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how many W a PSU for non-gaming Debian?

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  how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 16:30 +0100
    Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 16:40 +0100
    Re: how many W a PSU for non-gaming Debian? Henning Follmann <hfollmann@itcfollmann.com> - 2022-03-04 16:40 +0100
      Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 17:00 +0100
        Re: how many W a PSU for non-gaming Debian? <tomas@tuxteam.de> - 2022-03-04 18:00 +0100
          Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 19:10 +0100
            Re: how many W a PSU for non-gaming Debian? Eike Lantzsch ZP6CGE <zp6cge@gmx.net> - 2022-03-04 20:20 +0100
              Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 23:10 +0100
            Re: how many W a PSU for non-gaming Debian? Felix Miata <mrmazda@earthlink.net> - 2022-03-04 22:20 +0100
              Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 01:40 +0100
                Re: how many W a PSU for non-gaming Debian? Ash Joubert <ash@transient.nz> - 2022-03-05 02:10 +0100
                  Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 02:30 +0100
                    Re: how many W a PSU for non-gaming Debian? Ash Joubert <ash@transient.nz> - 2022-03-05 03:00 +0100
                  Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 09:00 +0100
                  Re: how many W a PSU for non-gaming Debian? Tixy <tixy@yxit.co.uk> - 2022-03-05 09:00 +0100
                Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 02:10 +0100
          Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 19:10 +0100
    Re: how many W a PSU for non-gaming Debian? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-03-04 16:50 +0100
      Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 17:10 +0100
        Re: how many W a PSU for non-gaming Debian? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-03-04 17:50 +0100
          Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 18:50 +0100
            Re: how many W a PSU for non-gaming Debian? Greg Wooledge <greg@wooledge.org> - 2022-03-04 20:40 +0100
              Re: how many W a PSU for non-gaming Debian? <tomas@tuxteam.de> - 2022-03-04 21:00 +0100
              Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 23:20 +0100
            Re: how many W a PSU for non-gaming Debian? <tomas@tuxteam.de> - 2022-03-04 20:40 +0100
              Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 23:20 +0100
          Re: how many W a PSU for non-gaming Debian? rhkramer@gmail.com - 2022-03-04 19:00 +0100
            Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 19:00 +0100
    Re: how many W a PSU for non-gaming Debian? Alexis Grigoriou <alexis@nanoid.net> - 2022-03-04 17:20 +0100
      Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 17:30 +0100
      Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 19:00 +0100
        Re: how many W a PSU for non-gaming Debian? "Andrew M.A. Cater" <amacater@einval.com> - 2022-03-04 19:40 +0100
          Re: how many W a PSU for non-gaming Debian? Henning Follmann <hfollmann@itcfollmann.com> - 2022-03-04 22:20 +0100
            Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 23:10 +0100
            Re: how many W a PSU for non-gaming Debian? Linux-Fan <Ma_Sys.ma@web.de> - 2022-03-04 23:40 +0100
              Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 00:00 +0100
                Re: how many W a PSU for non-gaming Debian? Linux-Fan <Ma_Sys.ma@web.de> - 2022-03-05 00:30 +0100
                  Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 01:30 +0100
                    Re: how many W a PSU for non-gaming Debian? Linux-Fan <Ma_Sys.ma@web.de> - 2022-03-05 20:30 +0100
                      Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-06 01:00 +0100
                        Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-06 07:10 +0100
                          Re: how many W a PSU for non-gaming Debian? songbird <songbird@anthive.com> - 2022-03-06 13:00 +0100
                          Re: how many W a PSU for non-gaming Debian? Linux-Fan <Ma_Sys.ma@web.de> - 2022-03-06 16:10 +0100
                            Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-07 18:50 +0100
                              Re: how many W a PSU for non-gaming Debian? Linux-Fan <Ma_Sys.ma@web.de> - 2022-03-07 19:10 +0100
                                Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-08 20:00 +0100
                                  Re: how many W a PSU for non-gaming Debian? Linux-Fan <Ma_Sys.ma@web.de> - 2022-03-08 22:00 +0100
              Re: how many W a PSU for non-gaming Debian? Tixy <tixy@yxit.co.uk> - 2022-03-05 09:10 +0100
                Re: how many W a PSU for non-gaming Debian? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-03-05 16:10 +0100
          Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-04 23:00 +0100
    Re: how many W a PSU for non-gaming Debian? Ash Joubert <ash@transient.nz> - 2022-03-05 00:50 +0100
      Re: how many W a PSU for non-gaming Debian? Stefan Monnier <monnier@iro.umontreal.ca> - 2022-03-05 01:20 +0100
        Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 01:40 +0100
        Re: how many W a PSU for non-gaming Debian? Ash Joubert <ash@transient.nz> - 2022-03-05 02:00 +0100
      Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 01:50 +0100
        Re: how many W a PSU for non-gaming Debian? Ash Joubert <ash@transient.nz> - 2022-03-05 02:10 +0100
          Re: how many W a PSU for non-gaming Debian? Emanuel Berg <moasenwood@zoho.eu> - 2022-03-05 02:30 +0100
            Re: how many W a PSU for non-gaming Debian? Ash Joubert <ash@transient.nz> - 2022-03-05 02:50 +0100

