i recently for a QC-2018 (qumolu) converted to Truenas… all is fine BUT the PSU fan are driving me nuts … i can hear them 1 mile away
using 2x 1u by 1u redundant psu m1u-2750V.
these us 40mm by 20mm fans…
So if i replace them with NF-A4x20… i fear that there will not be enough static pressure and taht my psu could overheat and die
anybody with experience in same kind of "mod "
NOTE: i loaded the server with 3 raid card, 1 gpu T600, 1x 4x nvme, and of course 36X 2TB hgst sas hd…
I don’t think it’s worth the risk to be honest. I came into a similar problem with my 3U Supermicro Server (uses 1U PSUs) and ended up switching to their SQ (superquiet) line of PSUs rather than risking modding them. I’d take a look around and see what other PSUs could be compatible with the system?
thank you,
its already a 4 u case but as 2u for mtb/psu, i wanted to meaby use a regular psu outside the case, but not psu i know of can handle lots of wattage on 5volt rails
i removed a tray in the back that used to hold 4 ssd. now i have 2u for sure.
but the thing is i need those connectors that are on the right side in the photo that connects to the hdd back plane… i also have 3 other backplane under this motherboard/psu
i don’t know if this is standard somehow … or i would have to make my own (not a problem).
I’ve sadly only altered the fan on a 1u fortimail appliance using a 300w psu - since the load is not that high, and it was placed in a cool environment, it worked fine. However, you have 2x, and at 750w, and guessing with the parts you added, you have a lot of higher load than one ssd and “just” the board+mem+cpu+nic.
I’d say perhaps there’s easier to see if you can ramp the fans down with a normal fan resistor - depending on the fan… but, yeah, tricky.
From what I could find about that PSU, it would look like those fans are 40x28mm, not 40x20.
Like others warned, modding a PSU comes with risks, but I would not over-exagerate it, it can be done. You can see whether your PSU is anywhere close to hot when using it. if you feel it barely warm to the touch you most likely have room to reduce the fan speed, though this may not be available to be done by the PSU, having slower more silent fans is a possibility though to be honest, if those need to move significant air, then you won’t have a truly silent one, there is so much you can do in 40mm…
Next thing to consider is whether the connector on the fan is the same as what you will get on standard fans, and whether those fans are speed controlled? and if yes, voltage controlled or PWM?
Check carefully.
Another option with the space you have in your case would be to look at different form factor for PSU (but that’s more of an investment then…)
If you are still on to do it, I’ll do a bit of an ad for our S4028-6k then , they may fit your needs.
First you should check if the psu’s actually would run on 208-240V.
Then the question is if the psu actually runs the fan depending on the temp, or if it just runs at full speed all the time.
And it also depends what heats up. I guess 240V will only help on the primary side of the power circuit where you need half the amps when you double the voltage.
You can by using a Y Combiner cord, the two circuits that the cord is plugged into must be on two different “legs” of the main breaker box though. Also you do not want to have any GFCI in front of either circuit or it will trip.
-do this at your own risk because it is against best practices, but FWIW I have a cable that has two NEMA 5-15P’s that feed into a IEC C19 to give my UPS 240v and have been using it for many years without issue.
, they may fit your needs.