New corsair AX850-AX1000 are only single-rail?

[17030644]

I see no corsair link support, and no switch on the back either. Even the label claims they're single rail PSUs

 

The question is: why?

 

Isn't multi-rail OCP cheap for a PSU that costs +$200?

 

And the RMi/HX/AX1600 do support multi-rail, while these 80+ titanium units don't

[jj9987]

Corsair Link is only on models that have i in it.

I'd rather ask, what difference does it make if a PSU is single-rail or multi-rail other than cost.

[seon123]

2 minutes ago, jj9987 said:

Corsair Link is only on models that have i in it.

I'd rather ask, what difference does it make if a PSU is single-rail or multi-rail other than cost.

And what difference does OPP, OTP, minor rail OCP, UVP, OVP and SCP make, other than cost? It's about safety. 

[jj9987]

1 minute ago, seon123 said:

And what difference does OPP, OTP, minor rail OCP, UVP, OVP and SCP make, other than cost? It's about safety. 

Under-voltage, over-voltage etc are pretty clear from reading. Single rail vs multi rail is not, so please, educate me. Which one is safer and what makes it safer?

[Enderman]

There really isn't a need for multiple rails these days if the power supply is designed properly.

OCP, OVP, SCP, etc all work with a single rail, there is no need for two rails.

[seon123]

19 minutes ago, jj9987 said:

Under-voltage, over-voltage etc are pretty clear from reading. Single rail vs multi rail is not, so please, educate me. Which one is safer and what makes it safer?

Let's say a catastrophic failure in the motherboard causes a load that draws 1100W from just the CPU 8 pin connector. With a single rail PSU, nothing will happen. It'll happily provide that, melting stuff and causing lots of damage. If that happens to a PSU with multi rail, it'll shut down. 

Like what didn't happen in this case. 

https://www.overclock.net/forum/31-power-supplies/944707-why-single-rail-not-better-than-multi-rail.html#/topics/944707

12 minutes ago, Enderman said:

There really isn't a need for multiple rails these days if the power supply is designed properly.

OCP, OVP, SCP, etc all work with a single rail, there is no need for two rails.

Multi rail, just like the other protections, is for when things go wrong. See the link above. 

Edited January 23, 2019 by seon123
Something something

[Enderman]

4 hours ago, seon123 said:

Let's say a catastrophic failure in the motherboard causes a load that draws 1100W from just the CPU 8 pin connector. With a single rail PSU, nothing will happen. It'll happily provide that, melting stuff and causing lots of damage. If that happens to a PSU with multi rail, it'll shut down. 

Like what didn't happen in this case. 

https://www.overclock.net/forum/31-power-supplies/944707-why-single-rail-not-better-than-multi-rail.html#/topics/944707

Multi rail, just like the other protections, is for when things go wrong. See the link above. 

Your logic is basically that multirail has less wattage per rail so it would shut down earlier.

This was beneficial 10 years ago, but not anymore.

 

Modern high quality PSUs have individual protection per connector, so it doesn't matter how many rails the PSU has.

If more than 500W (or something else)  is drawn from an 8 pin EPS, or 8 pin PCIe, or whatever it will trigger the protection.

 

There is no reason to need multi-rail these days other than to keep the 3.3v separate from 5v, separate from 12v, and so on.

Which every PSU does.

There is no need for multiple 12V rails anymore.

[seon123]

4 hours ago, Enderman said:

Modern high quality PSUs have individual protection per connector, so it doesn't matter how many rails the PSU has.

Sauce?

[Guest]

 

4 hours ago, Enderman said:

Modern high quality PSUs have individual protection per connector, so it doesn't matter how many rails the PSU has.

If more than 500W (or something else)  is drawn from an 8 pin EPS, or 8 pin PCIe, or whatever it will trigger the protection.

 

You do realize that the Seasonic 760W in your signature does not operate this way, right?

 

[Enderman]

1 hour ago, seon123 said:

Sauce?

Google virtual rail, or per connector oc protection.

[Guest]

oh dear lord....

[Stefan Payne]

14 hours ago, 17030644 said:

I see no corsair link support, and no switch on the back either. Even the label claims they're single rail PSUs

The question is: why?

Because Seasonic and they don't really allow changes

13 hours ago, Enderman said:

There really isn't a need for multiple rails these days if the power supply is designed properly.

