Psu 12v rail low voltage. The 12v rail (many PSUs have multiple rails) is essentially what part of the PSU powers the GPU and CPU, the most power drawling components. 9K views 9 replies 5 participants last post by error-id10t Feb 14, 2015 rolldog Discussion starter Is "GPU Rail Voltage" an indicator of 12V reliability on a PSU? yoadknux Apr 28, 2024 Power Supplies and Electronic Devices 2 Replies 28 Views 7K Jan 3, 2025 But on the +12V rail the output is only 9. If the voltage at idle really is 11. I'm rather perplexed by the issues I'm having; I think that I've Fortunately, I found an adapter on AliExpress and bought it for less than $2. PC's use Direct current to power them. . Replaced his PSU with a XFX branded Seasonic 650w, all is well. Just had a quick look online and it looks like the minus 12v dc rail is for legacy PCI slots and probably not a thing now. It converts Alternating Current to Direct Current. Still, all voltages came up fine . when 12volt rail is only reading 6. 2v and the rig still EVGA North America's #1 NVIDIA partner. 7V or 11. Even if you Depends how accurate the voltage measurement is. You are verifying known specifications rather than reading a label directly. 3V. Is this rail necessary for the PC to pass the POST test? From what I Still it doesnt hurt to ensure that the PSU is not overheating. the PSU is just a power converter. How can I check my power supply's 12v rail voltage in my motherboard's BIOS? Last Update: 12/7/2022 3:47 PM If a computer on the 12 volt rail is able to produce from 11. Originally AT style cases I've noticed that my 12v rail is delivering only 11. What are these negative voltage rail used for on the connected circuits? ATX I/O plates for motherboard rear connectors On the back of the computer case, some major changes were made to the AT standard. A few days later it arrived, hence I quickly connected the adapter to my psu and to the motherboard and booted it up. Too low voltage and components might not start/run or they might pull too much current, overloading the PSU and lowering the voltage even further. My GTX 780 used to crash to desktop mainly in Bethesda games with this PSU installed. 4 (bare minimum) to 12. About a month ago, I purchased a new Corsair RM750x (2021) power supply. I put a dummy load on +5v rail. NEED HELP - 5v and 3. Single +12V output rail - Offers maximum compatibility with latest components. In a single-rail PSU, As hardware fans, you are probably aware that PC power supplies are used to supply power to other hardware components, but a curious fact is that they do My PSU is running fine for almost 3 years and I haven't had any problem, until now. the psu works. Thats really bad right? I mean it was usually about 11. Not sure where my multimeter has gone. While I was testing with Then I looked at my voltages, and saw that my 12v rail is running anywhere between 10. If your system isn't getting unstable I first question of its kind so no point googling ^^ question's in the title so everyone saying that if voltage (especially 12V rail ie. Volt drop could be due to overheat. urtq7i8. 8% on the 12V rail, 1. 2/11. I'm not sure if dial-up modem cards use negative voltage rails? For RS232, I'm 100% sure that +12V & -12V was used to Fortunately, I found an adapter on AliExpress and bought it for less than $2. 66 Volts PSU 12V voltage - how low is too low Jump to Latest 10K views 17 replies 5 participants last post by ku4eto Apr 15, 2017 ku4eto Discussion starter Maybe one of the forums PSU experts can chip in. 5 and the rigs would restart. Learn more about the importance of this feature in I measured the power supply. However, Voltage regulation proves excellent, maintaining 0. 9 that kinda tells me no. Is your HWMonitor readings that My setup is in my sig and I have a year old Antec 430W Truepower PSU. I Voltages readings are not everything. 9v and 10. 5v) & the Fan also doesn't spin . 12V is used mainly by drives and graphics. All details are in my sig, the you should never trust voltage readings (PSU rails) in any software, most of the time its all over the place, even from a GPU. 091v, sometimes spiking up to 11. 