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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies

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Old 01-11-2019
boveywong boveywong is offline
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Default Any high wattage Titanium PSU can run passively?

I'm looking for a quiet 850W PSU and struggling to make a decision between

- The new Corsair AX850
- Seasonic Prime Ultra Titanium 850W
- EVGA 850 T2 (optional candidate)
(Not looking for ~600W fanless PSUs)

I've read the OC3D review of Corsair AX850 that the unit still runs passively after 20 minutes of full load, which is what I want. But the report from Cybenetics shows the fan starts at around 400W load.
On the other hand Seasonic's fan starts a bit earlier but at lower RPM overall.

Most of the time I use my PC browsing the web, watching Youtube. Sometimes gaming and video/audio editing/rendering.

Spec (everything air cooled):
i7 8700k 4.9GHz @ 1.3v
Asus Z390-E
4 x Kingston HyperX Fury 16GB 2666 1.2v
Nvidia 1080 FE (no OC yet)
Samsung 970 EVO 500GB, 860 EVO 1TB
2 x 5.4k SATA 2.5" HDD 2TB
5 x noctua A12x25
Fractal Design Define C

I'm currently using EVGA 850 G3 with ECO mode ON and it's the noisiest component. The PSU fan suddenly ramp up to quickly cool itself down after idling on desktop around 5-10 minutes and then back to passive mode and then ramp up again... repeat and repeat. Even with ECO mode off I still don't want that constant fan hum from the PSU. That's why I'm changing it.

Thanks
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  #2  
Old 01-11-2019
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tinpoint tinpoint is offline
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For the small system you don't need 850W, take the Seasonic Prime Fanless and you don't have to worry about the fan.



In the OC3D review of Corsair AX850 the fan did not start because the power supply unit was tested outside the case and did not warm up.
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Old 01-11-2019
boveywong boveywong is offline
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Quote:
Originally Posted by tinpoint View Post
For the small system you don't need 850W, take the Seasonic Prime Fanless and you don't have to worry about the fan.



In the OC3D review of Corsair AX850 the fan did not start because the power supply unit was tested outside the case and did not warm up.
I've used the PSU calculator and it says my load wattage is round 550W, I afraid I may actually able to reach such wattage while doing rendering. So I afraid the 600W fanless is not an option since I would like to keep some headroom for the PSU.
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Old 01-11-2019
Stefan Payne Stefan Payne is offline
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Quote:
Originally Posted by boveywong View Post
I've used the PSU calculator and it says my load wattage is round 550W,
They are lying to you and overestimating by a mile.
DO NOT Trust them!
Because CPU and GPU are the biggest Power consuming things...
The rest hardly matters...
Quote:
Originally Posted by boveywong View Post
I afraid I may actually able to reach such wattage while doing rendering. So I afraid the 600W fanless is not an option since I would like to keep some headroom for the PSU.
I doubt it.
Your System is probably nowhere near 500W...
And OC for a rendering machine? that is a bad idea s the OC increases the failure rates. And you might not want some problems with the rendering (and do it again), do you??

Anyway, you might want to get a Powermeter to measure the Power Consumption of your system for various reasons...

Thing is: 550W G3 would have been somewhat acceptable, the higher wattage are not...
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Old 01-11-2019
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ashiekh ashiekh is offline
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Perhaps another approach is to upgrade your case fans such that the flow through the power supply you have now is increased and eco mode no longer needs to kick in the power supply fan.
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Old 01-11-2019
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jonnyGURU jonnyGURU is offline
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Quote:
Originally Posted by boveywong View Post
I've read the OC3D review of Corsair AX850 that the unit still runs passively after 20 minutes of full load, which is what I want. But the report from Cybenetics shows the fan starts at around 400W load.
Because OC3D tests at room temperature and Cybenetics tests at 30 to 32°C.
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Old 01-11-2019
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I used to run my i7 8700K with all 6 cores at 5.0 GHz, Vcore=1.37. PSU was a 460w Seasonic Gold fanless. Admittedly there was no dGPU involved, but an OC'd 8700K had no problems with 460W. You should have no problem adding a GPU if your PSU is 600W.
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CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
Motherboard: Gigabyte Z370X Aorus Gaming 7
RAM: 4x16GB (64GB) Corsair LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
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PSU: Seasonic Platinum 660W
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Old 01-12-2019
boveywong boveywong is offline
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Thanks everyone's comments! I think I'll go with Seasonic 600W fanless then, but the price went up last night on newegg so I'll just wait.

Hope in the foreseeable future I will not need a 2080ti or additional GPU for rendering though.
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