The Power Supply Thread

[hoejholm]

On 5/4/2022 at 12:13 PM, Visuals said:

Currently i'm running the following cunfiguration:

Intertech IPC 4U-4420 Case
AMD Ryzen 5 5600G
10x Sata drive
1x NVME
be quiet! System Power 9 (500 W)

When i add one more drive, then i suddenly get issues with my drives, they disconnect and are giving read errors etc.

i suspect that my PSU is not strong enough to handle all of it.
My Case can fit 22 HDD's and 2 NVME and i plan to fill them one after another.
In this case i have 5 Molex connectors, each of them powers 4 drives.

Do you have any suggestions about a power supply that can handle all this stuff?

Thanks a lot for you help
 

@Visuals

Using this: https://outervision.com/power-supply-calculator

When i punch in your data + random stuff in the places you didn't tell (memory eg), with 2nvme and 10 sata 7200rpm I get you need 17,2A on the +5v

https://www.bequiet.com/en/powersupply/1280 says your PSU is max 15A on +5v... Could very well be your issue.

Also, I get a combined 3,3+5v to be 131W, your PSU max is 110W

 

Same spec but bumped to 20 HDD +2 NVME, we hit:

+3,3v: 13A

+5v: 22,5A

 - Combined 157w

+12v: 26,1A

 

I have had great experience using Intertech's ASpower PSU. This model fits your case model: https://www.inter-tech.de/en/products/psu/server-psu/aspower-r2a-mv0700 (There are other models, look up your model and look under acc.)

The specs says:

+3,3v: 30A

+5v: 30A

 Combined max: 200w

+12v: 58A

 

This should keep you well in the clear, unless you have some crazy poweruser in the rack you didn't mentioned... Plus, its redundant.

 

 

Notes:

The website is a calculator, take everything as an estimate. (with 20+ drives the difference between power hungry and power-saving drives becomes a thing...)

Edited July 7, 2022 by hoejholm

[Lolight]

The reegularly updated PSU tier list:

 

https://cultists.network/140/psu-tier-list/

[trurl]

On 9/6/2022 at 2:17 AM, Lolight said:

The reegularly updated PSU tier list:

 

https://cultists.network/140/psu-tier-list/

Go for a single rail model

[tucansam]

Have modern SFX PS's caught up to ATX's in terms of build quality, wattage, and bomb-proof-ness?  I need to replace a decade-old ATX PS as I'm trying to solve a strange issue that might be PS related.  I have room for another ATX, but moving to an SFX would allow me quite a bit more cable management and customization, every little bit of room matters.

 

This would be a 10th gen i7 with 15 spinners and two NVMe SSDs, along with a super lower power VGA card and an LSI HBA.  Several fans, nothing major.

 

Cold start power-ons and parity checks are of course my main concern, when power draws are maxed.

 

As an aside, I am reading through this thread now, but any recommendations on a good PS in an appropriate wattage would be appreciated. 

 

Thanks.

[Lolight]

On 10/23/2022 at 9:57 PM, tucansam said:

any recommendations on a good PS in an appropriate wattage would be appreciated.

You can check the link in the prior posts above.

[Stubbs]

Is it possible for a molex connector to not deliver enough power to an HDD?

I recently upgraded my server from 3TB WD Reds to 10TB Seagate Ironwolfs, and the Ironwolfs kept returning errors in my server. Sometimes I'd get the parity sync working, but it would work at about 800kbps which would've taken about a year to finish.

I fixed it by taking the Seagates out of the Hotswap Bay and into the case's internal 3.5" bay, and connecting them directly to both the motherboard (SATA) and the PSU (SATA Power connector).

My Hotswap Bay has two SATA power connectors, and one of them is powered by a Molex connector (because that's all I could fit). Could a Molex cause a power bottleneck for higher capacity drives?

 

 

Edited November 1, 2022 by Stubbs

[Vr2Io]

15 minutes ago, Stubbs said:

Could a Molex cause a power bottleneck for higher capacity drives?

No.

 

15 minutes ago, Stubbs said:

Ironwolfs kept returning errors in my server

Problem there.

[zipityzi]

On 12/27/2021 at 9:27 AM, NAStyBox said:

I went from gold to gold. 

Old - https://www.amazon.com/Seasonic-Semi-Modular-Control-Application-SSR-550LM/dp/B08WNL4ZFJ
New - https://www.amazon.com/Corsair-RM850x-Fully-Modular-Supply/dp/B08R5JPTMZ

 

Then the UPS load went from 229 to 225. 

 

I think that's due to 80+ ratings being minimums. So PSUs even just below Platinum still are rated Gold. The Corsair RM850X actually is Platinum-level efficient at 20% load / 170W (Platinum minimum: 90%; achieved: 90.5%), but it's just a bit short for 50% load / 425W (Platinum minimum: 92%; achieved: 91%) and 100% load / 850W (Platinum minimum: 89%; achieved: 86%). 

 

For those PSUs, according to the 115V efficiency charts by SeaSonic and Corsair:

1. Seasonic SSR-550 (80+ Gold): This PSU is ~90% efficient at 250 watts.
2. Corsair RM850x (80+ Gold): This PSU is ~91.5% efficient at 250 watts. 

1.5% loss @ ~250W is 3.75 watts additional loss, which looks close to your data.

Edited December 11, 2022 by zipityzi
sig figs

[zipityzi]

On 10/23/2022 at 10:57 AM, tucansam said:

Have modern SFX PS's caught up to ATX's in terms of build quality, wattage, and bomb-proof-ness?  I need to replace a decade-old ATX PS as I'm trying to solve a strange issue that might be PS related.  I have room for another ATX, but moving to an SFX would allow me quite a bit more cable management and customization, every little bit of room matters.

 

This would be a 10th gen i7 with 15 spinners and two NVMe SSDs, along with a super lower power VGA card and an LSI HBA.  Several fans, nothing major.

 

Cold start power-ons and parity checks are of course my main concern, when power draws are maxed.

 

As an aside, I am reading through this thread now, but any recommendations on a good PS in an appropriate wattage would be appreciated. 

 

Thanks.

 

This might be too late for a reply, but to answer the general question of SFX vs ATX:

 

To paint broad strokes, SFX & ATX today can overlap on quality & watts with two exceptions: 1) ultra-short millisecond-type GPU spikes / transients beyond the rating (due to smaller capacitors on SFX models) and 2) availability of 850W+ SFX PSUs. 

 

SFX are still quite a bit pricier & rarer (e.g., availability, region), though. Still, 650W from an SFX PSU = 650W from an ATX PSU, all other things equal.  To actually compare SFX vs ATX: it'd have to be a model vs model comparison, as the overlap goes both ways: good SFX beats bad ATX, but good ATX beats bad SFX. The PSU's test results matter more than the form factor, which is an improvement from the earliest SFX days.