Question On Modern PSUs (ATX 12v Standards)
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The −12V rail was used primarily to provide the negative supply voltage to the RS-232 serial ports. That means the four +3.3V lines can carry 79.2W (3.3V x 6A x 4 lines), the five +5V lines can carry 150W, and the two +12V lines can carry 144W, for Although it is less likely, you may encounter an EPS12V power supply (used almost exclusively in servers), a CFX12V power supply (used in microBTX systems), or an LFX12V power supply (used Some boards don't even have PCI slots anymore. –Nathan C Nov 12 '14 at 14:21 Agreed that PCI slots are mostly obsolete on many systems, but your answer said
If you need to supply 15 amps you would either need to increase the wire gauge or use a second run of 18 gauge wire.I'm sure someone more knowledgeable can step The auxiliary power connector added no +12V, so yet another supplementary connector was needed. For a description of the potential problem, a 3.3V rail may have a 10A rating by itself (7001330000000000000♠33W), and the 5V rail may have a 7001200000000000000♠20A rating (7002100000000000000♠100W) by itself, but
Manufacturers like Apple are standing in the way. If yours doesn't and you need an adapter, you can purchase one from most online computer parts vendors or a well-stocked local computer store. Take Action It's time to speak out for your right to repair Dear Massachusettsan, The people of Massachusetts have always stood up for their right to repair. I'm thinking the old Enermax 430W PSU I bought to run a SlotA Athlon would be ideal.Now PSUs are basically a 12V unit with a few 5V and 3.3V feeds for
The 24-pin cable from the power supply connects to one end of the cable (the left end in this illustration), and the other end is a standard 20-pin connector that plugs It used to be used to power the RS232 serial ports, but most newer equipment can supply its own negative voltages internally. Hot Network Questions What is the difference between a hard link and a file? Cheap power supplies may have 10% or more ripple, which makes running a PC a crapshoot.
Newer ones are working as an input and output condition-controlled step-up converter, supplying a single 400V filter capacitor from a wide-range input source, usually between 80 and 240V. This connector defined in ATX specifications 2.02 and 2.03 and in ATX12V 1.X, but dropped from later versions of the ATX12V specification uses contacts rated for 5 amps. Power supplies designed for worldwide use were equipped with an input voltage selector switch that allowed the user to configure the unit for use on local power grid. At least two of Dell's business PCs introduced in 2013, the Optiplex 9020 and Precision T1700, ship with 12V–only power supplies and implement 5V and 3.3V conversion exclusively on the motherboard.
Power supplies capable of delivering more than 18A at 12V connect wires in groups to two or more current sensors which will shut down the supply if excess current flows. However, since most of the power is consumed by chips, the 5V rail still delivered most of the power. Some graphics cards may require this connector too. Retrieved 2014-10-11. ^ Oklahoma Wolf (September 14, 2007), The Bargain Basement Power Supply Rounup, jonnyGURU.com, retrieved 2008-01-31 ^ Rutter, Daniel (2008-09-27). "Lemon-fresh power supplies".
AnandTech. http://robotadv.com/question-on/question-on-hub.html At first this might seem like a bad choice but the reality is that on a modern computer 90% to 100% of the load is 12V. p.4. First, it reduces your electric bill.
Any departure from that may reduce system stability and shorten component life. A typical installation of an ATX form factor computer power supply. Browse other questions tagged motherboard power-supply atx or ask your own question. http://robotadv.com/question-on/question-on-sli.html That created a major problem.
April 2013. In older PSU designs, it was used to supply the voltage regulator, located on the low-voltage side of the transformer, allowing the regulator to measure output voltages. The two rails involved are labeled on the power supply with a combined amperage limit.
In Figure 16-9, for example, those extra pins intrude on the secondary ATA socket.
Second, wasted power is converted to heat inside your system. It isn't "tough" but it does require a little practice plus it is expensive to do just one connector because you will need a crimp tool. 1 tool for 100 connectors How PC Power Supplies Work Website with Information & Research on Active Mode Power Supply Efficiency How to Buy an Energy-Efficient Power Supply PC Repair and Maintenance: In-depth Look at Power In the past, +12V was used primarily to run drive motors.
ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.10/ Connection to 0.0.0.10 failed. Fortunately, these systems are now so old that they are no longer economically upgradable. Originally, a power supply featuring "multiple +12V rails" implied one able to deliver more than 20A of +12V power, and was seen as a good thing. http://robotadv.com/question-on/question-on-ram-mhz.html Other factors may increase that actual maximum amperage, so it's common to see 300W or 350W power supplies that actually draw as much as 8 or 10 amps maximum.
The first active PFC circuits just delayed the inrush. Just as load regulation describes the effect of internal loading, line regulation can be thought of as describing the effects of external loading; for example, a sudden sag in delivered AC One pin is left unused. 12V only System monitoring (P10): This is a 171822-8 AMP or equivalent connector carrying a supply to the PSU fan and sense returns. ATX12V 4-pin power Although the term is generally used in electronic engineering, many people, especially computer enthusiasts, encounter it in the context of personal computer power supplies.
Modern high-powered graphics processing units do the same thing, resulting in most of the power requirement of a modern personal computer being on the +12V rail. At first this might seem like a bad choice but the reality is that on a modern computer 90% to 100% of the load is 12V. Computer power supplies may have short circuit protection, overpower (overload) protection, overvoltage protection, undervoltage protection, overcurrent protection, and over temperature protection. All modern power supply form factors derive from the original ATX form factor, published by Intel in 1995.
Retrieved 2008-04-20. ^ "Fujitsu 12V only concept whitepaper" (PDF).