91–100 of 188 posts
Makes sense. Should have happened long ago. All those old voltages date from when +5 from the power supply was used directly by the logic. Facebook's Open Compute rack delivers only +12 to the boards and drives, and that's from 2011. There's a power supply in the base of the rack that takes in three-phase AC or 48 VDC or whatever and puts out +12VDC. All other conversion is on the board. This is just catching up desk…
Earlier quoted context omitted.
I'm just waiting for electric vehicles and their technology to invade the van and RV market. It would be really cool to have a solar/battery powered vehicle you can power from DC. A bus-sized RV could easily generate 5kw from current solar panels just on it's roof. Current RVs do have both 110v AC and 12v DC systems, but they're not easily integrated. 12v is too low to power bigger stuff like air conditioners (1500 w…
I'm excited for the upcoming all electric Ford Transit! That's got E-RV conversion written all over it!
Rv parks and campgrounds will limit your pull from the mains and when someone starts pulling serious juice from their campsites they'll start auditing.
Four important things to consider: First, this already happened to some extent. Outside of drives and fans, the virtually all of the power used in your system is exclusively 12v; either from the 12v pins on your ATX24 or P4 or EPS12 connectors, or via the PCI-E connectors; very little non-drive or non-fan power is supplied via 3.3 or 5v rails. Second, almost all PSUs today use 12v DC to 3.3/5v DC converters to increa…
Only dominant in enthusiast land. ~20% of desktop but their server marketshare is still in the 5-10% range, with many analysts estimating below 5%. (Numbers from rumors of Mercury's next report, to be released soon). Likely to blow past Intel after the next hardware cycle. I'd guess 2021-22, since epyc zen2 launched in the end of 2019. Big players plan hardware on a multi year schedule (oem, vps/hosting).
Earlier quoted context omitted.
> Why does this still have 10 pins? 2 pins would be plenty. No, modern desktop can easily use up to 30A constant load. No way to provide so much over 1mm wires at 12V
10-gauge is rated for 30A, though that's 3.6mm.
Each individual terminal, formally called a Molex mini-fit junior terminal, is rated either 7.0A (typical for those with 2 contact springs) or 9.0A or 13.0A (for those with 4 contact springs.)
As you can imagine, most cheap PSUs and wire harnesses are made of terminals with 2 contact springs, so the three 12V wires on the ATX12VO spec allow a max of 3×7.0A = 21.0A or 252 watts.
As to voltage drop caused by resistance in the wire, it will be sufficiently small with 16AWG wire which will easily carry 7A over the short distances in a PC case.
12V makes so much more sense to be sending around - the losses at lower voltages are rough. It would be nice to replace legacy molex connectors with a more modern standard, however.
Four important things to consider: First, this already happened to some extent. Outside of drives and fans, the virtually all of the power used in your system is exclusively 12v; either from the 12v pins on your ATX24 or P4 or EPS12 connectors, or via the PCI-E connectors; very little non-drive or non-fan power is supplied via 3.3 or 5v rails. Second, almost all PSUs today use 12v DC to 3.3/5v DC converters to increa…
Based on my experience selling USB 3.0 PCIe cards, the ones that supply 5.0V directly off the PSU are more likely to maintain voltage at higher currents than ones with an on-board buck circuit. And it's one less part that can fail. I have not seen much in the way of stability issues either. The 5V from the PSU is clean enough and voltage drop is minimal at these currents over the standard 18 AWG PSU wires.
The ones that don't have audible issues either have their own VRMs on the boards or they have a sufficiently isolated 5v rail but still use PSU power. A good board should not have issues even under extreme cases. Neither solution is particularly more expensive than the other.
If I need to maintain voltage without droop under high load, I probably should be looking at legitimate chargers, not something powered off the computer.
Earlier quoted context omitted.
I agree it's delusional, but to give some hard data, Mercury Research published its quarterly findings on x86 market share as of Q4 2019[0]. Specifically: - On the server side, AMD market share is only 4.5% (up by 1.4 percentage point from last year) - For desktop, market share is 18.3%, up by 2.4 pp from last year. - For laptop, market share is 16.2%, up by 4.0 pp from last year. - For overall x86 chips, market shar…
> Maybe in 4-5 years, AMD will be the dominant player. But it's still too early to call them this. Highly unlikely. This is AMD's prime time because Intel screwed up, and they've peaked at 15%. I predict Intel to gain the pace in a few years and dominate the market once again.
It was bound to happen eventually, there has been a long trend towards point-of-use regulation displacing multiple output supplies. I'm just surprised they went with 12V, and not 19V which has lower rectification losses, less power loss to wire/trace resistance, and a large existing design ecosystem from laptops where 19V has been the norm for years.
Why does this still have 10 pins? 2 pins would be plenty. 12v Power, Ground, and an overlaid capacitively coupled 2 way data comms running at a few hundred khz to send and receive status messages, fan speeds, model/serial numbers, firmware/ temperatures, on/off commands, etc.
1 pin is called PS_ON, this shorting to ground turns it on. 1 called PWR_OK which says everything is working in some way I don't want to research. 1 +12V for stand by. 1 +12V sense for detecting voltage drop or something. And then 2 normal +12V and 3 ground. There is 1 reserved pin as well (rectangle connector so needs even pin count)
Four important things to consider: First, this already happened to some extent. Outside of drives and fans, the virtually all of the power used in your system is exclusively 12v; either from the 12v pins on your ATX24 or P4 or EPS12 connectors, or via the PCI-E connectors; very little non-drive or non-fan power is supplied via 3.3 or 5v rails. Second, almost all PSUs today use 12v DC to 3.3/5v DC converters to increa…
>First, this already happened to some extent. Fujitsu have been building PCs for a number of years with proprietary 12v-only PSUs, with SATA power being provided from an auxiliary connector on the motherboard.
Some SAS backplanes for cases that fit a bunch of drives sometimes have their own 5v VRMs and take only a standard 12v connector of some sort. Helps when PSUs typically don't supply enough 5v to feed a few dozen drives, but supply more than enough 12v.