these days buying a power supply is pretty straightforward unless you're
going for a really specific aesthetic
get an ATX power supply which by the way are compatible with ATX microatx and
Mini ITX motherboards all you got to do is make sure it isn't some kind of
Bargain Basement no-name unit that will explode when you try and run crisis and
that it has enough wattage to power your rig and with high-end graphics cards
getting more and more power efficient these days and those are usually the
most power hungry part of a computer getting a PSU that's sufficiently
powerful is becoming less and less important by the day but it wasn't
always as easy as just slotting in the first thing you could find and carrying
on with your Computing in fact the power supply that came with the original IBM
PC only provided 64 watts of power
pushed a whopping 5 volts through the CPU which would fry any modern consumer
grade processor and forget about fancy
features like standby soft reset old school Power Supplies
only had a hard power switch so everything was either fully on or fully
off all the time with that said though
the really difficult thing about these older power supplies was their physical
layouts even in the era of at power
supplies the predecessor to ATX that lasted from 1984 until the late '90s
there were not only multiple different
form factors such as baby at XT and some
weird thing that worked with PS2 but some systems even had switches
slaughtered directly to the computer case out of the power supplies so good
luck replacing your PSU if it suddenly fizzled out further adding to the
frustration of technicians and tinkerers everywhere and then as if that weren't
enough there wasn't even one uniform standard for the actual pin outes onto
the motherboard amongst these different form factors I mean the power supply
scene was basically chaos but the ATX
standard saved us from an eternal Quagmire of proprietary form factors
when it was introduced in 1995 by Intel
especially as it actually did a lot more than just make our power supplies mostly
the same size in fact the ATX standard
made things much easier for home PC Builders as well as small shop owners
who wanted to build or offer something different than what the ibms of the
world were cranking out and not only did it make things easier having just one
standard made things cheaper improving competition throughout the industry and
generally speaking higher quality as well as a single standard forced
manufacturers to innovate and improve on quality rather than focusing their
efforts on trapping us into proprietary
Ville and that's exactly what happened assuming of course you're buying from a
reputable brand ATX power supplies have
evolved they've come in large and small varieties with both 80 and 120 mm fans
yet they're still ATX compliant and can fit in a wide variety of cases combine
that with improved efficiency in recent years as we've seen with the 80 plus
rating system and ATX has had fantastic
staying power in spite of several companies trying to replace it
throughout the years such as antech with their CPX design a few years back and
even Intel who tried to replace their own standard with the now defunct btx
form factor ATX also brought us familiar things that we now take for granted like
the 20 and then later 24 pin connector
which serves as the primary power delivery for pretty much all modern PCS
but the wires that connect to the motherboard to enable Smart power
management and a greater emphasis on
12vt power delivery you see older power
power supplies often delivered most of their power on the 5vt rail with many
actual sensitive components directly
connected to it these days the smaller
transistors on Parts like CPUs and
graphics cards play much more nicely with lower voltages I mean think about
overclocking your CPU putting two volts through it you might kill
it but on the flip side as computer
components have become faster and more powerful they actually need even more
current that's the amount of electricity being sent through the chip so modern
power supplies have more power on the 12vt rail and then it gets converted to
lower voltages for the many different components by voltage regulator modules
or vrms and those will be present on the motherboard or on the graphics card
itself this way the components can operate at a safe voltage and still get
enough current from the higher capacity 12volt rail ATX has also changed with
the times in other ways introducing PCI Express power connectors as graphics
cards went from sipping electricity to becoming the most power hungry component
in a PC a further Testament to its staying power when many other computer
standards have been put out to pasture within its lifetime but that doesn't
mean then that all modern power supplies use the exact ATX form factor there are
also derivative form factors such as sfx
which is essentially identical to ATX electrically and in fact interoperable
with ATX motherboards but a heck of a lot smaller making them popular for
things like super small mini ITX builds
in servers you'll find power supplies that have a couple of eps connectors so
EPS standard power supplies which actually is kind of funny because that 8
Pin CPU power connector ended up making its way into desktops as well and
finally there are things like tfx for slim Tower systems or I mean they still
do exist the dreaded proprietary power
supply fortunately for you though the PC
DIY Enthusiast most of those power supplies are nearly irrelevant unless of
course you find yourself working for a YouTube channel where you have to solder
connectors on weird power supplies you found in a scrap Heap somewhere in order
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