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these days buying a power supply is pretty straightforward unless you're

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going for a really specific aesthetic

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get an ATX power supply which by the way are compatible with ATX microatx and

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Mini ITX motherboards all you got to do is make sure it isn't some kind of

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Bargain Basement no-name unit that will explode when you try and run crisis and

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that it has enough wattage to power your rig and with high-end graphics cards

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getting more and more power efficient these days and those are usually the

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most power hungry part of a computer getting a PSU that's sufficiently

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powerful is becoming less and less important by the day but it wasn't

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always as easy as just slotting in the first thing you could find and carrying

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on with your Computing in fact the power supply that came with the original IBM

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PC only provided 64 watts of power

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pushed a whopping 5 volts through the CPU which would fry any modern consumer

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grade processor and forget about fancy

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features like standby soft reset old school Power Supplies

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only had a hard power switch so everything was either fully on or fully

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off all the time with that said though

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the really difficult thing about these older power supplies was their physical

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layouts even in the era of at power

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supplies the predecessor to ATX that lasted from 1984 until the late '90s

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there were not only multiple different

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form factors such as baby at XT and some

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weird thing that worked with PS2 but some systems even had switches

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slaughtered directly to the computer case out of the power supplies so good

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luck replacing your PSU if it suddenly fizzled out further adding to the

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frustration of technicians and tinkerers everywhere and then as if that weren't

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enough there wasn't even one uniform standard for the actual pin outes onto

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the motherboard amongst these different form factors I mean the power supply

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scene was basically chaos but the ATX

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standard saved us from an eternal Quagmire of proprietary form factors

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when it was introduced in 1995 by Intel

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especially as it actually did a lot more than just make our power supplies mostly

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the same size in fact the ATX standard

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made things much easier for home PC Builders as well as small shop owners

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who wanted to build or offer something different than what the ibms of the

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world were cranking out and not only did it make things easier having just one

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standard made things cheaper improving competition throughout the industry and

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generally speaking higher quality as well as a single standard forced

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manufacturers to innovate and improve on quality rather than focusing their

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efforts on trapping us into proprietary

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Ville and that's exactly what happened assuming of course you're buying from a

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reputable brand ATX power supplies have

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evolved they've come in large and small varieties with both 80 and 120 mm fans

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yet they're still ATX compliant and can fit in a wide variety of cases combine

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that with improved efficiency in recent years as we've seen with the 80 plus

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rating system and ATX has had fantastic

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staying power in spite of several companies trying to replace it

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throughout the years such as antech with their CPX design a few years back and

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even Intel who tried to replace their own standard with the now defunct btx

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form factor ATX also brought us familiar things that we now take for granted like

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the 20 and then later 24 pin connector

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which serves as the primary power delivery for pretty much all modern PCS

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but the wires that connect to the motherboard to enable Smart power

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management and a greater emphasis on

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12vt power delivery you see older power

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power supplies often delivered most of their power on the 5vt rail with many

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actual sensitive components directly

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connected to it these days the smaller

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transistors on Parts like CPUs and

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graphics cards play much more nicely with lower voltages I mean think about

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overclocking your CPU putting two volts through it you might kill

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it but on the flip side as computer

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components have become faster and more powerful they actually need even more

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current that's the amount of electricity being sent through the chip so modern

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power supplies have more power on the 12vt rail and then it gets converted to

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lower voltages for the many different components by voltage regulator modules

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or vrms and those will be present on the motherboard or on the graphics card

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itself this way the components can operate at a safe voltage and still get

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enough current from the higher capacity 12volt rail ATX has also changed with

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the times in other ways introducing PCI Express power connectors as graphics

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cards went from sipping electricity to becoming the most power hungry component

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in a PC a further Testament to its staying power when many other computer

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standards have been put out to pasture within its lifetime but that doesn't

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mean then that all modern power supplies use the exact ATX form factor there are

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also derivative form factors such as sfx

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which is essentially identical to ATX electrically and in fact interoperable

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with ATX motherboards but a heck of a lot smaller making them popular for

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things like super small mini ITX builds

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in servers you'll find power supplies that have a couple of eps connectors so

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EPS standard power supplies which actually is kind of funny because that 8

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Pin CPU power connector ended up making its way into desktops as well and

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finally there are things like tfx for slim Tower systems or I mean they still

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do exist the dreaded proprietary power

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supply fortunately for you though the PC

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DIY Enthusiast most of those power supplies are nearly irrelevant unless of

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course you find yourself working for a YouTube channel where you have to solder

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connectors on weird power supplies you found in a scrap Heap somewhere in order

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to get a computer to boot at the last moment in a competition say for example

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video description so thanks for watching guys if you liked this video like it if

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