Weirdest situation involving my Power supply and GPU

[Lawrence Lim]

Hi guys,

so I recently switched cases to a Phanteks Evolv ITX, and for some weird reason, after booting into Windows 10 (reach login screen) the PSU whirs loudly. This does not happen while browsing the BIOS.

Upon a removal of the cable (be it HDMI or displayport) connected to my GPU, the whirring stops and does not come back even when I reinsert the HDMI/DisplayPort cable.

What is wrong with my PSU??? In the BIOS, the voltages are
+3V 3.344V
+12V 12.168V
+5V 5.100V
so I doubt there is an issue with the power coming from the PSU?

Here's my build

PSU is a Seasonic S12G 450W
Gigabyte H270N-WiFi (ITX)
Zotac GTX 960
2x Corsair 140mm fans
1xPhanteks included 200mm fan

(I have personally checked, disabled my CPU fan, disabled my case fans and am positive it is the PSU making the noise)

**Just tried running a benchmark (3DMark Time Spy) and the whirring returns. But this time removing the HDMI cable does not take the whirring noise away.

So, anybody knows what is going on? I am very clueless. Thanks!!

 

[Yamitime]

Have u mounted the psu so the psu fan can expell air?
Its possible you may have mounted the psu upside down ,it will still fit but not allow the air from psu fan to cool psu.

 

[Lawrence Lim]

Have u mounted the psu so the psu fan can expell air?
Its possible you may have mounted the psu upside down ,it will still fit but not allow the air from psu fan to cool psu.

The fan is facing down from my casing where the filter is, so I'm pretty sure it's mounted correctly? the other side is opaque and fully sealed so this should be the only orientation... sadly.

 

[Lawrence Lim]

Have u mounted the psu so the psu fan can expell air?
Its possible you may have mounted the psu upside down ,it will still fit but not allow the air from psu fan to cool psu.

Took out the PSU and ran my build with PSU outside of casing resulted in 0 noise...

Then put PSU back in and ran again... 0 noise again...

All is well again....? What a mystery....