PS combined watts required for 3.3v/5v rails?

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PS combined watts required for 3.3v/5v rails?

Postby buckeye » 2018-3-08 @ 19:33

Pertaining to a Asus PB3-F/P3 850mhz-100/256mb/GF3/V2sli/Aureal Vortex2/30gb drive set-up? Have a 350W Thermaltake but the 3.3v/12v rails combine for only 120 watts, which I'm thinking won't be enough. Should I look for something along the lines of 180 watts?
Foxconn Q45M E8400 Core2 Duo 2GB DDR2 800 160GB BFG Geforce 7950GT 512MB 500W XP SP2
Asus P3B-F P3 850 512MB 40GB Hercules 3D Prophet II 64MB Voodoo2 SLI Aureal Vortex 2 400W 98SE
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Re: PS combined watts required for 3.3v/5v rails?

Postby Skyscraper » 2018-3-08 @ 19:43

Motherboard, memory and CPU ~30W
Geforce III Vanilla ~40W
2x Voodoo II lets say ~20W
HDD and the rest less than 30W on those rails for sure

I think it would work but I would get a better suited PSU anyhow.
Last edited by Skyscraper on 2018-3-08 @ 19:46, edited 1 time in total.
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Re: PS combined watts required for 3.3v/5v rails?

Postby dionb » 2018-3-08 @ 19:45

The CPU gets its power from the 5V line, as with other pre-P4 designs. 12V is only used for keeping drives spinning, so you really don't need much there. It should be fine. Let's turn the question around: *why* do you think 120W on 3.3V and 12V combined won't be enough?
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Re: PS combined watts required for 3.3v/5v rails?

Postby Skyscraper » 2018-3-08 @ 19:47

dionb wrote:The CPU gets its power from the 5V line, as with other pre-P4 designs. 12V is only used for keeping drives spinning, so you really don't need much there. It should be fine. Let's turn the question around: *why* do you think 120W on 3.3V and 12V combined won't be enough?


I think he wanted to say +5v and +3.3V combined. :)
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Re: PS combined watts required for 3.3v/5v rails?

Postby dionb » 2018-3-08 @ 20:39

Yes, it's a bit ambiguous between title and topicstart. If it's a low-end P4 style 350W PSU instead of a mid/high end Athlon style I see the challenge - but even so this should be fine, although you really want a PSU that delivers most of its current on 5V for a system like this. Good thing good early ATX power supplies aren't considered highly valuable collectibles yet (except perhaps amongst Antec fanboys ;) )
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Re: PS combined watts required for 3.3v/5v rails?

Postby buckeye » 2018-3-08 @ 22:55

dionb wrote:The CPU gets its power from the 5V line, as with other pre-P4 designs. 12V is only used for keeping drives spinning, so you really don't need much there. It should be fine. Let's turn the question around: *why* do you think 120W on 3.3V and 12V combined won't be enough?


The last board I had, the SE440BX-2 wouldn't boot with it, it only liked an 350w Antec only. I remember reading somewhere else that 180w was the threshold to look for, I'll try it out and post the results.
Foxconn Q45M E8400 Core2 Duo 2GB DDR2 800 160GB BFG Geforce 7950GT 512MB 500W XP SP2
Asus P3B-F P3 850 512MB 40GB Hercules 3D Prophet II 64MB Voodoo2 SLI Aureal Vortex 2 400W 98SE
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Re: PS combined watts required for 3.3v/5v rails?

Postby buckeye » 2018-3-08 @ 22:57

Skyscraper wrote:
dionb wrote:The CPU gets its power from the 5V line, as with other pre-P4 designs. 12V is only used for keeping drives spinning, so you really don't need much there. It should be fine. Let's turn the question around: *why* do you think 120W on 3.3V and 12V combined won't be enough?


I think he wanted to say +5v and +3.3V combined. :)


Oops, yer right, I stand corrected!
Foxconn Q45M E8400 Core2 Duo 2GB DDR2 800 160GB BFG Geforce 7950GT 512MB 500W XP SP2
Asus P3B-F P3 850 512MB 40GB Hercules 3D Prophet II 64MB Voodoo2 SLI Aureal Vortex 2 400W 98SE
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