Voltage is the measure of electrical current. This tag should only be used when asking questions related to powering computers and peripheral equipment. It is not for asking about voltage issues related to the commercial supply of power to your home or office.

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27
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2answers
1k views

How does Windows detect battery issues?

I have a laptop that's a little over 5 years old, and I've never changed the battery, so I believe Windows 7 when it tells me "there is a problem with your battery", and to consider replacing it. My ...
11
votes
4answers
359 views

Got shocked by a native dell laptop charger outputting 19.5 V 6.5 A DC. It was REALLY uncomfortable, but was that dangerous?

Okay. My laptop was running out of battery. I grabbed my charger (outputting 19.5 V 6.5 A DC) which was plugged into the wall, and as I touched the end of the charger I got some electric shock going ...
11
votes
4answers
13k views

Is it better to use an offset or manually set CPU voltage (with respect to CPU longevitity)?

The Background: I recently built a new computer, and I'm working with the ASUS P8Z68-V Pro motherboard and Intel i7 2600k processor. While this question does not pertain specifically to my hardware, ...
10
votes
2answers
36k views

Hooking up my power switch/reset switch/LEDs

I'm working on building a computer (first time for me). There are several plugs that I need to connect to the motherboard (Power LED, reset switch, etc). Of the two wires, they are either: Color ...
9
votes
3answers
3k views

Can I have too high a PSU power rating?

I have just ordered a 650 W PSU for my computer which previously had a 300 W, in order to install a more powerful graphics card. However, I didn't check whether anything would blow up ...
8
votes
1answer
8k views

Charge Apple computers bought in USA to use in Europe

I bought an Apple MacBook in the US and would like to use it in Italy. On the cable, it says: 2.5A 125V. What are the possible solutions to charge my computer? Use an adapter, a plug converter or an ...
8
votes
1answer
1k views

I have a 3.3 Volt PCI ethernet card working on a 5 Volt PCI slot. How is it possible?

This is the design for PCI slots: As you can see, there are 32/64 bits and 3.3/5 Volts. For what I know: 32 bits PCI cards can work in 64 bits slots of the same voltage. 64 bits PCI cards ...
6
votes
1answer
2k views

What are good values for PSU voltages?

I have an odd computer I'm trying to fix that will crash only during the setup of an OS(crashes on every OS I've tried so far) It's not overheating and it is stripped down as much as possible and I've ...
4
votes
2answers
5k views

How to optimize PLL voltage

I am overclocking my Core i7 (Ivy Bridge 3770K), aiming for a moderate overclock. Currently I have it easily stable at a pleasant 4.4GHZ - BCLK defaulted at 100.00MHz, with the multiplier set to x44. ...
4
votes
1answer
6k views

Is it safe to use a laptop AC adapter with 220V power if the AC cable is not rated for 220V?

The AC adapter supplied with my laptop is designed to accept voltage in the range of 100-240VAC at 50-60Hz, but the AC cable that plugs into the adapter unit itself is only rated to 125VAC 7.5A 2.5A. ...
3
votes
2answers
698 views

CPUs: more transistors, less voltage?

I have read in an article that newer CPU cores have narrower circuit tracks so more transistors can fit in the core. The author wrote that since there are more transistors, the voltage is reduced. ...
3
votes
1answer
89 views

Are all DDR3L (1.35V) DIMMS safe to use in a computer system that uses DDR3 (1.5V) DIMMs?

The sales support of (the consumer/prosumer sales subsidiary of) a DRAM manufacturer answered a pre-sales question I made with (translated from an email in French): 1.35V Memory DIMMs are dual ...
3
votes
3answers
69 views

Can computer power supplies use North American 240V (hot-hot-ground)?

Simple question: Most computer power supplies are auto-sensing between 110V/120V and 220V/240V. This begs the question, can they use 240V in North America i.e. connected to both hots (red and black)?
3
votes
1answer
3k views

How do I change GPU core voltage?

I've got an AMD Radeon 6790 with Mint 14, and I'm experimenting with over-clocking the GPU for Bitcoin mining. Right now, I'm running it at 990/130 stable at stock voltage (I think 1.185V), but I ...
3
votes
1answer
539 views

Intel DH61AG CPU, fans, and voltages not reading in BIOS

I'm looking for the cause and/or fix of an issue when during start up of the DH61AG board the fans go full speed as they normally do but stay at full speed rather than slowing. In the BIOS the PC ...
3
votes
1answer
1k views

PSU voltage with multimeter

My PSU started making some noises even when the fans were stopped. I also had USB problems (two USB devices burned) so I checked the PSU voltages with a multimeter. I removed the PSU and connected it ...
3
votes
2answers
10k views

PC power supply & normal range for voltages reported in BIOS hardware monitor?

