SFX PSU Help

ChrisLandin · 19 Jun 2021 at 16:14

Hi guys.

I've built a new machine, specs as below

Ryzen 3700x
Strix 570-i
16gb 2 x 8gb corsair rgb ram
Asus TUF 3070
H115i platinum
4 x ll120, 2 x ll140, 3 x ql120 fans then a further 2 x 140 fans on my rad out of site.
2 x nvme ssds and one sata ssd
K95 keyboard and a Corsair headset stand oh yea a Corsair rgb mousemat!

All housed in a lian Li 011 mini.

Pc works great. Its all powered by the Corsair SFX 750w psu.

Now my question is this psu ok for the setup I have? I only ask as of late the fan on the psu seems to be spinning up really loud and in the past it didnt happen.

To this new build i've added a fair few rgb fans and swapped out my old 2070 super to the 3070 so i was just wondering if i'm on the edge of what the psu can do?

Also i'm wanting to do a mod to my case where i'm trying to add a laptop screen into the front panel to work as a second display so I need to know if im going to have enough juice.

TIA

tamzzy · 19 Jun 2021 at 16:20

your corsair 750w sfx will be fine.
it would be able to power a 3080 too...not just a 3070

nlel1975 · 19 Jun 2021 at 16:22

The EVGA power meter suggests that a 550W could run that machine so you’re not on the verge of over doing it with a 750W.

ChrisLandin · 19 Jun 2021 at 17:14

Cheers guys.

Tetras · 19 Jun 2021 at 22:27

ChrisLandin said:
Hi guys.

I've built a new machine, specs as below

Ryzen 3700x
Strix 570-i
16gb 2 x 8gb corsair rgb ram
Asus TUF 3070
H115i platinum
4 x ll120, 2 x ll140, 3 x ql120 fans then a further 2 x 140 fans on my rad out of site.
2 x nvme ssds and one sata ssd
K95 keyboard and a Corsair headset stand oh yea a Corsair rgb mousemat!

All housed in a lian Li 011 mini.

Pc works great. Its all powered by the Corsair SFX 750w psu.

Now my question is this psu ok for the setup I have? I only ask as of late the fan on the psu seems to be spinning up really loud and in the past it didnt happen.

To this new build i've added a fair few rgb fans and swapped out my old 2070 super to the 3070 so i was just wondering if i'm on the edge of what the psu can do?

Also i'm wanting to do a mod to my case where i'm trying to add a laptop screen into the front panel to work as a second display so I need to know if im going to have enough juice.

TIA

I don't know much about your PSU, but SFF PSUs tend to have smaller fans than ATX PSUs and have to work a little harder for decent airflow. You didn't change the fan config in a way that has made the PSU starved for air, I assume? (e.g. reversing a fan)

ChrisLandin · 20 Jun 2021 at 12:45

Tetras said:
I don't know much about your PSU, but SFF PSUs tend to have smaller fans than ATX PSUs and have to work a little harder for decent airflow. You didn't change the fan config in a way that has made the PSU starved for air, I assume? (e.g. reversing a fan)

No change apart from the move to a newer gpu. I think it’s just down to temps being higher currently. As for the psu itself it’s in a separate chamber on the case and it has a vent right above the psu fan to draw in cool air

PurePickage · 20 Jun 2021 at 23:00

ChrisLandin said:
Hi guys.

I've built a new machine, specs as below

Ryzen 3700x
Strix 570-i
16gb 2 x 8gb corsair rgb ram
Asus TUF 3070
H115i platinum
4 x ll120, 2 x ll140, 3 x ql120 fans then a further 2 x 140 fans on my rad out of site.
2 x nvme ssds and one sata ssd
K95 keyboard and a Corsair headset stand oh yea a Corsair rgb mousemat!

All housed in a lian Li 011 mini.

Pc works great. Its all powered by the Corsair SFX 750w psu.

Now my question is this psu ok for the setup I have? I only ask as of late the fan on the psu seems to be spinning up really loud and in the past it didnt happen.

To this new build i've added a fair few rgb fans and swapped out my old 2070 super to the 3070 so i was just wondering if i'm on the edge of what the psu can do?

Also i'm wanting to do a mod to my case where i'm trying to add a laptop screen into the front panel to work as a second display so I need to know if im going to have enough juice.

TIA

You’ll be perfectly fine mate. I’m using the same PSU with a 3090 and 5900x without issue.

You can always load up HWinfo and see what your power draw is

***F1ZZY*** · 30 Jun 2021 at 07:13

I had the same psu on a very similar rig and the psu fan hardly spun at all. It was motionless until about 350w and after that was slow and quiet.

Having said that, the psu died in 3 months so perhaps that isn’t the norm.

marlies · 9 Jul 2021 at 00:05

A 600W unit will work fine even after accounting for aging a few years down the line, but most SFX PSUs start getting noisy when going over 70% rate loading. This may or may not affect you depending on the rest of your system components. You can read about a particular model's noise-to-load in most decent PSU review.