I'm building a couple 24/7 uptime home NAS/fileservers. No graphics cards, old Supermicro server motherboards with onboard VGA, old Xeons and DDR3 ECC RAM, but multiple LSI HBA SAS cards and lots of drives (~12 per system).
I'm not quite sure what tier power supply I should aim for on this list. Tier B mentions 24/7 use; is that what I should probably go for? Is it worth going higher despite the fact I won't have discrete graphics cards in these systems?