[SOLVED] Is 125w combined +3.3 and +5v enough? 5HDD and 2 D5 pumps

Kcimor

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Hello

So, i dont understand power supply rails.
Im looking to buy a 1000w psu (overkill but i want it), it can deliver almost 1000w on the +12v rails, but only 125w on the +3.3 and +5v rails combined.
Are those 125Watts enough for 5 HDD and 2 D5 pumps? Along with keyboards and other usb devices (wich i dont know if matter, im just guessing, thats why im asking)

Thanks
 
Im looking into these 2:
https://www.amazon.co.uk/gp/product/B075M8FH4C/ref=ox_sc_saved_title_2?smid=A3P5ROKL5A1OLE&psc=1

https://www.olx.pt/anuncio/nova-selada-evga-supernova-1000w-t2-titanium-IDEXidr.html

The thing is, i used to have a rm850x, and that psu has 150w on +3.3 and +5 rail, if these psus have higher wattage why not higher wattage on those rails? I dont understand anything about rails, but, do HDD run of those two rails when connected to the PSU or they take some power from 12v rail too?
Again, 5Hdd and 2 D5 pumps, i dont want to buy an expensive psu and then be short of power
Depending on the age of that RM850x it could be based on an older platform. Old computers used to use the 3.3V and 5V rails a lot more (look at the power distribution from this 2003 roundup https://www.anandtech.com/show/1124/4) (here is a picture from a new 2010 PSU https://images.anandtech.com/doci/3985/leistt.png notice for a 550W PSU the combined 3.3V & 5V is 140W). now the most power consuming components run off of the 12V rail.

For example a new HDD from WD the 10TB HC 330 has an operating wattage of 9.2W between the 5V & 12V rail. https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-hc300-series/data-sheet-ultrastar-dc-hc330.pdf

Right now the only things that run off of the 3.3V & 5V rails are HDD, SSD, fans, and DVD Drives. Your pumps are going to run off of the 12V rails.

The two PSUs that you listed are EXCELLENT models.

Seasonic review - https://www.jonnyguru.com/blog/2017/12/25/seasonic-prime-ultra-1000-titanium-power-supply/
EVGA review - https://www.jonnyguru.com/blog/2016/01/31/evga-supernova-850-t2-850w-power-supply/
 
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Hello

So, i dont understand power supply rails.
Im looking to buy a 1000w psu (overkill but i want it), it can deliver almost 1000w on the +12v rails, but only 125w on the +3.3 and +5v rails combined.
Are those 125Watts enough for 5 HDD and 2 D5 pumps? Along with keyboards and other usb devices (wich i dont know if matter, im just guessing, thats why im asking)

Thanks
That will be enough. What PSU are you looking at?
 

Kcimor

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Jul 17, 2013
79
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That will be enough. What PSU are you looking at?
Im looking into these 2:
https://www.amazon.co.uk/gp/product/B075M8FH4C/ref=ox_sc_saved_title_2?smid=A3P5ROKL5A1OLE&psc=1

https://www.olx.pt/anuncio/nova-selada-evga-supernova-1000w-t2-titanium-IDEXidr.html

The thing is, i used to have a rm850x, and that psu has 150w on +3.3 and +5 rail, if these psus have higher wattage why not higher wattage on those rails? I dont understand anything about rails, but, do HDD run of those two rails when connected to the PSU or they take some power from 12v rail too?
Again, 5Hdd and 2 D5 pumps, i dont want to buy an expensive psu and then be short of power
 
Im looking into these 2:
https://www.amazon.co.uk/gp/product/B075M8FH4C/ref=ox_sc_saved_title_2?smid=A3P5ROKL5A1OLE&psc=1

https://www.olx.pt/anuncio/nova-selada-evga-supernova-1000w-t2-titanium-IDEXidr.html

The thing is, i used to have a rm850x, and that psu has 150w on +3.3 and +5 rail, if these psus have higher wattage why not higher wattage on those rails? I dont understand anything about rails, but, do HDD run of those two rails when connected to the PSU or they take some power from 12v rail too?
Again, 5Hdd and 2 D5 pumps, i dont want to buy an expensive psu and then be short of power
Depending on the age of that RM850x it could be based on an older platform. Old computers used to use the 3.3V and 5V rails a lot more (look at the power distribution from this 2003 roundup https://www.anandtech.com/show/1124/4) (here is a picture from a new 2010 PSU https://images.anandtech.com/doci/3985/leistt.png notice for a 550W PSU the combined 3.3V & 5V is 140W). now the most power consuming components run off of the 12V rail.

