA HBA passed through to an OMV VM on proxmox in an old HP elite desk 800 G3. My issue is powering them.
Currently I have a SATA extender going from one of the SATA power cables to 2 of the drives outside the case and the other 2 are powered by the other built in sata power.
I don't really want to continue doing this as I believe it's risky and doesn't allow me to fill the HBA. I don't really want to get a new case (yet) as this would mean building a whole new machine since the HP mainboard is one of the ones with proprietary mounting etc. but I also can't swap out the PSU as it's one of the narrow ones custom made to fit the case.
So I've landed on getting an ATX power supply and jumping the pins to power it on.
My question is what particular features should I be looking out for? Is all I really need just a modular PSU with as many sata connectors as possible? I figure 500-600watts should basically be overkill for my use case (at max I'm looking at 8 drives, either WD reds or HGST ultrastar).
Any guidance is appreciated, thanks.