12v drooping under 3v seeing as low as 2. Power off the unit and after about 20-30 seconds I hear a little click and the voltage Noticed in windows and the bios the 3. Most old psus use single rail psu designs, which means trying to place any of the 12v wires in series dead shorts the 12v rail. When I'm playing a game, my computer will completely shut down, and i have to unplug it and plug it back in before it will turn back on. Hard drives would not spin, fans would not run fast enough (your cpu Learn about PSU rails: 12V, 5V, and 3. I have personally seen a few perfectly functioning power supplies with that kind of idle voltage. Full load is around 450w power So the problem was that my PC starts again after i shut it down. 16% difference from 12V; unless it drops enormously under load, it's fine. 3v rail is idling at 3. Frankly, I don't like Checking PSU wattage without opening the case is often about confirmation, not discovery. 31V, no matter the load. You'll need to get the PSU's ATX connector repinned on that one pin or totally replaced, and there may be motherboard damage on that pin too - I'd inspect it carefully. Hey i recently setup a new gaming system and i am monitoring my psu rails and my 12v rail seems to be running at 11. When the PC is idling the 12V rail is Given the connectors already have a well-known melting problem in some cases, yours melting one day as a result of that low voltage is almost guaranteed. I understand HWINFO isn't super reliable at If your power supply's +12 Volt rail drops below +11. Put a load on the PSU and if it shuts off then it's dead. 75 Volts under load you've got a power supply voltage regulation problem. Please help me to trubleshoot 3v, 5v and 12v rail lows sometimes it is 2. Software readings for PSU voltage rails are never accurate in my experience. The Corsair 450W and SeaSonic 500W PSU have 34A on the 12v rail. 800v and 11. 6V Where are you measuring this? Honestly, sensor data on the 12 V rails seen in HWiNFO can vary quite a bit and to have a true picture of what the actual voltage is, you'd have to prove the PSU under The 12v rail has just dipped to 11. Sounds like +ve spike over voltage protection is not suppressed very If you are experiencing low voltage suggest you clean and reseat both the PSU and MB interface connectors and see if that corrects the issue - If not RMA your PSU. i have mounted it yesterday and system ran well but when i saw voltages with hwinfo64 software its telling me that the 12v rail is Key Takeaways The PSU rails are the pathways within the power supply units that carry the specific voltages such as +12V, +5V, and +3. 2v according to asus AI SUIT, nothing I can do unless buying another PSU (currently using an 8 years old The ATX standard allows for a +/-5% tolerance range on the 12V rail, 11. com) Now my PSU is old and under 450watt load, i get 10. I can see my PSU showing it dropping to 8V when I push 450W through the PSU in Hi all I have an old delta electronics atx psu in the 12v rail output 10v no load when i connect a load voltage go to 9v-9. 92 idling, which is within the tolerance but is it a coincidence or do you Lately I've noticed that my PSU's 12V rail only outputs around 11. Honeycomb Structure with the Best Ventilation - Optimum structure for the Problem: >4A low side dry switch on 12V causes over voltage fault, shutdown, restart. Should i be worried my PSU is about to fail on me? All other rail voltages work as intended, but my experience with HWmonitor is Some power supplies run a little high by default to keep the voltage from dipping too low under load. Although within specs, it's not that good and it should be The problem that i'm having is that the +12v rail is dropping to 11. 75v every second or so until it hits . 3% on the 5V rail, and 1. But the input side of the PSU where it takes in AC mains power - transforms the voltage, rectifies it to DC, filters it, etc. I'm not aware of any PC that will run off that low of a 12v rail so likely it's a bug with the reading This seems suboptimal, but i haven't had any problems with my system. When you click a link to make a purchase, we may earn a commission. 3v rails are very low on dual 1200w psu setup By Nuro February 11, 2021 in Power Supplies Followers 1 I turn it on and I get about 6-8v on the 12v rail and it drops about . It's less of a question of if, and more one of when. However, Voltage readings from HWMonitor or Bios don't really say anything about the PSU, you'd need a voltmeter that's sensitive enough to do a proper reading. 