For example a new HDD from WD the 10TB HC 330 has an operating wattage of 9.2W between the 5V & 12V rail. https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-hc300-series/data-sheet-ultrastar-dc-hc330.pdf

Right now the only things that run off of the 3.3V & 5V rails are HDD, SSD, fans, and DVD Drives. Your pumps are going to run off of the 12V rails.

The two PSUs that you listed are EXCELLENT models.

Seasonic review - https://www.jonnyguru.com/blog/2017/12/25/seasonic-prime-ultra-1000-titanium-power-supply/
EVGA review - https://www.jonnyguru.com/blog/2016/01/31/evga-supernova-850-t2-850w-power-supply/
 
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Elisis

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Im looking into these 2:
https://www.amazon.co.uk/gp/product/B075M8FH4C/ref=ox_sc_saved_title_2?smid=A3P5ROKL5A1OLE&psc=1

https://www.olx.pt/anuncio/nova-selada-evga-supernova-1000w-t2-titanium-IDEXidr.html

The thing is, i used to have a rm850x, and that psu has 150w on +3.3 and +5 rail, if these psus have higher wattage why not higher wattage on those rails? I dont understand anything about rails, but, do HDD run of those two rails when connected to the PSU or they take some power from 12v rail too?
Again, 5Hdd and 2 D5 pumps, i dont want to buy an expensive psu and then be short of power
I wouldn't recommend either for that kind of wattage, as both have only single rail 12v OCP. They aren't exactly the best options for wattages above 750W, and certainly not at 1000W. Right now I would recommend you look at something along the lines of Straight Power 11.
 

Kcimor

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Jul 17, 2013
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I wouldn't recommend either for that kind of wattage, as both have only single rail 12v OCP. They aren't exactly the best options for wattages above 750W, and certainly not at 1000W. Right now I would recommend you look at something along the lines of Straight Power 11.
Hi, i wanted to get a 80plus titanium psu
 

Kcimor

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Why? Either way, the only Titanium unit I feel confident to recommend for something like this is AXi. I'm fairly sure there are no other Titanium multi rail units.
Whats the problem with single rail?
I have a 80plus gold rm850x white, im selling it for 110eur and buying the seasonic for about 180. I want to buy it because i think its a nice deal, its on preorder for a lower price. Since i use the pc for long time i think investing in a good psu would be good, max efficiency and 12y warranty
 

Kcimor

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Also, if my 12 fans are running from sata power and not from motherboard power they will be running off the 12v rail? So i dont have to worry about my fans too
 

Elisis

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Whats the problem with single rail?
I have a 80plus gold rm850x white, im selling it for 110eur and buying the seasonic for about 180. I want to buy it because i think its a nice deal, its on preorder for a lower price. Since i use the pc for long time i think investing in a good psu would be good, max efficiency and 12y warranty
http://www.jonnyguru.com/forums/showthread.php?3990-Single-vs-Multiple-12V-rails-The-splitting-of-the-12V-rail
Essentially it allows lower OCP to be set, on multiple rails. That way you're not running 100A max or something on a single 12V rail, which is plainly dangerous.
 
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http://www.jonnyguru.com/forums/showthread.php?3990-Single-vs-Multiple-12V-rails-The-splitting-of-the-12V-rail
Essentially it allows lower OCP to be set, on multiple rails. That way you're not running 100A max or something on a single 12V rail, which is plainly dangerous.
That forum post is from 2008!!! Do you have any idea how much has changed in PSUs in the last 12 years? Your whole argument is ruined by the fact that the same site as your blog post Recommends those 2 PSUs. If they had issues with the 12V rail, it would be said.