 

there really isn't a need for multiple breakers in your house these days if the power supply is designed properly.

You see why that makes little sense?

3 hours ago, Enderman said:

Google virtual rail,

I did, this was the result:

https://virtualrailfan.com

https://www.youtube.com/channel/UCOIkT9bq-1N2BvrsBjhNlag

 

I don't think that's relevant here...

 

3 hours ago, Enderman said:

or per connector oc protection.

Yes, something Huntkey did (more or less) with my X7-1200W (exception: Drive Connectors, they are together, IIRC with the ATX)

Besides them I haven't seen much of it.

 

YOUR Seasonic clearly doesn't have it.

 

Seasonic is rather known for beeing dishonest about the rails of the PSU and claim multi rail but true single rail with 8pin chip inside.

Or Single Rail and up to quad rail inside (look at the XFX 1250W Review on @jonnyGURU in this case, he even did the Review!!11)

[OrionFOTL]

13 hours ago, Enderman said:

Your logic is basically that multirail has less wattage per rail so it would shut down earlier.

This was beneficial 10 years ago, but not anymore.

 

Modern high quality PSUs have individual protection per connector, so it doesn't matter how many rails the PSU has.

If more than 500W (or something else)  is drawn from an 8 pin EPS, or 8 pin PCIe, or whatever it will trigger the protection.

Oh God, that is funny to read. I'll explain why you're getting all those Funny reacts.

 

First off, you're speaking about "modern high quality PSUs have individual protection per connector" as if every high quality PSU has that. Actually, that's just a Corsair thing. They have per-modular-connector protection on their "i-series" power supplies.

 

But that's just a detail. The main thing is: you're saying multi-rail isn't needed, because some PSUs have per-connector protection.

Guess what is this protection called. How is it done?

Yes... you just described multi-rail. Multi-rail with one rail per connector.

 

 

 

Also,

13 hours ago, Enderman said:

There is no reason to need multi-rail these days other than to keep the 3.3v separate from 5v, separate from 12v, and so on. 

Multi rail was never about separating different voltages from each other, and I'm pretty sure nobody in this thread has any idea what you could possibly mean here.

[Enderman]

8 hours ago, Stefan Payne said:

I did, this was the result:

https://virtualrailfan.com

https://www.youtube.com/channel/UCOIkT9bq-1N2BvrsBjhNlag

 

I don't think that's relevant here...

Good job, you literally have no idea how to use a search engine. Next time try adding the other relevant information like 'psu'.

 

5 hours ago, OrionFOTL said:

Also,

Multi rail was never about separating different voltages from each other, and I'm pretty sure nobody in this thread has any idea what you could possibly mean here.

[17030644]

11 hours ago, jonnyGURU said:

oh dear lord....

Do you happen to know what was the reason to make those PSUs single rail?

 

or is it because it's Seasonic prime titanium design (which is a single rail PSU) and either the supervisor IC doesn't support such mode or they just didn't hesitate to implement multi-rail OCP just like they didn't with most Seasonic psus?

 

On 1/23/2019 at 9:55 AM, jj9987 said:

Corsair Link is only on models that have i in it.

I'd rather ask, what difference does it make if a PSU is single-rail or multi-rail other than cost.

well, not really. HX 2017 and vengeance models also support multi-rail mode.

 

In case of the HX you have a switch placed right where the modular connectors are to toggle between monorail and multirail.

On 1/23/2019 at 10:01 AM, jj9987 said:

Under-voltage, over-voltage etc are pretty clear from reading. Single rail vs multi rail is not, so please, educate me. Which one is safer and what makes it safer?

multi-rail is essentially splitting the 12V signal into multiple 12V rails with OCP (over current protection) on each rail.

 

So that if there is a short causing current to increase indefinitely, whenever the amperage surpasses the limit set by the OCP the PSU shuts down to avoid too much current going through a wire, which could potentially melt stuff and even cause a fire. 

 

I'm not gonna explain the whole thing, more info can be found here:

 

http://www.jonnyguru.com/forums/showthread.php?t=3990

 

https://www.overclock.net/forum/31-power-supplies/944707-why-single-rail-not-better-than-multi-rail.html

 

 

 

[Guest]

3 hours ago, Enderman said:

Good job, you literally have no idea how to use a search engine. Next time try adding the other relevant information like 'psu'.