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Re: how many W a PSU for non-gaming Debian?

From Linux-Fan <Ma_Sys.ma@web.de>
Newsgroups linux.debian.user
Subject Re: how many W a PSU for non-gaming Debian?
Date 2022-03-05 20:30 +0100
Message-ID <DXIgh-6610-1@gated-at.bofh.it> (permalink)
References (1 earlier) <DXnvb-5TeE-3@gated-at.bofh.it> <DXoKB-5TV6-5@gated-at.bofh.it> <DXp3X-5U1Y-3@gated-at.bofh.it> <DXpwZ-5Urf-1@gated-at.bofh.it> <DXqt3-5V01-1@gated-at.bofh.it>
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Emanuel Berg writes:

> Linux-Fan wrote:
>
> >> Oh, the OP has the AMD4 x86_64 CPU that comes with/in the
> >> Asus ROG Strix B450-F Gaming motherboard!
> >
> > By default, a motherboard is just that, a motherboard.
> > Unless you have some specific "bundle" package, there is no
> > CPU included with it. According to
> > https://rog.asus.com/motherboards/rog-strix/rog-strix-b450-f-gaming-model/
> > the board has "AM4 socket: Ready for AMD Ryzen(TM)
> > processors". And according to
> > https://en.wikipedia.org/wiki/Socket_AM4 this socket can
> > accomodate for a wide variety of different processors.
>
> $ lscpu | grep "name"
> Model name: AMD Ryzen 3 3200G with Radeon Vega Graphics

Now this is _not_ a 125W CPU but a 65W TDP one [1]. When you calculate that  
CPU with 125W you are already safe. No need to multiply that *2 what I would  
have suggested were it a 125W TDP CPU. In fact, by calculating with 125W you  
almost took twice the TDP already which would have been 2*65W = 130W.

[1] https://www.amd.com/en/products/apu/amd-ryzen-3-3200g

> > (a) PSU with 450W will have specified 87% at 90W i.e.
> >     draw 90W/0.87 = 103W
> >
> > (b) PSU with 600W will have specified 90% at 120W i.e.
> >     draw 120W/0.9 = 133W
>
> Okay, so with everything and +25% wiggle room, i.e.
>
>   (ceiling (* 1.25 (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8))) ; 314 W

Use that figure, see above :)

> it is 314 W, and then the worst efficiency is 87%, the digit
> lands at
>
>   (ceiling (/ 314 0.87 1.0)) ; 361
>
> 361 W.
>
> ?

You do not need to take efficiency into account this way. Reason is: The  
efficiency is the factor between the wall power draw and the PSU's output  
power. To size a PSU for a new computer you _only_ take into account the  
output power and this is also the figure that the manufacturer advertises  
(i.e. 300W PSU means 300W output power, not input power draw).

The efficiency only comes into play when you want to consider the wall power  
draw e.g. to find out how much it will cost to run the systmem 24/7 in terms  
of electricity. If you take an "overly large" PSU, efficiency will possibly  
degrade compared to a one that is "just right" in size.

I hope that clarifies it a little.

HTH
Linux-Fan

öö

[...]

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Thread

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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