That Straight Power 11 also only comes with a 5 year warranty, to me that means they don't think it will last the test of time. PSUs of similar quality from SeaSonic and Corsair come with 10-12 year warranties. Overall be Quiet makes good stuff but is a waste of money.
 
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Elisis

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That forum post is from 2008!!! Do you have any idea how much has changed in PSUs in the last 12 years? Your whole argument is ruined by the fact that the same site as your blog post Recommends those 2 PSUs. If they had issues with the 12V rail, it would be said.
Jonnyguru doesn't talk about multi rail at all in his reviews as they're aimed at (mostly) consumers. The article age indicates nothing, as well. Multi rail units should still be used for higher wattage models for reasons I outlined earlier. At least read the reasoning I gave.
 
Jonnyguru doesn't talk about multi rail at all in his reviews as they're aimed at (mostly) consumers. The article age indicates nothing, as well. Multi rail units should still be used for higher wattage models for reasons I outlined earlier. At least read the reasoning I gave.
I did read your reasoning as well as your link before I posted. However, the protections on modern PSUs make the need for multiple rails not needed.
 

Elisis

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I did read your reasoning as well as your link before I posted. However, the protections on modern PSUs make the need for multiple rails not needed.
Except that modern single rail OCP is set too high with high wattage units. It has to be. In the cases where a short happens, or anything like that, OPP will be too slow.

If you have multi rail OCP on 12V, the PSU can safely shut down earlier than just with OPP. This is more of an issue in higher wattage PSUs, as the OPP tripping point will be higher than on lower wattage PSUs. If something on the motherboard VRM fails, and 100A is drawn through the EPS connector, a 450W PSU would shut down. A 1200W single rail PSU would not.
 
Ah, brand loyalty. How delightful.
Not brand loyalty. I've read hundreds of PSU reviews from multiple different vendors. Seasonic is consistently rated very highly. That said Seasonic is not the only PSU I recommend. I've recommended Corsair, EVGA, Antec, Rosewill, and others to people. I personally have a Rosewill PSU in my desktop.

I base my recommendations on years of experience. I've been a system builder for 20 years, been reading about IT for almost 25 years, and am a VMware administrator. I don't have brand loyalty as I always do my best for price/quality/performance on everything I recommend.
 

Elisis

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I don't have brand loyalty as I always do my best for price/quality/performance on everything I recommend.
You literally just recommended Seasonic over BeQuiet only because you like Seasonic more. I would call that brand loyalty. The FSP model behind Straight Power 11 happens to be very good, but nah. Seasonic is always going to be better according to you.
 
You literally just recommended Seasonic over BeQuiet only because you like Seasonic more. I would call that brand loyalty. The FSP model behind Straight Power 11 happens to be very good, but nah. Seasonic is always going to be better according to you.
I like Seasonic because they make high quality PSUs. The Prime Ultra series is higher rated than the FSP BeQuiet PSUs. While FSP makes some good PSUs, they also make a lot of garbage ones. I'm not the only one on here with these ideas.

 

Elisis

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While FSP makes some good PSUs, they also make a lot of garbage ones. I'm not the only one on here with these ideas.
Have multiple sources which state that SP11 is indeed good:
The main reason I recommend it, again, is due to it having (properly configured) multi rail OCP. I've already addressed this.
 
Have multiple sources which state that SP11 is indeed good:
The main reason I recommend it, again, is due to it having (properly configured) multi rail OCP. I've already addressed this.
I never said that was a bad PSU. I said FSP makes some good and some bad. From the Anandtech review "The overall performance of the Straight Power 11 750W PSU that we reviewed today is by all means a good PSU, yet incapable of competing with the equally priced offerings of other manufacturers." Basically it is good, but you can either do better for the same money or equal for less money. That is why I wouldn't recommend it, the price/performance ratio isn't there.
 

Elisis

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"The overall performance of the Straight Power 11 750W PSU that we reviewed today is by all means a good PSU, yet incapable of competing with the equally priced offerings of other manufacturers."
And Andandtech doesn't quantify multi rail configurations, same with JG and Aris. But that doesn't mean it's important for higher wattage units. Actually, I don't know why JG didn't count multi rail OCP in his reviews. @jonnyguru?
 
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