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#245879 — how many W a PSU for non-gaming Debian?

I've heard that for gaming you would want a 600~800W PSU [1]
but how do I know how many W I need for my computer use?
I think the most resource-intense I do would be compiling and
watching multimedia on mpv. [2]

Can you use powertop(1) for this or some other tool or can it
not be measured at the software level? And if it can't, can
you estimate it somehow?

TIA

[1] https://www.windowscentral.com/be-quiet-pure-power-11-fm-review

[2] https://dataswamp.org/~incal/ebchw/COMPUTER
    https://dataswamp.org/~incal/SOFTWARE

-- 
underground experts united
https://dataswamp.org/~incal

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#245880

> I've heard that for gaming you would want a 600~800W PSU but
> how do I know how many W I need for my computer use? I think
> the most resource-intense I do would be compiling and
> watching multimedia on mpv.

I think the method is rather to sum the W of all devices, in
my case the case, fans, GPU, keyboard, motherboard, RAM,
and SSD.

-- 
underground experts united
https://dataswamp.org/~incal

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#245881

On Fri, Mar 04, 2022 at 04:24:40PM +0100, Emanuel Berg wrote:
> I've heard that for gaming you would want a 600~800W PSU [1]
> but how do I know how many W I need for my computer use?
> I think the most resource-intense I do would be compiling and
> watching multimedia on mpv. [2]
>

That depends on the components in the computer.
The reason why gaming configuration often require a more
powerful power supply, because these use parts which consume
in general more power (gpu mainly).
 
> Can you use powertop(1) for this or some other tool or can it
> not be measured at the software level? And if it can't, can
> you estimate it somehow?

just sum up the thermal max load of the parts (you need the spec sheets).
and add 25% for general inefficiency. 

> 
> TIA
> 
> [1] https://www.windowscentral.com/be-quiet-pure-power-11-fm-review
> 
> [2] https://dataswamp.org/~incal/ebchw/COMPUTER
>     https://dataswamp.org/~incal/SOFTWARE
> 
> -- 
> underground experts united
> https://dataswamp.org/~incal
> 

-- 
Henning Follmann           | hfollmann@itcfollmann.com

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#245883

Henning Follmann wrote:

>> I've heard that for gaming you would want a 600~800W PSU
>> [1] but how do I know how many W I need for my computer
>> use? I think the most resource-intense I do would be
>> compiling and watching multimedia on mpv. [2]
>
> That depends on the components in the computer. The reason
> why gaming configuration often require a more powerful power
> supply, because these use parts which consume in general
> more power (gpu mainly).

Okay, but if I don't play games will the GPU still require
that much?

The GPU is a

  msi Nvidia Geforce GT 710, 2GB DDR3, PCI-E2.0, HDMI+DL-DVI-D

I think the other components are

  case
  fans
  keyboard
  motherboard
  RAM
  SSD

are any of those negligeable?

-- 
underground experts united
https://dataswamp.org/~incal

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#245891

[Multipart message — attachments visible in raw view] — view raw

On Fri, Mar 04, 2022 at 04:55:33PM +0100, Emanuel Berg wrote:
> Henning Follmann wrote:
> 
> >> I've heard that for gaming you would want a 600~800W PSU
> >> [1] but how do I know how many W I need for my computer
> >> use? I think the most resource-intense I do would be
> >> compiling and watching multimedia on mpv. [2]
> >
> > That depends on the components in the computer. The reason
> > why gaming configuration often require a more powerful power
> > supply, because these use parts which consume in general
> > more power (gpu mainly).
> 
> Okay, but if I don't play games will the GPU still require
> that much?