I'm trying to diagnose whether my computer has an ample power supply. Sometimes when I play a video-intensive game, both monitors lose the video signal, even though the computer remains on and sound ...
3
votes
1answer
221 views

Ever have bad voltage on an ethernet jack on a router/switch?

So I've got a bit of an odd problem I'm trying to solve. I have an ASUS RT-N66U router which has a desktop, xbox, and my brand new NAS directly wired into it. Whenever I hook the brand new NAS up ...
2
votes
2answers
740 views

Weird voltage issues - intermittent low 5V line

My computer has developed a strange ailment: when I turn it on, the 5V power line from the PSU is very low, hovering at around 4.2V. This is intermittent however, sometimes it jumps back up to 4.98V. ...
2
votes
2answers
1k views

Same voltage, different amperage for two power supplies

I've just plugged an 18.5V 6.4A HP power supply into an HP laptop; I normally use an 18.5V 3.5A power supply. Since the connector fit, I figured I'd give it a go... so far no funny smells or fires. ...
2
votes
2answers
2k views

My dlink power supply broke, I found a similar one on old boxes. Is it going to damage my router if used (specs and pic inside)?

I have an old dlink wi-fi router to connect old 802.11g devices at home. It's power supply just fried after a storm. Buying a new power supply is almost the same price as a used router like mine, and ...
2
votes
2answers
252 views

Turning on lamp pauses sound in my headset

I have my headset connected to my PC with USB. When I turn on my lamp on my table (fluorescent) the music from my headset pauses for about a second while the lamp powers up. Then it's back to normal. ...
2
votes
1answer
185 views

Is PSU voltage ripple something to worry about?

I'm currently putting together my first computer and I've had my eye on a Fractal Design Newton R3. From all of the reviews I've read this PSU comes out shining with the exception of voltage ripple on ...
2
votes
1answer
227 views

Does the power consumption for non-scaling processor vary from idle to busy?

Even though newer processors come with scaling (SpeedStep, Cool'n'Quiet), some computers have motherboards with outdated bios which do not support the feature. Thus, they run at full clock speed. Even ...
2
votes
1answer
271 views

Higher voltage requirement for lower clock frequency

Is there any reason for a CPU to require a higher Vcore to achieve stability when running at a certain speed, than the Vcore that the same chip requires for stability when running at a higher speed? ...
2
votes
2answers
213 views

Usefulness of multi-core in the context of power-efficient computing

I'm considering options for a new portable PC. I'd like to keep power utilization at a minimum, while being able to run batch jobs as quickly as possible. Batch jobs I can generally parallelize ...
2
votes
1answer
151 views

Using RAM stick with different voltage?

I would like to upgrade the RAM of my laptop. its a Toshiba Satellite L850 - 13D, Windows 10 , 64 bits, it has 2 slots for RAM, the one I have is 4gb, I don't know if I can add another one, but ...
2
votes
2answers
780 views

Mouse rating 1.5V | Can I use a 1.2V rechargeable battery safely?

My mouse rating is 1.5V, I've been using it with alkaline AAA batteries which provide 1.5V. My question is, if I have a 1.2V rechargeable battery, is it going to work anyways without issues? I'm just ...
2
votes
1answer
1k views

Can low voltage damage laptop or it's battery?

Sometimes I get very low voltage in my house. I am worried if I connect my laptop charger to the socket, will it damage the charger, battery or the laptop itself?
2
votes
1answer
2k views

Different RAM voltage

on my PC I have 2 kingston RAMs. The only difference is that one runs at 1,35V, the other at 1,5. As you can see frequency, latency and others doesn't change. My motherboard is an Asus K30AD_M31AD-...
2
votes
1answer
797 views

Do motherboards automatically set memory voltage?

Let's say I have a motherboard whose stock PC3200 DDR memory modules are fed a standard 2.6 V. I now replace them with performance sticks, which according to the manufacturer need to get the "...
2
votes
1answer
62 views

Motherboard is showing 24v instead of 12v

I have put together a new PC build and when I turn on the machine it's showing me the following error/warning: "Asus anti-surge was triggered to protect system from unstable power supply" Besides ...
2
votes
0answers
168 views

Under what conditions will a group-regulated PSU damage a modern computer?

