Edit: corrected some misworded parts
If 45Drives is selling theirs with 12A individually wired then I’d assume the PSU they’re using splits it’s 12V over multiple discrete rails and to deliver 20A to the backplane they had to do it that way
I don’t think it does, its an RM750e and from what I understand splitting the 12v rail is rare and only for very high wattage power supplies, the tech document says nothing about split rails just a total amperage.
From a homelab users perspective even if you had 15, 20TB Exos drives they pull less than 1A per in use it seems when being all hammered with reads, thats less than 12.5 amps total with the datasheet and napkin math, spin up is transient and shouldn’t matter really as long as the power supply doesn’t trip. With that amperage I’m not sure if 1x4 is a problem, 2x2 is definitely safer, 4x1 is probably overkill and this is coming from someone who did 4x1
I got 200mm which was a touch too long on a RM850 but whatever
