Single or Multiple Rails PSU?

[Mattthev]

Hi,
do you use single or multiple rails PSU?
I have Corsair HX1200 and I can switch to both so I wonder which is better? Or which one you use?
I read that multiple is safer. Is that right?

[Vaccinus]

i use what is the default and on my rm 1000i is multi rail, multi rail is safer yes, it can spread better the wattage if you need it in multiple components, i heard somethign like this, single rail it's not used anymore, as there was some risky with it

[Billz007]

I have 2 HX1200i's and I use the default settings which is multi-rail.  You have a good power supply there.  I haven't had any problems with mine.  I run mine with a constant 1000w load. 

[Mattthev]

I have 2 HX1200i's and I use the default settings which is multi-rail.  You have a good power supply there.  I haven't had any problems with mine.  I run mine with a constant 1000w load. 

i use what is the default and on my rm 1000i is multi rail, multi rail is safer yes, it can spread better the wattage if you need it in multiple components, i heard somethign like this, single rail it's not used anymore, as there was some risky with it

Thx guys. So I will use multi too

[bdiddle]

Multi rail needs care with powered risers. Each rail is like a diffe[Suspicious link removed]u. You should make sure each card gets powered by only one rail. Mixing rails with slightly different voltage can have per flowing between rails.

I think......

[Mattthev]

Multi rail needs care with powered risers. Each rail is like a diffe[Suspicious link removed]u. You should make sure each card gets powered by only one rail. Mixing rails with slightly different voltage can have per flowing between rails.

I think......

But I have no idea how would I do that.
If I have molex PCIe risers how I could tell which one is same rail as PCIe 6 or 8 pin?
I'm now using single rail with no problems.

[bathrobehero]

Single rail all day. Otherwise you have to balance the load on the rails.

But it all depends on the PSU; one of my first 850 watt PSUs was single rail before I knew what that meant so it kept tripping with 4+ 60 watt cards due to the perihperal rail was tiny.

[Vann]

Researching multi-psu use I came across this post which specifies the best PSU's are DUAL CONVERSION PSUs that convert the entire energy into a 12V single rail. The cheaper PSU type use the 5V line to regulate the voltage, instead of the 12V line like the dual conversion models. That causes voltage instability from not loading 5V line. The EVGA G2 and P2 650W and up are dual conversion models.

https://bitcointalk.org/index.php?topic=1761303.msg17827649#msg17827649

[PanneKopp]

I prefer single rail mode because it minimizes voltage difference between the cards.