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how many 12v rails does the power supply have

by Geovany Gulgowski Published 3 years ago Updated 2 years ago

A conventional dual rail ATX12V power supply has two 12 volt rails: 12V1 and 12V2. According to the ATX standard, 12V2 is the 12 volt rail which powers the CPU and is provided by the 4 pin 12 volt cable. 12V1 is the 12 volt rail used in all other power supply cables and powers everything but the CPU.

A conventional dual rail ATX12V power supply has two 12 volt rails: 12V1 and 12V2. According to the ATX standard
ATX standard
ATX (Advanced Technology eXtended) is a motherboard and power supply configuration specification developed by Intel in 1995 to improve on previous de facto standards like the AT design.
https://en.wikipedia.org › wiki › ATX
, 12V2 is the 12 volt rail which powers the CPU and is provided by the 4 pin 12 volt cable. 12V1 is the 12 volt rail used in all other power supply cables and powers everything but the CPU.

Full Answer

Are the 12 volt rails on a power supply 12s?

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. Moreover, the PSU reviews at XbitLabsactually open up the PSUs to have a look at the internal designs.

What is a power supply rail?

Power supply rails carry AC electricity from the wall and provide DC power to the cables on the power supply, you can find 12V 5V & 3.3V Traces. Most importantly, the +12V Rail provides power to the CPU and the GPU since they’re the most power-hungry components.

Is there such a thing as a multiple 12v rail unit?

To be clear: These REAL multiple +12V rail units are very rare and are all 1000W+ units (the original Corsair HX1000, Enermax Galaxy, Topower/Tagan "Dual Engine", Thermaltake Tough Power 1000W & 1200W, for example.) The original HX1000 is LITERALLY two 500W PSUs crammed into one housing.

How many +12V outputs does a power supply have?

There are a few units that actually have two +12V sources, but these are typically very high output power supplies. And in most cases these multiple +12V outputs are split up again to form a total of four, five or six +12V rails for even better safety.

What is the 12V rail on a power supply for?

A rail is simple a wire/path inside the PSU that carries electricity of a certain voltage. The 12v rail provides power for GPUs and CPUs, generally the two most power-hungry components.

How many rails does my power supply have?

To identify rails, look closely at the cables coming out of the power supply. While some manufacturers put actual labels on them for the multiple rails, most also put a stripe of different color on wires to identify different rails.

What does single 12V rail mean?

So what is a single-rail power supply? Put simply, the entirety of the +12v power source is monitored on a single circuit, monitored by an OCP chip configured to shut off if the power supply's max Amperage is reached.

How do I check my power supply 12V rail?

From Advanced mode, go to H/W Monitor, scroll to the bottom and find the voltage readings. If you see a "M.I.T" option select it and go to PC Health Status. Otherwise, go to Home and find the voltage readings on the right side. The 12v rail should read between 11.8v and 12.4v .

How do I know if my power supply is multi rail?

0:305:01Single Rail vs Multi Rail PC Power Supplies as Fast As PossibleYouTubeStart of suggested clipEnd of suggested clipQuestion a rail is just a fancy name for a PCB trace inside your power supply that the octopus wiresMoreQuestion a rail is just a fancy name for a PCB trace inside your power supply that the octopus wires are soldered to a single rail power supply has all of those external connectors essentially.

What is supply rail?

A power supply rail is a supply voltage that is provides power for electrical or electronic devices or components on a circuit board. Power supply rails used for early desktop computers included +/–5 volts (V) as direct current (DC), +/– 12 volts direct current (VDC), and a common or return line.

Do you need multi Rail PSU?

The answer is no, because single-rail PSUs have the same protective circuitry that multiple-rail PSUs do. When looking at the total amperage, remember that a when a PSU is installed into a PC, the current is spread across multiple cables. You have cables going to your motherboard, your peripherals, your GPU, and more.

What is a dual rail power supply?

