Henning Follmann writes:
On Fri, Mar 04, 2022 at 06:36:35PM +0000, Andrew M.A. Cater wrote: > On Fri, Mar 04, 2022 at 06:47:14PM +0100, Emanuel Berg wrote: > > Alexis Grigoriou wrote: > > > > >> I've heard that for gaming you would want a 600~800W PSU
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> > motherboard, RAM and SSD are at most 232W. > > > > 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 > > > > (+ 125 (* 3 3) (* 2 6) 80 3 2.8) ; 231.8W > > > > The only thing left is the GPU, I take it even in that PSU
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> If your draw is a max of 230W and you use a 300W power supply, you've > still got to account for inrush current to capacitors as the machine is > switched on.> > A larger PSU in wattage terms may have better capacitors, more capacity to> withstand dips and spikes in mains voltage and may have a better power > factor so be more effective overall.> > the cost differential between 300 and 600W should be relatively small. > > Easier to overspecify: the other thing is that larger PSU wattages may have > quieter / better quality fans. I love almost silent PCs.
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And to add to that, most recent PSUs are very good in terms of efficiency. They are switched and drag much less power when the computer doesn't demand it. I would also go with a 600 W PSU.
[...]Please keep the following points in mind when doing PSU wattage sizing for modern PCs:
- Judging a CPU by its thermal design power is no longer feasible due to some CPUs permanently overclocking while the actually available cooling power permits it. On some Intel CPUs this can mean about twice the power than you would have expected. If we were to apply this logic directly to the unspecified (?) AMD CPU from the OP's config, it would mean adding 250W for the CPU rather than the 125W from its TDP. - 80+ certified PSUs are rated in terms of their performance at certain load percentages. If you choose a high-power PSU (e.g. 600W) then even if it has a high efficiency according to 80+ it will not necessarily be more efficient than a less highly rated 300W model.To summarize: For the use case, one might want to add the CPU's TDP "another time", i.e. 231.8W + 125W = 356W. Then choose either the next fitting PSU size (400W) or go slightly larger for extra safety e.g. 450W, 500W or even 550W would all be sensible choices.
HTH and YMMV Linux-Fan ΓΆΓΆ
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