Home > Power Supply > What's The Deal With Single Rail Power Supplies?

What's The Deal With Single Rail Power Supplies?

Contents

It is what it Is.... That means that a 12 volt rail is limited to 20 amps. All rights reserved.REDDIT and the ALIEN Logo are registered trademarks of reddit inc.Advertise - technologyπRendered by PID 13447 on app-414 at 2017-01-20 16:12:28.232438+00:00 running dc009a3 country code: DE. Myth 1: Only Single Rail Power Supplies Can Power Up High-end Graphics Cards! my review here

Assuming that two PSUs have the same total 12 volt capacity, you're better off getting a single 12 volt rail PSU than a multi 12 rail PSU. Veröffentlicht am 03.06.2014Not sure whether you want a single rail or a multi rail power supply? But ... It doesn't matter, at least not in the way 99% of enthusiasts think. http://www.overclock.net/t/761202/single-rail-vs-multi-rail-explained

Power Supply Rails Explained

Inverting Amplifier (Virtual ground current = 0) Non-inverting Amplifier (Virtual ground current != 0) Virtual Ground Physical Ground More information If you want more information you can read various application notes: Video card information How to select a video card How to install a video card How to troubleshoot video card problems The big fat table of video cards AGP compatibility for That should make my job easier in helping my local IT forum members in getting the information they need regarding PSU issues -the wonderful world of web URL linking. __________________ Intel Latest: Ranulf, Jan 20, 2017 at 11:11 AM Politics and News At what age does your body start to feel old Latest: HumblePie, Jan 20, 2017 at 11:11 AM Off Topic

EDIT: I was right about everything about maybe CPU - the full 8-pin connector draws from both 1 and 2, when split, it's probably only 2 that it draws from. For instance, the 411 is no longer a viable choice for an op-amp. The standard reasoning is that multi 12 rail PSUs provide more power at 12 volts than single 12 volt rail PSUs. Power Supply 12v Rail Amperage One reason to have multiple separate 12 volt rails is to improve the load regulation and noise on the rail.

The current limiters in the multi 12 rail PSUs apparently don't really improve safety but they can make your life miserable when building a high-powered computer. However, with high wattage units, >45A on the +12V (650W and higher) picking a multi-rail unit will provide you with an extra layer of protection. This will help a lot. I'm thinking of building a small cluster (for a college project), so I've been looking at power supplies lately (because I'm looking to use the smallest amount of power possible).

The common misconception is that a rail is a part in the power supply that provides power. Power Supply Rail Definition So let's get down to it. "Single rail power supplies are best!" "No, multi rail units, stupid. On 3 and 4 rail units the PCI-e connectors are usually on their own on rails 3 and 4.The storm silent does only have 1 6 pin PCI-e connector which is Originally posted by: jonnyGURU ...

  • You can change this preference below.
  • Join Date: Dec 2007 Location: Melbourne, Aus Posts: 67 Thanks: 0 Thanked 0 Times in 0 Posts No, just curious. __________________ e8400 @ 4.2Ghz | TRUE Black | 8GB OCZ Platinum
  • Companies that market by Viral Methods are generally viewed as marginal by folks that are truly enthusiasts.
  • Great series of explanation jonny, i vote for stickies.
  • You can see the complications of dealing with the "rail balancing" problem on this page.
  • Many more powerful cards require two 6-pin connectors.
  • First, no one is responsible for fact-checking power supply manufacturers besides journalists, and producers of no-name power supplies usually don’t make their products available for review.
  • In this instance, I'm referring to the traces on the power supply that the wires in the cables are soldered to, specifically the ones carrying +12V power.
  • IIRC, 12V2 was for CPU and 12V1 was for mobo/graphics.

Single Rail Power Supply Vs Dual Rail

In my analogy, the houses are the peripherals. https://forums.anandtech.com/threads/why-a-single-rail-power-supply-is-superior-to-multiple-rails.109569/ So there are no disadvantages to using a PSU with multiple +12V rails? Power Supply Rails Explained If the same platform is used, then the cost savings will be reduced part counts. #19 SerpentRoyal, Nov 21, 2007 jonnyGURU Moderator
Power Supplies Moderator Joined: Oct 30, 1999 Dual Rail Power Supply Definition As can be seen, there is no difference in the total amount of power delivered – in both cases, the graphics card load is being met.

Anmelden Transkript Statistik Übersetzen 249.380 Aufrufe 7.324 Dieses Video gefällt dir? http://hcsprogramming.com/power-supply/what-power-supply-do-i-need.php More resources See also Multiple 12V Rails solved Budget PSU Upgrade, 12v Single Rail VS Dual Rail solved 12v Rail Single vs Multipul Confused about multiple 12v rails on psu solved They CAN, but what makes you think they DO? You also receive more SATA and peripheral connectors, is a boon if you have a tendency to use a lot of hard drives or internal cards. Dual Rail Power Supply Schematic

That can reduce the likelihood that a short will cause a fire or destroy something. In the non-server, enthusiast/gaming market we don't see this anymore. And then, there are PC power supplies. get redirected here Since this is merely a PC PSU rather than a "real" one, the manufacturers often don't feel obligated to tell you which connector is hooked to which rail.

Rosewill Xtreme 850W: Four +12V rails @ 20A each. 4 x 20A = 80A. 80A * 12V = 960W. Dual Rail Definition Suppose that you are building a computer which when fully loaded has a CPU which draws 9 amps at 12 volts and two video cards which draw 10 amps apiece at Because if they did, that would trap a lot of potential power and in that case what PCP&C's marketing would really hold water.

Obviously, you’ll want to research your build and make sure you buy a power supply with the connections you need.

Single +12V rails do not have better voltage regulation, do not have better ripple filtering, etc. In these situations you really do need an extreme power supply – but most people reading this aren’t running 12 hard drives, twin GTX 680s and a heavily overclocked Core i7-3770K. Ideally, you'd want to open that PSU up and solder down another pair of PCIe connectors to the rails the existing PCIe connectors are on, but alas... Dual Rail Power Supply Wiki All they're doing is limiting how much amperage is delivered to anyt particular connector or connectors.

The real issue is whether the power supply provides enough total current at 12 volts (as well as the other rails) and not whether it has multiple 12 volt rails. The power supply should also have a maximum combined +12 Volt continuous current rating of 38 Amps or greater and have at least one 6-pin and one 8-pin PCI Express supplementary The fact that there's a high success rate connecting the 12 volt rails strongly suggests that they're actually current limited 12s rather than independent 12s. useful reference PCP&C myths are marketing and should not be quoted as fact.Click to expand...

I just bought a PSU yesterday before reading this. Reply Trey Mahon August 1, 2012 at 2:46 am Thumbs up! The single 12 volt rail PSUs cause less problems. You can have two power supplies that are 99% identical and one be single rail and one be multi.