A Dual power supply is a regular direct current power supply. It can provide a positive as well as negative voltage. It ensures stable power supply to the device as well as it helps to prevent system damage. Many electronic circuits require a source of DC power.

What is the difference between multi and single rail PSU?

A single rail means that the 12V that the PSU pulls from the wall is running through a single circuit. A multi-rail PSU on the other hand will have multiple 12V rails (pathways if you will) for different connectors.

What are voltage rails?

A voltage "rail" refers to a single voltage provided by the PSU (short for power supply - actually it stands for power supply unit). An ATX PSU has one 3.3 volt rail. It also has one 5 volt rail. The 3.3 volt rail has its own circuitry in the PSU which generates the voltage.

How do you test a power rail?

1:415:24Measuring Ripple and Noise on Power Rails - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnother way of bringing the signal on screen while keeping volts per division. Low is to use acMoreAnother way of bringing the signal on screen while keeping volts per division. Low is to use ac coupling on the channel.

What are motherboard power rails?

A computer's power supply converts AC power into several DC voltages (typically plus and minus 3.3v, 5v and 12v), each of which is known as a rail. The term comes from the power lines on motherboards. Power must be available throughout a motherboard; hence, voltage lines tend to run in long strips like railroad tracks.

How many amps can a 32A rail produce?

The 32A means the +12V rail can produce up to 32 amps. Most times the only thing in the system that uses that much amperage is the GPU. Depending on the GPU you are using depends on how many Amps it will need on the +12V rail.

What is a PSU rail?

PC's use Direct current to power them. The +12V rail is a part of the PSU that produces a positive current at 12 volts. This part is called a rail.

Do you need multiple rails for a power supply?

Don't worry about multiple rails. When a power supply truly has multiple rails ( and it's rare no matter what the marketing department says ) the rails are used as needed. As in power goes where power is needed and you don't have to worry about it. Ever.

Can a GPU draw on more than one 12V rail?

If the power supply has multiple rails, they may draw from different 12V rails, or the GPU can even draw on more than one 12V rail. 0. D.

What is a multiple +12V rail?

What is "multiple +12V rails", really? In most cases, multiple +12V rails are actually just a single +12V source just split up into multiple +12V outputs each with a limited output capability. This is what "OCP" is.

What is ATX12V?

A "modified" ATX12V specification that takes into consideration PCIe power connectors. One rail to the CPU, one rail to everything else but the PCIe connectors and a third rail just for PCIe connectors. Works perfectly for SLI, but not good for PC's requiring four PCIe connectors.

Is it cheaper to make a 12V rail?

It's actually cheaper to make a single +12V rail PSU because you forego all of the components used in sensing current, splitting up and limiting each rail and this may be one reason some OEM's will not split the rails, but say they are split.

Can you overload a 12V PSU?

Since there are no "limits" on single +12V rail PSU's, you can not overload the rails and cause them to shut down..... unless you're using a "too-small" PSU in the first place. Single +12V rails do not have better voltage regulation, do not have better ripple filtering, etc. unless the PSU is better to begin with.

What is a +12V rail?

You can often find the +12V rail split into multiple rails which divides the current (amperes) between them, which is seen as a safety feature. This is what multiple rails are at their essence, a safety mechanism made to prevent things from melting and or setting things on fire via Over Current Protection monitoring.

Is it safe to use multiple rail power supply?

However, multiple-rail power supplies have their benefits too being more safer for use with mid-high performance systems. In most cases, you will not trigger a trace to shut off your power supply unless you’re running multiple GPUs off a single trace.

Do you need to worry about a power supply?

In normal scenarios, you don’t need to care whether your power supply is single or multi-rail. And if your power supply happens to be a multi-rail unit, unless you’re running multiple graphics cards off the same rail, you don’t need to worry.

Does SCP matter if power supply is single or multiple rails?

Well, 99.9% of the time, it does not matter if your power supply is single or multiple rails. Most of the time, SCP (Short Circuit Protection) will kick in before things start melting due to too much current going through a rail.

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