You want to plan your PSU's maximum output according to your
hardware's maximum input. Everything else will entertain you
debugging obscure problems.

Or rather: we want you to... (se above). Otherwise you'll be
coming here to debug obscure problems ;-)

> The GPU is a
> 
>   msi Nvidia Geforce GT 710, 2GB DDR3, PCI-E2.0, HDMI+DL-DVI-D

The Internets [1] say this one will take 19W maximum. But never
trust the Internets :-)

> I think the other components are
> 
>   case
>   fans
>   keyboard
>   motherboard
>   RAM
>   SSD
> 
> are any of those negligeable?

The case, I guess.  Most important is the motherboard /with/ CPU.
Look those up.

I think you can lump RAM, SSD and the rest into a handful of watts,
say 5 to 10. As others have said, add some headroom.

Cheers

[1] https://www.techpowerup.com/gpu-specs/geforce-gt-710.c1990

-- 
t

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#245899

OK, final word on this, "case" closed LOL :)

Thanks a lot for the help ...

Conclusion: a 300W PSU should do it!

GPU          geforce-gt-710          19
CPU          AMD mid end (4 cores)  125
fans          80 mm (3K RPM)          9   (3*3W =  9W)
             120 mm (2K RPM)         12   (2*6W = 12W)
motherboard  high end                80
RAM          ~DDR3 (1.5V)             3   (actually it is a DDR4)
SSD                                   2.8

Total:

  (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8)          ; 250 W

Total, with the GPU removed:

  (+ 125 (* 3 3) (* 2 6) 80 3 2.8)             ; 231 W

Total, with 25% wiggle room:

  (* 1.25 (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8)) ; 314 W

Total, w/o the GPU, w/ wiggle room:

  (* 1.25 (+ 125 (* 3 3) (* 2 6) 80 3 2.8))    ; 290 W

https://www.buildcomputers.net/power-consumption-of-pc-components.html
https://www.techpowerup.com/gpu-specs/geforce-gt-710.c1990

-- 
underground experts united
https://dataswamp.org/~incal

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#245904

On Freitag, 4. März 2022 15:04:26 -03 Emanuel Berg wrote:
> OK, final word on this, "case" closed LOL :)
> 
> Thanks a lot for the help ...
> 
> Conclusion: a 300W PSU should do it!
"might do it"

If (= provided that) you can trust the manufacturer for that statement 
"300W PS".
I tend to be wary of such statements. The maximum current provided for 
each voltage output would be more significant than the wholesale 
advertisement of "300W PS". Your calculation might be well within the 
limits in general but what if the load for e.g. 3.3V goes up to 12A but 
the PS is only able to deliver 10A? It might be well able to deliver 20A 
for 5V and 8A for 12V but your load does not need 5V or so much at 12V 
but more on 3.3V or even 1.8V. So be careful and have a look at each 
needed supply voltage and its power rating.

> 
> GPU          geforce-gt-710          19 [on which voltages?]
> CPU          AMD mid end (4 cores)  125  [on which voltages?]
> fans          80 mm (3K RPM)          9   (3*3W =  9W) [12V]
>              120 mm (2K RPM)         12   (2*6W = 12W) [12V]
> motherboard  high end                80 [that is on several diiferent 
voltages]
> RAM          ~DDR3 (1.5V)             3   (actually it is a DDR4) [on 
which voltages?]
> SSD                                   2.8 [5V and maybe 12V]
> 
> Total:
> 
>   (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8)          ; 250 W
> 
> Total, with the GPU removed:
> 
>   (+ 125 (* 3 3) (* 2 6) 80 3 2.8)             ; 231 W
> 
> Total, with 25% wiggle room:
> 
>   (* 1.25 (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8)) ; 314 W
> 
> Total, w/o the GPU, w/ wiggle room:
> 
>   (* 1.25 (+ 125 (* 3 3) (* 2 6) 80 3 2.8))    ; 290 W
> 
> https://www.buildcomputers.net/power-consumption-of-pc-components.html
> https://www.techpowerup.com/gpu-specs/geforce-gt-710.c1990

all by rule of thumb - and it's a very thick thumb with carpal tunnel 
syndrome I reckon.
-- 
Eike Lantzsch ZP6CGE

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#245922

Eike Lantzsch ZP6CGE wrote:

>> Conclusion: a 300W PSU should do it!
>
> "might do it"
>
> If (= provided that) you can trust the manufacturer for that
> statement "300W PS".