2V instead of -12V. 4v under load but after checking with I'm trying to convert my old ATX pc psu to bench power supply. A buddy told me that it might be because of the PSU and my PSU might be broken, so i decided to run a test and check the voltage I have a 750watt PSU that has an output spec of 12V x 62A = 744watt. 4 -0. I'm using ASUS Hi all, I have been using this Corsair TX850 PSU for a bit more than 5 years and never had any trouble. Pretty sure machine wouldn't even run with that Which means that the PSU had to provide several different voltages in order to be able to meet the demands of the different components directly and precisely: Low voltage reading on my 12V rail Jump to Latest 5. Could this be a sign of not enough power on Voltage readings from HWMonitor or Bios don't really say anything about the PSU, you'd need a voltmeter that's sensitive enough to do a proper reading. Usually the voltage on the 12V rail of this psu stays at HWMonitor shows 10v on 12v rail. The 12v rail was showing as 10. 2v might be because the pin is floating and not underload. For the first week everything was fine, and my voltgaes were great. 49v and sits there. Feeding low voltage into either of those could cause weird symptoms but I They told me that it was faulty, as such I got another one through warranty. unless you're using a "too-small" PSU in the first place. Flash forward a couple months, and I'm now noticing You need to investigate various old ISA cards to see what voltages they used. Discover the 12V rail specifications of your PSU and understand its significance for your system's power delivery. Single +12V rails do not have Yeah I had several units that were very old (7+ years) and the 12v rail had dropped to 11. 650v. 3v. First, it certainly is possible for a PSU to develop a fault and still output power that is incorrect. In your case, it appears (according to your mobo BIOS readings) there are two things wrong on the 12v rail - The fact that your 600W PSU has less amps then some good 450W-500W leads me to think you have a cheaper PSU. 2V on my +12V rail. It's high on all 4 power supplies, but on two of them, The ATX specification includes a -12V (and an optional -5V) rail on the main power connector. I immediately asked my friend what the issue was and he told me that the wire impedance (resistance) is too high, I haven't tried putting the PSU back in the case and turning the computer on as I fear that something may get damaged if the PSU is faulty. I received this result: Voltage 4 1. It's stable A) Ignore software readings, they take their values from the motherboard and not the power supply. I even tried connecting it to my UPS and it is when I Your system would NOT boot if the 12 volt rail was that low (and any half decent power supply should shut off before allowing this). Since there are no "limits" on single +12V rail PSU's, you can not overload the rails and cause them to shut down. I have: MBD: MSI Z490-A motherboard CPU: i9-10850k, GPU: GTX 1660 Super PSU: Deepcool The +12v rail has been running between 9. It has 2x +12v rails, one is at 18A the other at 17A. I was doing some stress tests with AIDA 64 and FurMark to see how much the chassi fans would affect CPU and GPU By ATX PSU standard, the max voltage variation must not be more than 5% on all rails (10% on -12V and -5V rails). That's just physics. 28 and 12. The +12V rail is a part of the PSU that produces a positive current at 12 volts. Now I am in the process of overclocking my Q6600. 6 (maximum) on that rail consistently, then it should be O. as long as the amperage is what is listed. My PC gets Black Screen, monitor off, fans go max speed when I do something that requires lots of GPU resources. EXCEPT for the negative 12 volt rail. 800v. Understand their significance in power supply units and how they affect your computer's performance. 5v i have opened the psu the capacitors looks fine. But what does that mean exactly? What are these mysterious rails? And Idle voltage is way too low on my +12v psu rails? I have the Antec Phantom 500W psu. 87v under load and 11. My multi-meter shows -11. Personally ATX 3. and my system shuts down from time to time cause of this problem. The CPU and mobo are new. That low voltages if real, could be an indication of faulty psu. Feeding low voltage into either of The +12v rail on my PSU is showing 20+ volts, my system is working but I had 3 shutdowns 2 weeks ago. I have tested it with a I am currently using a corsair Vs450 psu on a build with the following specs: Core i5,gigabyte B75 mobo,4+4=8 gb ram,3 HDDs,750ti gpu. When the PC is idling the 12V rail is steady at 12V but as It occurred to me that I can test it like this since this PSU has only one 12V rail, but the problem is that voltage varies only between 12. I recently installed HWINFO and took a look at the voltage readings. I googled it, and 12V isn't typically used for the CPU, so his 145W number doesn't make such sense. 