Swarles

Okay, I decided to go ahead and look at all the SFX and SFX-L power supplies in the Cybenetics database and found only one which seems to have good low-watt efficiency; the SilverStone Nightjar 450W (SST-NJ450-SXL). It is a SFX-L PSU from 2018 with a fanless design. Below you scan see the comparison to the RM550x (2021), I have scaled both the axes as best I can to make it easily comparable. All in all it is very close, perhaps very slightly less efficient... but it then easily beats all of them above 50W. Also, on the 5v & 3.3v rails, the other low-watt efficient options (see previous comment) are more efficient until about 30w and then the NJ450 becomes more efficient. As for the noise comparison data, this does not have a graph because it is a fanless design but obviously beats all of them. This was a very interesting find, I wasn't expecting it to be fanless and from 2018. I was hoping to find another SFX model that could compete, but sadly no others that are in the Cybenetics database came close. This isn't to say there aren't any other SFX PSU that come close. Unfortunately this PSU for me (and probably most of us) is not easily found.

Do we know of any other ATX or SFX power supplies that are efficient at low wattages? I did some digging on the Cybenetics database and found another ATX PSU that I haven't seen talked about, the Cooler Master V550 Gold V2. It seems to be right up there with the RM550x (2021) and slightly edging out the Pure Power 11 FM 550W (reaching greater efficiencies faster as the load increases). Interestingly the Cooler Master V550 Gold SFX (released at the same time) does not have good low watt efficiency. To summarise, PSUs with efficient low watt performance: PicoPSU Corsair RM550x (2021) Cooler Master V550 Gold V2 Pure Power 11 FM 550W Pure Power 12 M 550W I have included the efficiency and fan charts from Cybenetics and tried to scale them so that a direct comparison can be made. Also included the Corsair RM550x (2018) model, it should be noted the 2018 model is still a bit better at low loads compared to some other gold rated PSUs. Purely based on efficiency I think the CM V550 Gold V2 might edge out the others (especially at higher loads), but the fan noise tells a different story. At low loads all 3 are fantastic but at higher loads the CM V550 Gold V2 is quite a bit louder than the others. Unfortunately Cybenetics don't have results for the Pure Power 12 M 550W published. My hunt for a suitable PSU goes on, I just can't seem to source any of these in Australia. They seem to stock all the models except the 550W versions. The closest I can get is the RM650x (2021) and the Cooler Master V650 Gold V2 which both still have much better low watt efficiency than other brand 450-550W PSUs but are just way overkill for my system. Should I settle for a 650W PSU or keep searching? An SFX PSU with >70% efficiency at 2% load would be super nice, does anyone know of any?

Do you have the idle stats for the C states from Powertop? I am looking to build something very similar with the B760m DS3H and Pure Power 12M 550W but would like to get an idea if the B760m can get into C10 as easily as the B660m model used by "MagickPistacho". I currently run an Intel NUC which is obviously very low power draw but I need to expand storage. My proposed build is as follows: CPU: Intel i3 13100 Board: Gigabyte B760m DS3H PSU: Be quiet! Pure Power 12 M 550W RAM: 1x 16GB G.Skill Aegis F4 3200 SSD: 2x 1TB Samsung 970 EVO plus NVME (zfs raidz1 if possible) HDD: 2x 16TB Seagate IronWolf Pro Case: ? As small as possible with room for 6+ drives (can mod) Anyone got thoughts on this? The parts (not including case or storage) will set me back $630AUD (~420USD). It's kind of expensive for what I need...but realistically I just want as low idles as possible. Happy to hear suggestions on a different route (granted 2x m.2 and 2.5gbit lan)