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do itx motherboards realy draw less power than atx? (answered )

BixxPlays
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hello I have been using the outervision psu calculator for years but i have an upcoming build and need advice. The outer vision psu calculator shows that itx and atx motherboards use different amounts of power is this true? all things being equal the same components attached to the board should be quite simiar power draw so i find it confusing that an itx system can draw so much less this doesn't seem right to me. any help clearing this up would be most helpful.

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1 minute ago, BixxPlays said:

hello I have been using the outervision psu calculator for years but i have an upcoming build and need advice. The outer vision psu calculator shows that itx and atx motherboards use different amounts of power is this true? all things being equal the same components attached to the board should be quite simiar power draw so i find it confusing that an itx system can draw so much less this doesn't seem right to me. any help clearing this up would be most helpful.

Not really and dont use PSU calc. What is the specs of the system?

 

CPU: i7 9700K@5ghz all core (silence + summer)

cache x47, AVX offset 0

Motherboard: Asus Maximus XI Hero

RAM: Patriot Viper Steel 2x8gb@3733mhz @jedec cl15

PSU: EVGA SuperNova 750 G3

Mon:  LG 27GL850-B, 144Hz Nano IPS - G-Sync compatible/Freesync

GPU: EVGA 1080ti SC Black Edition w/ G12 bracket

Sound: Odac + Fiio E09K

Case: Fractal Design R6 TG Blackout

Storage: MP510 960gb and 860 Evo 500gb

Cooling: CPU: Kraken X62 - GPU: Kraken X42(RIP) -> X53 (From RMA)

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Less expansion slots means less signal amplification stuff and less additional components on the board. But the difference is going to be negligible, especially in the days of 750-1000W power supplies that we exist in now. 

 

 

And yeah, PSU calcs are pretty much pointless. Just get whatever PSU your chosen GPU recommends and that's it. 

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@DoctorNickthank you for the quick responce its a ryzen 5700x with an nvidia a4000 i just notice that for some reason that calculator has a massive difrence in the power draw it shows spacififcly when looking at the 3.3 and 5 volt rails so was concerned as i will likely be using a silverstone flex atx powersupply because of space constraints

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@ZetZetyah i figured it should be barely any diffrence but as i said in my responce to DoctorNick i was concerned becaus smaller units ment for itx builds generaly have weaker 3.3 and 5 volt rails

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Very little in modern computers uses 3.3v and 5v. 

The RAM may be powered from 5v using a dc-dc converter ... a ram stick consumes maybe 2-3 watts, so if you have two sticks consuming 5w in total, that's 1A of current from 5v. 

 

The onboard audio and onboard network may be powered from 5v and 3.3v, but that's also just 1-2 watts each, at most. Chipset is powered from 5v stand-by and/or 5w, that's also  under 10 watts. Basic "rule" is if it only has a passive heatsink and you can hold your finger on it without burning your skin, that consumes less than 5-7 watts. The USB controllers are powered with 5v, so you get maybe 1-2 watts for the keyboard and mouse on 5v

 

The CPU and video card are powered by 12v. PCI-e slots do have 3.3v up to 3A (10 watts) available for video cards, but not all use all of that (maybe 3-5w for stand-by) besides around 65w on 12v 

 

 

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24 minutes ago, BixxPlays said:

@DoctorNickthank you for the quick responce its a ryzen 5700x with an nvidia a4000 i just notice that for some reason that calculator has a massive difrence in the power draw it shows spacififcly when looking at the 3.3 and 5 volt rails so was concerned as i will likely be using a silverstone flex atx powersupply because of space constraints

For that config a decent 500W is plenty.

CPU: i7 9700K@5ghz all core (silence + summer)

cache x47, AVX offset 0

Motherboard: Asus Maximus XI Hero

RAM: Patriot Viper Steel 2x8gb@3733mhz @jedec cl15

PSU: EVGA SuperNova 750 G3

Mon:  LG 27GL850-B, 144Hz Nano IPS - G-Sync compatible/Freesync

GPU: EVGA 1080ti SC Black Edition w/ G12 bracket

Sound: Odac + Fiio E09K

Case: Fractal Design R6 TG Blackout

Storage: MP510 960gb and 860 Evo 500gb

Cooling: CPU: Kraken X62 - GPU: Kraken X42(RIP) -> X53 (From RMA)

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thank you for your replys everyone i am going to end the thread here

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