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

[Linux-Fan]

Emanuel Berg writes:

Unfortunately the motherboard was worst-case 166.2 W, not the
previous estimate/approximation at 80.

The 166.2 (motherboard W really doesn't include the CPU?)

It does, see
https://www.techporn.ph/wp-content/uploads/ASUS-ROG-Strix-B450-F-Gaming-Benchmark-1.jpg

which is from your reference iv and explicitly shows an AMD R5 2600X processor being used.

So no it says it is is worst-case 277 W, and with +30% wiggle
room it is 361 W :(

back to passive 400W I guess ...


  device  model/category                     max W   note               ref
  -------------------------------------------------------------------------
  CPU     AMD middle end, 4 cores             65     exact              [i]
  fans     80 mm (3K RPM)                      9     3*3W =  9W
          120 mm (2K RPM)                     12     2*6W = 12W        [ii]
  GPU     geforce-gt-710                      19     exact            [iii]
  mb      Asus ROG Strix B450-F Gaming AM4   166.2   exact             [iv]
  RAM     ~DDR3 (1.5V)                         3     actually, a DDR4
  SSD                                          2.8
  -------------------------------------------------------------------------

total:
  (ceiling (+ 19 65 (* 3 3) (* 2 6) 166.2 3 2.8))          ; 277 W

with +30% wiggle room:
  (ceiling (* 1.30 (+ 19 65 (* 3 3) (* 2 6) 166.2 3 2.8))) ; 361 W

[...]

[iv] https://www.techporn.ph/review-asus-rog-strix-b450-f-gaming-am4- motherboard/

[...]

May I suggest you to compute it differently as follows?

   device  model/category                     max W   note               ref
   -------------------------------------------------------------------------
   CPU     AMD middle end, 4 cores            130     2*65W              [i]
   fans     80 mm (3K RPM)                      9     3*3W =  9W
           120 mm (2K RPM)                     12     2*6W = 12W        [ii]
   GPU     geforce-gt-710                      19     exact            [iii]
   mb      Asus ROG Strix B450-F Gaming AM4    80     previous estimate
   RAM     ~DDR3 (1.5V)                        10     actually, a DDR4
   SSD                                          5
   -------------------------------------------------------------------------

What did I change:

* CPU power doubled to account for short-time bursts.
* Motherboard back to 80W which should still be a safe estimate.
* RAM upped to 10W and SSD upped to 5W (depending on the actual components,
  you might want to revert that but computing an SSD with 3W makes your
  entire calculation dependent on that specific model and if you upgrade
  that later you'd have to take it into account).

Sum = 130+9+12+19+80+10+5 = 265W.
With +30%: 265*1.3 = 344.5W



HTH and YMMV
Linux-Fan

öö

Hence it would be suggested to take at least a 350W PSU. Use a larger one if you ever plan to extend the system.

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