Selecting a correct PSU for my case

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Selecting a correct PSU for my case

<!-- SC_OFF --><div class="md"><p>hi everyone! </p> <p>I am making my first modular rig, and looking at 84hp 9U case. I don't have a set of modules yet, but I created a hypothetical long term list which resulted in following specs: </p> <ul> <li>Power Consumption: 1393 mA +12V | 466 mA -12V | 160 mA 5V</li> </ul> <p>Now the case I want to buy has INTELLIJEL TPS80 power unit which has 80W and following specs: </p> <ul> <li>+12V output at 3000 mA, -12V output at 3000 mA, +5V output at 1500 mA</li> </ul> <p>This is clearly more than enough. Now in order to lower the price, case manufacturer is asking me if a weaker power supply will still suit me, in particular &quot;BoardPWR – small ´no HP´ power supply&quot; from konstantlab with 45W and following specs: </p> <ul> <li>+12V / 2A, -12V / 1.2A,+5V / 1.5A</li> </ul> <p>So for my untrained eye even this seems like sufficient for my setup. So I got two questions: </p> <ol> <li>Would this alternative PSU still be sufficient? Considering that I filled in my whole rack and it's still 70% usage at +12V. I don't want to have any power issues, so if TPS80 means better overall experience, i will go for it.<br/></li> <li>What effect does Wattage have in all of this? It's 90W vs 45W in those power supplies.<br/></li> </ol> <p>thanks in advance</p> </div><!-- SC_ON --> submitted by <a href="https://www.reddit.com/user/estrangedpulse"> /u/estrangedpulse </a> <br/> <span><a href="https://www.reddit.com/r/modular/comments/lkaq4e/selecting_a_correct_psu_for_my_case/">[link]</a></span> <span><a href="https://www.reddit.com/r/modular/comments/lkaq4e/selecting_a_correct_psu_for_my_case/">[comments]</a></span>