You mean they are known to supply incorrect specifications?

>> https://www.buildcomputers.net/power-consumption-of-pc-components.html
>> https://www.techpowerup.com/gpu-specs/geforce-gt-710.c1990
>
> all by rule of thumb - and it's a very thick thumb with
> carpal tunnel syndrome I reckon.

You think the approximations aren't exact enough?

I have a list of the PC components here:

  https://dataswamp.org/~incal/ebchw/COMPUTER

If you take a look at these digits

  GPU          geforce-gt-710           19
  CPU          AMD mid end (4 cores)   125
  fans          80 mm (3K RPM)           9    3*3W =  9W
               120 mm (2K RPM)          12    2*6W = 12W
  motherboard  high end                 80
  RAM          ~DDR3 (1.5V)              3    actually it is a DDR4
  SSD                                    2.8

one can already (thanks to Tamas) be happy with the GPU data,
that's official; and fans, RAM, and SSD seem to be negligible
(but of course the more exact the better including negligible
cases) - so what remains is the CPU and the motherboard.

You're right, I'll look for better data on those!

-- 
underground experts united
https://dataswamp.org/~incal

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#245917

Emanuel Berg composed on 2022-03-04 19:04 (UTC+0100):

> OK, final word on this, "case" closed LOL :)

> Thanks a lot for the help ...

> Conclusion: a 300W PSU should do it!

It might be just right. I've read 30% headroom is a good idea if you're starting
afresh. The largest I own is a 700W, used only for bench testing & burn-ins. The
largest I have installed, of which I own only one, is a 550W. I also have
installed multiple 500s, 450s, 380s, 350s, 430s, 400s. Most that are smaller are
OEM, mostly Dell, one HP, and old. I've needed to recap most of the older ones.
About half my PCs only have IGP, no discrete graphics. Most of this is to say it's
/easy/ to think you need more than necessary when the sale ads feature mostly
those above 500W, many of which have triple digit price tags. Using the online
calculators is smart. :)

None of my PCs have dual cards except for this one, which is using a 500W:

