combined 3.3v and 5v wattage

I was wondering how "serious" this combined load is.

I have a system specced out (i7-8700k, Z370 board, gtx 1060 6gb, 32gb DDR4, M2 & 7200rpm drives) and the psu calculator online has an estimated 109 watts for 3.3v and 5v combined.

I was really liking the Seasonic SSR-550RM G series 550w, it has more than enough for all the other amps and watts, but it says the combined max for 3.3 and 5 is 100 (short of the 109).

I'm no PSU expert, so I was wondering how hard of a line is this sort of thing? Should you always come in under this amount, or is there some wiggle room? I've read previously how the 3.3v and 5v are not critical with modern systems

psu calculator online has an estimated 109 watts for 3.3v and 5v combined.

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Seems very wrong to me. The CPU mainly draws from the 12V supply.

drescherjm said:

Seems very wrong to me. The CPU mainly draws from the 12V supply.

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Interesting, I don't know much so I would never know if something's off, but I used: https://outervision.com/power-supply-calculator

It gave me these recommended amounts for a PSU:

+3.3V: 10.0 A
+5V: 15.0 A
+12V: 26.1A

+3.3V & +5V combined: 109 W
+12V: 314 W

What are you adding as far as USB devices(5v) and such, those are what it raising the amps. More specific it's something that is 3.3v as with many things added I only get 3.9a on the 3.3v, your showing 10a on that. And I get 13.9a on 5v so that's about right

Even if you go up to 850w seasonic still has 100w for 3.3 +5v combined

I did notice that some of the evga and Corsair psus are a little higher

Speedeu4ia said:

What are you adding as far as USB devices(5v) and such, those are what it raising the amps. More specific it's something that is 3.3v as with many things added I only get 3.9a on the 3.3v, your showing 10a on that. And I get 13.9a on 5v so that's about right

Even if you go up to 850w seasonic still has 100w for 3.3 +5v combined

I did notice that some of the evga and Corsair psus are a little higher

Click to expand...

Ohh ok, I see. I trimmed the USB devices, went from 2 to 1 7200rpm drive, and cut out the PCI sound card out of the equation, and it goes from 109 to 93. I was padding the devices a bit in case of expansion. Trimming each one of those, one by one, lowered it each time.

Very interesting, I appreciate the info. I'll probably go with EVGA or Corsair just to play it safe.

a 550w unit can run a lot of stuff now...or idk get a big unit or start jumping dual booting units...