These days group regulated power supply design is considered obsolete and is ideally avoided -- primarily due to the poor regulation under crossload. For example, Shilka pulls no punches here, and ...
2
votes
1answer
2k views

Which software to log voltage readings? [duplicate]

Possible Duplicate: What is a good tool to monitor my computer’s sensors? Utility for monitoring fan speed etc I need to test my windows system when playing 3D intensive games and would like ...
2
votes
2answers
138 views

Serious voltage and temperature problems

My computer has been acting up when I play games so I wanted to look into why. Issue 1: GPU Temp According to afterburner and speedfan my 8800GTX idles at 90 degrees and then when playing games ...
2
votes
2answers
470 views

UPS switches to battery power when plugging in devices?

Over the past week or so I've had my UPS switch over to battery power briefly when plugging in new devices (possibly limited to just AC -> DC chargers, but haven't tested anything else). I had ...
1
vote
3answers
5k views

Can I use 7.5VDC @ 1.0A on 6V @ 2.0A device?

Just what the title asks.... Can I use 7.5VDC @ 1.0A on 6V @ 2.0A device? Anyone know the answer?
1
vote
2answers
662 views

Using alternate rating laptop charger [duplicate]

I am using Sony Vaio and laptop charger burned its rating was 19.5V-3.9A, i am trying to find the same model but I have been only been able to find one with the rating 19.5V-4.7A. Can I use this, any ...
1
vote
2answers
1k views

Computer cables explained [closed]

I've noticed lately that places to learn about both power supply cables and also peripherals and fans aren't that easy to find. There's very little information available that gives detailed ...
1
vote
3answers
878 views

would I save power using a lower voltage power adapter? (on a modem)

from various experiences modems, access points, and other devices will often run fine even with power adapters of lower voltages (compared to their original power adapter). I am wondering if using a ...
1
vote
1answer
32 views

Laptop Power Supply Modification

I have an old laptop which I no longer have the charger for. I ordered a new charger for the same laptop series, but the plug is too large, and it is unlikely that I will find the same adapter (Acer ...
1
vote
2answers
3k views

Power supply bad with good voltage?

I am trying to drive out the reason I am having some hard drive "hard resetting link" error problems on a Linux Debian box. I am trying to eliminate the power supply as a problem in trouble shooting, ...
1
vote
1answer
1k views

Have a 40W power supply - will it power a laptop that needs 65W? (18.5v 3.5A (=65W))

Have a 40W power supply - will it power a laptop that needs 65W? I know that the basic calculation, voltage x amps = required wattage, so 18.5v x 3.5A =65W I realise that it should only draw the ...
1
vote
1answer
51 views

Are CPU voltage and RAM voltage related? What are the mutual constraints?

I was wondering if the maximum value of my CPU voltage range is a constraint on my RAM voltage. An example: My VID Voltage Range is 0.60V-1.35V and my memory modules are to operate at 1.5V. Am I in ...
1
vote
1answer
72 views

Does Laptop power supply matter? [duplicate]

I have a power supply which is 19.5V and 6.15A. My friends power supply or laptop probably broke and his power supply has a 19V and 6.32A. His charger comes with an adapter which fits my plug ...
1
vote
2answers
1k views

Can Current Backflow from Powered Hub's Adapter & cause PC Damage?

Getting this short: Can current flow from a powered USB hub's power adapter (lying 10 Meter away) back to computer via usb port and cause damage to Computer components like mobo, etc? What should be ...
1
vote
1answer
116 views

PC loading programs slower than normal after voltage change [closed]

I always turned on my PC at 220V, it always worked normally. Today I turned my PC at 110V and it was very slow to load any program. I turned it back on at 220V but it is still very low to load ...
1
vote
2answers
534 views

HDD is very slow after voltage drop

The HDD is Seagate Barracuda 7200.7 160 Gbytes Model ST3160023A. Of course it is not SATA. I once connected it to the USB via special adapter IDE-to-USB, and a separate power unit. The voltage drop ...
1
vote
3answers
2k views

Should I be concerned about this voltage reading (via SpeedFan)?

Been having computer issues. (My computer has been freezing the past couple of days, but in a rather odd manner: once it starts, each program freezes after a couple of seconds of being used. Note that ...
1
vote
1answer
37 views

GPU Voltage lowers after a few seconds of load?

I have a 650Ti, and I'm looking to overclock it. I'm using MSI Afterburner, and while I'm stress-testing etc. I have the logging graphs open. Under max load, with no overvolting, the default voltage ...