# inxi -SMCmyz
System:
  Kernel: 5.15.12-1-default x86_64 bits: 64 Desktop: KDE Plasma 5.24.2
    Distro: openSUSE Tumbleweed 20220302
Machine:
  Type: Desktop Mobo: Gigabyte model: GA-970A-D3 serial: N/A BIOS: Award
    v: F10 date: 05/30/2012
Memory:
  RAM: total: 15.55 GiB used: 938.8 MiB (5.9%)
  Array-1: capacity: 32 GiB note: est. slots: 4 EC: None
  Device-1: A0 size: 8 GiB speed: 1600 MT/s
  Device-2: A1 size: 8 GiB speed: 1600 MT/s
  Device-3: A2 size: No Module Installed
  Device-4: A3 size: No Module Installed
CPU:
  Info: quad core model: AMD Phenom II X4 965 bits: 64 type: MCP cache:
    L2: 2 MiB
  Speed (MHz): avg: 3423 min/max: N/A cores: 1: 3423 2: 3423 3: 3423 4: 3423
# inxi -Gayz
Graphics:
  Device-1: NVIDIA GF108 [GeForce GT 630] vendor: Gigabyte driver: nouveau
    v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 16 ports:
    active: DVI-I-1,VGA-1 empty: HDMI-A-1 bus-ID: 01:00.0 chip-ID: 10de:0f00
    class-ID: 0300
  Device-2: NVIDIA G84 [GeForce 8600 GT] vendor: XFX Pine driver: nouveau
    v: kernel pcie: gen: 1 speed: 2.5 GT/s lanes: 4 link-max: lanes: 16 ports:
    active: DVI-I-2,DVI-I-3 empty: none bus-ID: 05:00.0 chip-ID: 10de:0402
    class-ID: 0300
  Display: x11 server: X.Org v: 1.21.1.3 compositor: kwin_x11 driver: X:
    loaded: modesetting unloaded: fbdev,vesa alternate: nouveau,nv,nvidia
    gpu: nouveau display-ID: :0 screens: 1
  Screen-1: 0 s-res: 7760x1440 s-dpi: 120 s-size: 1642x304mm (64.6x12.0")
    s-diag: 1670mm (65.7")
  Monitor-1: DVI-I-1 pos: primary,left model: NEC EA243WM serial: <filter>
    built: 2011 res: 1920x1200 hz: 60 dpi: 94 gamma: 1.2
    size: 519x324mm (20.4x12.8") diag: 612mm (24.1") ratio: 16:10 modes:
    max: 1920x1200 min: 640x480
  Monitor-2: DVI-I-1-2 mapped: DVI-I-2 pos: center-r model: Acer K272HUL
    serial: <filter> built: 2018 res: 2560x1440 hz: 60 dpi: 109 gamma: 1.2
    size: 598x336mm (23.5x13.2") diag: 686mm (27") ratio: 16:9 modes:
    max: 2560x1440 min: 720x400
  Monitor-3: DVI-I-1-3 mapped: DVI-I-3 pos: right model: Dell P2012H
    serial: <filter> built: 2012 res: 1600x900 hz: 60 dpi: 92 gamma: 1.2
    size: 443x249mm (17.4x9.8") diag: 508mm (20") ratio: 16:9 modes:
    max: 1600x900 min: 720x400
  Monitor-4: VGA-1 pos: center-l model: Lenovo L2251x Wide serial: <filter>
    built: 2011 res: 1680x1050 hz: 60 dpi: 90 gamma: 1.2
    size: 474x296mm (18.7x11.7") diag: 559mm (22") ratio: 16:10 modes:
    max: 1680x1050 min: 720x400
  OpenGL: renderer: NVC1 v: 4.3 Mesa 21.3.7 direct render: Yes
#

The NVidia cards are old and lower tier, and their heat sinks aren't very big, so
each fits in one slot, and doesn't require gobs of power.

You may notice the above inxi output is not from Debian. Neither Buster nor
Bullseye are able to find outputs on Device-2. On TW, all four are found and used
automagically.
-- 
Evolution as taught in public schools is, like religion,
	based on faith, not based on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

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#245934

Felix Miata wrote:

> It might be just right. I've read 30% headroom is a good
> idea

Okay, then it is, with +30% wiggle room at 87% efficiency,

  (ceiling (/ (* 1.30 (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8)) 0.87))

or 375 W :)

-- 
underground experts united
https://dataswamp.org/~incal

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#245938

On 05/03/2022 14:00, Emanuel Berg wrote:
> So I should get a passive 400W then.

My last attempt to build a completely silent PC with a standard desktop 
case and PSU failed because the passively-cooled PSU buzzed at very low 
loads (idle), *exactly* when I wanted it to be silent.

Kind regards,

-- 
Ash Joubert <ash@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand

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#245943

Ash Joubert wrote:

>> So I should get a passive 400W then
>
> My last attempt to build a completely silent PC with
> a standard desktop case and PSU failed because the
> passively-cooled PSU buzzed at very low loads (idle),
> *exactly* when I wanted it to be silent.

What about your attempt before that?

-- 
underground experts united
https://dataswamp.org/~incal

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#245945

On 05/03/2022 14:24, Emanuel Berg wrote:
> Ash Joubert wrote:
>> My last attempt to build a completely silent PC with
>> a standard desktop case and PSU failed because the
>> passively-cooled PSU buzzed at very low loads (idle),
>> *exactly* when I wanted it to be silent.
> What about your attempt before that?

I built several quiet PCs with various Antec cases and Noctua CPU and 
case fans. I am pretty sure that each used the PSU included with the 
Antec cases. The last build was 2009 I think, before I went fanless. 
Back in those days it was usual to have a PSU included with the case.

