Hx750 significant noise at any load level

[DrewUniverse]

It's my first time buying my own power supply, at least by itself. I chose the HX750 for reasons including modular cabling, the wattage I was looking for, and low noise when idle. However, this PSU seems far from quiet. I'd like help figuring out if I misjudged the idle noise advertised, or if something's wrong with the fan. Here's what I do know:

 

• The noise level does not change between idle and heavy loads
  
• The noise level does not change when switching between single and multi rail
  
• The vertical fan is down-facing in a Thermaltake V9 Black case, with PSU mounted on the bottom of the case.
  
• The rest of my PC specs are in my profile if you need them.
  

 

It's strange for me because I was previously running on an old AX1200 with the same setup, and that sounded quieter. I thought it was supposed to have higher noise levels than this HX750? I feel embarrassed and would like assistance. Thanks in advance.

Edited December 20, 2020 by DrewUniverse
improved title

[LeDoyen]

if it is fan noise you are having, try flipping the PSU around, fan up.

heat rising to the PCB when fan is down tends to cause the fan to spin when there's no need to.

with the fan up, the PSU will run on passive cooling a lot more.

[DrewUniverse]

if it is fan noise you are having, try flipping the PSU around, fan up.

heat rising to the PCB when fan is down tends to cause the fan to spin when there's no need to.

with the fan up, the PSU will run on passive cooling a lot more.

 

I'd love to try, because fan-up was the orientation on my AX1200. However, the way the screwholes are positioned on this HX750, I am forced to mount it with the fan facing down. I'd have to have it in there loose, or build some kind of custom brace. I'll see what I can do.

[jonnyguru]

I'd love to try, because fan-up was the orientation on my AX1200. However, the way the screwholes are positioned on this HX750, I am forced to mount it with the fan facing down. I'd have to have it in there loose, or build some kind of custom brace. I'll see what I can do.

 

That... doesn't make sense. Screw holes are standardized/universal. The PSU should mount either way.

 

What chassis are you using?

 

EDIT: It's the Thermaltake V9? That's the problem. Most cases have two sets of holes so the PSU can be mounted either way. The Thermaltake case you're using only has one set of mounting holes.

Edited December 21, 2020 by jonnyguru