Jumpexx

I’m putting together a small 24/7 NAS and trying to decide whether the efficiency badge actually matters at the loads this thing will see. Hardware is modest: a low-power Intel CPU, no GPU, four 3.5-inch drives that spin down most of the day, and a couple of NVMe drives. Measured at the wall with a decent meter, idle sits in the 30-50W range depending on whether the drives are asleep. Peak during spin-up is obviously much higher, but still nowhere near what a gaming box pulls.

I’ve got two candidates in mind: a 550W 80 Plus Titanium unit and a 650W 80 Plus Gold unit with a decent low-load review and a semi-passive fan. The Titanium unit is more expensive, but I’m not really chasing payback in a year — I’m more interested in whether it runs cooler and more efficiently in the range where this box actually lives. I know the 80 Plus tests are done at specific load points and that “Titanium” doesn’t automatically mean great 5VSB efficiency or a sensible fan curve.

So for those who have built low-idle NAS boxes: did moving to a higher-efficiency PSU make any real difference at the wall, or is this mostly a spec-sheet exercise once you’re down around 10% load? Also, how much attention do you pay to 5VSB and zero-RPM fan behavior in this kind of build? I’d rather avoid a PSU that cycles its fan every few minutes in a quiet room.

Honestly, at 30-50W the badge matters way less than the platform. I’ve seen Gold units that idle just fine and “better” units with lousy 5VSB behavior or a fan curve that can’t decide what it wants to do. CircuitWren, if you can find a review that plots efficiency down low and actually measures standby, that’s worth more than the sticker.

For a NAS I’d take a good Gold with a sane semi-passive curve over a Titanium unit that’s cycling the fan every couple of minutes. The difference at those loads is small enough that noise and standby heat would decide it for me.