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how do i actually size a psu instead of just buying the biggest one?

Solvedgaming-pcpowerpsu7 replies · 55 views · started
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Accepted solution by Rowan — lol same thing happened to me classic. on efficiency: teh 80 Plus tiers mostly affect ur power bill and heat, not stability. for a gaming…
  1. Kenji L.
    @klindqvist

    From experience: Im putting together a mid-range gaming build: an 8-core desktop CPU, a single graphics card in teh upper-mid tier, two NVMe drives, a handful of fans. The online calculators Ive tried land somewhere around 550-600W, but a friend insists i should get 850W "for headroom" and because GPUs spike.

    i dont mind spending a bit more if it actually matters, but Id rather understand the reasoning than just follow a rule of thumb... what should i actually be looking at when picking the wattage, and does efficiency rating matter much for a home machine?

    thinking

    3
  2. Rowan
    @silicon_probe
    Accepted solution

    lol same thing happened to me classic. on efficiency: teh 80 Plus tiers mostly affect ur power bill and heat, not stability. for a gaming PC that idles most of teh day, the difference between Gold and Platinum is small in money terms. id treat Gold as a sensible baseline and spend teh rest on a better platform rather than a fancier badge.

    logs will tell u more than guesses. worked for me anyway 🤷

    1 7 helpful
  3. Kai V.
    @thread_garage210

    @klindqvist what case are you using? Some small-form-factor builds need an SFX unit, which narrows the options a lot. lmk how it goes

    0 2 helpful
  4. Kenji L.
    @klindqvist
    in reply to @thread_garage210

    yeahhh i'm in a room that gets warm in smumer, so heat and fan noise do btoher me. the card needs two 8-pin PCIe connectors. no plans for overclocking beyond turning on the memory profile.

    2 0 helpful
  5. Clara B.
    @clara_early
    in reply to @silicon_probe

    yeahhh not sure i agree that brand doesnt matter. some manufactuerrs have a consistent track record with warranty service, and a 10-year warranty tells you smth about how confident they are. platform reviews are better, sure, but brand reputation is a decent shortcut when no detailed review exists. lmk how it goes

    0 10 helpful
  6. Kenji L.
    @klindqvist
    in reply to @silicon_probe

    @silicon_probe went with a well-reviewed 750W Gold unit with natvie cables for my card 😂 Leaves room for a GPU upgrade without being silly 🔥 Fan basically never spins up during games. Thanks for explaining teh transient thing, that was the bit i didn't get. worked for me anyway 🤷

    0 5 helpful
  7. Dev Olsen
    @devo153

    yeahhh start with the two big consumers, CPU and GPU, and look up their realistic sustained draw, not teh TDP marketing number. Add maybe 50-75W for teh board, drives, fans and USB devices. That's your steady-state load.

    then account for transient spikes. modern GPUs can pull well above their rated board power for a few milliseconds. A good unit handles that through its protection tuning, not just its label. that's why GPU vendors publish a recommended PSU size that looks gneerous.

    my rough rule: sustained load should sit around 50-70% of the PSU's rating, that keeps you in teh efficient part of teh curve, teh fan stays quiet, and transients have room.

    0 7 helpful
  8. Soren
    @sweber

    oh ive been there lol honestly teh quality of teh unit matters more than squeezing teh wattage right 🤦 A well-reviewed 650W with solid protections (OCP, OVP, OTP, SCP) will outlive a cheap 850W with questionable caps every time. Look for independent teardown reviews of teh specific model, since the same brand can sell very different platforms under one product line. lmk how it goes

    2 1 helpful

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