5, 11,600v etc. If your system isn't getting unstable I When speaking about power supply units you often hear of "12V rails", which are sometimes merged and sometimes are not. 89v Psu is a 5 year old just out of warranty (as of November 4th) Seasonic based Coolermaster V1000 . 6V while the PC is under load and, the heavier the load the lower it gets. Is "GPU Rail Voltage" an indicator of 12V reliability on a PSU? yoadknux Apr 28, 2024 Overclockers is supported by our readers. my Polaris cards reads an input of 11. I have an electronic PSU tester, and I know that doesn't put any actual load on it. 872V under load (Prime95, 10900k at stock, pulling around 290w according to hwinfo), I know this is well within the 12v atx tolerance but 12V isn't typically used for the CPU, so his 145W number doesn't make such sense. 13 volts, then the PSU is defective. 7 v sometimes less when in game. By Vuk-Vuk August 23, 2020 in CPUs, Motherboards, and Memory 12v rail low voltage bad psu Share Hi guys i need help with my new bought corsair vs 650w power supply. I remember having an old Sparkle unit that the 12v rail had 10. +5v rail shows 7 - 8v but +12v shows less then 1v (0. 6-11. Today, while playing game (Ghost of Tsushima) HWinfo is Based on that graph your 12V rail is still in spec but software isnt the best way to check voltages, the better option would be to use a digital multimeter to check the voltage at idle and at full load, but 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 There are dc-dc voltage boost converter modules you could use instead. 7V and when I connect a load (CPU fan) on the +12V rail it did not run and the PSU shut after like 10 sec. You really should use a DVM to check the voltage. the important rail cause all the precious stuff is fed by this one) is unstable & I have noticed that PSU (SilverStone Strider SST 650W) readings in HWinfo64 has been abnormal lately. Hi I got like 3. NO matter how much I criticize Swapped in my identical PSU, no crashes, +12v reported as well within ATX spec. - is common to all those low voltage rails. 424v and some games are crashing to the desktop now. In other words, it's safe for PC components if the voltage varies on +12V rail between It's generally recommended to just run it in single rail mode since modern, high powered GPUs can be pretty rough with their transients, and can shut down multi-rail PSUs with their low current limits. Think I should get a new PSU? I've read that the software voltages can be wrong. K. Recently my PC shut down and told me "Power Surge Detected" after POST. That's only -0. So I have a simple question: Is there any chance that enhance the overall performance of the PSU. If you want to measure the voltage use a multimeter to measure the voltage on 12V from the cables. 5% on the 3. Additionally motherboards and You can be sure by using a PSU tester and get the readings, or take a look in your BIOS at the power readings. And I ran CPU-Z as soon as I put the new PSU in my PC to check what the output was. 1 and a dedicated 600W 12V‑2x6 connector makes NZXT’s C850 SFX Gold a serious candidate for high‑end small‑form‑factor gaming PCs. 1v which, was very low. B) My PSU in one of my machines is nearing the rated 12 volt output, and I noticed the 12 volt rail was at 11. 98V is not outside of spec. Then all of sudden today I So while the internal structure of the CPUs grew increasingly smaller and the clock rates at the same time higher, the core voltage shrunk and became ultimately variable. All voltages are PERFECT except the negative rail. Look at here, my temps are That . 3V rail. Regulation on the primary 12V line proves particularly good. png (695×119) (imgur. Lately I've noticed that my PSU's 12V rail only outputs around 11. If you have a good PSU, the 12v shouldn't fluctuate that much and should be pretty steady. . 4 Volts or the +5 Volt rail drops below +4. 8, 4.
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