Kind regards,

-- 
Ash Joubert <ash@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand

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#245948

Tixy wrote:

> I had a similar problem with a new PC I got a year ago but
> I bought it ready made, so I replaced the PSU and got
> a refund from the original PC supplier. Thing is, I replaced
> the PSU with the identical model [1] as the reviews on
> Amazon didn't complain about noise, sure enough, the new one
> was silent

Haha :)

-- 
underground experts united
https://dataswamp.org/~incal

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#245949

On Sat, 2022-03-05 at 14:07 +1300, Ash Joubert wrote:
> On 05/03/2022 14:00, Emanuel Berg wrote:
> > So I should get a passive 400W then.
> 
> My last attempt to build a completely silent PC with a standard desktop 
> case and PSU failed because the passively-cooled PSU buzzed at very low 
> loads (idle), *exactly* when I wanted it to be silent.

I had a similar problem with a new PC I got a year ago but I bought it
ready made, so I replaced the PSU and got a refund from the original PC
supplier. Thing is, I replaced the PSU with the identical model [1] as
the reviews on Amazon didn't complain about noise, sure enough, the new
one was silent so the old one was duff (possibly some inductor not
wound rigidly or touching another component).

[1] SilverStone NJ450-SXL

-- 
Tixy

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#245940

>> It might be just right. I've read 30% headroom is a good
>> idea
>
> Okay, then it is, with +30% wiggle room at 87% efficiency,
>
>   (ceiling (/ (* 1.30 (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8)) 0.87))
>
> or 375 W :)

So I should get a passive 400W then. 375W - there worst-case
for everything at the same time - is

  $ echo $(( 375 / 400.0 )) # 0.9375

only 94% of that.

-- 
underground experts united
https://dataswamp.org/~incal

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#245900

tomas wrote:

>> Okay, but if I don't play games will the GPU still require
>> that much?
>
> You want to plan your PSU's maximum output according to your
> hardware's maximum input. Everything else will entertain you
> debugging obscure problems.

Indeed, the most robust approach ...

>> The GPU is a
>>
>>   msi Nvidia Geforce GT 710, 2GB DDR3, PCI-E2.0, HDMI+DL-DVI-D
>
> The Internets [1] say this one will take 19W maximum. But never
> trust the Internets :-)

That's so!? :O Well, that's nothing! (Well, it's 19 :))

Thanks a lot, that means the picture is complete!

GPU          geforce-gt-710          19
CPU          AMD mid end (4 cores)  125
fans          80 mm (3K RPM)          9   (3*3W =  9W)
             120 mm (2K RPM)         12   (2*6W = 12W)
motherboard  high end                80
RAM          ~DDR3 (1.5V)             3   (actually it is a DDR4)
SSD                                   2.8

(+ #1=(+ 19 125 (* 3 3) (* 2 6) 80 3 2.8) (* 0.25 #1#)) ; 313.5

https://www.buildcomputers.net/power-consumption-of-pc-components.html
https://www.techpowerup.com/gpu-specs/geforce-gt-710.c1990

-- 
underground experts united
https://dataswamp.org/~incal

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#245882

> but how do I know how many W I need for my computer use?

AFAIK this is done as follows:

Look at the doc for the various components of your machine (CPU, GPU,
motherboard, disks, RAM, ...), sum up the stated maximum power
consumptions (in case of missing data, you may google around for rough
estimates of power consumptions of devices in the same category), add
a bit of wiggle room, and that should give you the minimum number of
W that your power supply should be able to output.
If that's "too much" for you (e.g. it's too expensive, or such a PSU
doesn't fit in your enclosure, ...), then try to get as close as you can.


        Stefan

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#245884

Stefan Monnier wrote:

> Look at the doc for the various components of your machine
> (CPU, GPU, motherboard, disks, RAM, ...), sum up the stated
> maximum power consumptions (in case of missing data, you may
> google around for rough estimates of power consumptions of
> devices in the same category)

Good idea, I already tried actually but didn't find any huge
list, but did find this:

  https://www.buildcomputers.net/power-consumption-of-pc-components.html

But again, the GPU - if I don't play games, do I still need
the W for that, as high?

-- 
underground experts united
https://dataswamp.org/~incal

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#245890

> But again, the GPU - if I don't play games, do I still need
> the W for that, as high?

What happens if your PSU doesn't have a high enough wattage is that
things will work fine as long as your actual consumption is below the
PSU's limit but if for some reason you push the system beyond the limit,
then funny things can/will happen, including immediate shutdown, crash,
...


        Stefan

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