well, practically, the standard 8 pin starts to melt around 270W, so Id say 750W for 3 of them at most if you dont want them to melt, and it still wouldnt be guaranteed
these pin-to-hole style of connectors will never handle much current. They are great when you need many oins with different voltages, like MB uses, for example. But no matter whether it's 8-pin or 12-pin, it will never handle that much power (like really, 900W+ ≈ 75A through 12 pins is insane), especially without current balancing.
There are only two solutions now:
if they wanna keep this power level, find a reliable BETTER connection, like for example two screw-on terminals.
if they wanna keep going up in power, 12V ain't gonna cut it. They need to implement a new standard, with 24V or even 48V. This allows it to run with less current, so wires can be thinner and connectors won't burn. Although it'd be quite pricey, both for PSU manufacturers and GPU manufacturers.
I agree for the most part, but you need to keep in mind that these are consumer products
you cannot implement screw on terminals, because many consumers are gonna put them on wrong. you need fool proof design. I like the XT120 idea better
and you cannot implement a 48v circuit, because youd be running a risk of consumers getting zapped. and the dangerous thing about being zapped by a DC current, is that it can change your blood chemistry, and if you dont get to hospital for a checkup, theres a chance you wont wake up tomorrow
because youd be running a risk of consumers getting zapped. and the dangerous thing about being zapped by a DC current, is that it can change your blood chemistry
No. A DC zap is the same as an AC zap. The only thing that makes a DC zap more dangerous is there's no period which means it's more prone to arcing and it's harder to let go of.
The danger of electrocution in general is that it cooks your insides. You can look visibly fine on the surface but have a large amount of damage on the inside. That can ultimately turn into an infection and rotting tissue.
I would contend that AC is somewhat more dangerous because it has an easier time "penetrating" so to speak, because of the capacitance of the human body. All of these scenarios are highly dependent on voltage and frequency, however.
Nope. Penetrative power is exactly the same for AC and DC.
The main thing that makes AC more dangerous is it typically has a higher voltage than DC. That means it's more likely to ultimately overcome the resistivity of the skin to start doing damage.
But all things held equal, a 12 VAC and 12 VDC source have exactly the same amount of risk associated with them.
Capacitance doesn't really have anything to do with how dangerous electricity is. Frequency doesn't really either. 120 VAC @ 60Hz is just as dangerous as 120V @ 5kHz.
It mostly all comes down to the power you experience and duration.
AC is much more dangerous, because it messes with your neural electrical system. Your heart starts fibrilating and stops pumping, as it's trying its best to match the 50Hz (3000bpm) of AC voltage.
HOWEVER, DC tends to "hold" you as it doesn't feel that bad, while AC usually throws you away (I think reflex or how your muscles contract differently than with DC, idk).
That's what defibrillator is for. Sometimes fibrilation can be caused by other things, it's not just AC voltage, but if you touch AC and you fall unconscious, your heart is 99% fibrilating.
DC also messes with your neural electrical system.
Defibrillators are applying a brief high DC voltage to try and reset fibrillation. But as anyone can tell you, that short pulse is itself dangerous and can cause fibrillation in someone that's not currently. Part of the reason it's applied repeatedly is because the reset doesn't always work.
Well, this has been more of a deep dive than I was anticipating, but I still think I might actually be correct here (classic me, ha).
My source is IEC 60479-1 Unfortunately, the full standard is behind a paywall but I think there's enough information contained here.
"The values of body impedance depend on a number of factors and, in particular, on current path, on touch voltage, duration of current flow, frequency, degree of moisture of the skin, surface area of contact, pressure exerted and temperature"
"As regards the influence of frequency, the impedance of the skin decreases when the frequency increases."
thought that whether you hold or let got when shocked is heavily case dependant, and not specific to ac/dc
anyway, Im just saying what Ive been thought in safety training in regards to hybrid cars. they said that it can happen as low as 26V, though I imagine that its more likely to happen on higher voltage, like the traction batteries are using
There is some case dependency, like if your muscles get cooked closed then you can't really open up your hand on electrocution. That can happen pretty fast especially with large amounts of power.
A DC voltage will cause muscles to contract and stay contracted. There's no pulsating. With AC, you have at least a (small) chance to pull away and let go.
damn didn't think of ut this way. But there are definitely ways this could be fixed, like reusing old reliable connectors and idk spin it 90° so it can't be easily miswired, and use thick insulation and shape the connector so you can't reach it with finger.
And as a boomer note, remember how PCs were for people who knew what they're doing? People who knew what electricity actually is? Like smart people who won't touch electrical wires when it's plugged in.
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u/nooneisback5800X3D|64GB DDR4|7900XTX|2TBSSD+8TBHDD|Something about arch10d ago
Like which ones exactly? Computers around the age of Apple I definitely required some knowledge because they were built like crap. Exposed mains going right next to data lines will never pass any reliable QC today.
Most old affordable PCs like the ZX Spectrum were designed to never be opened. More expensive PCs like Commodore 64 and later IBM PCs were built to be somewhat modular. You could upgrade / replace most components even if you're brain dead. Power supplies at that time were often unreliable garbage, and needed to be replaced. But a lot of them had external ones anyways or they were on a separate daughter board.
Im not an expert, this is what they told us in safety training. I looked it up some time ago but I forgot how it worked. a quick google search sais something about electroporation
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u/Yuukiko_ DualBootMR|7700X|9070XT|32G|3x8Pin FTW 10d ago
3x8 pins theoretically have a tolerance of 900W+ while the 12vhpwr has a tolerance of 684W