Talk:Power supply unit (computer)

Label

Example ATX power supply label

AC Input	100–240 Vac — 10–5A 50–60Hz
DC Output	+3.3V	+5V	+12V1	+12V2	+12V3	+12V4	−12V	+5Vsb
Max Output Current	36A (118.8 W)	30A (150 W)	18A (216 W)	18A (216 W)	18A (216 W)	18A (216 W)	0.5A (6 W)	3.0A (15 W)
Max Combined Power	155W		680W				20W
Total Power	700W

Does 3.3v serve any purpose?

Point of interest, I believe the 3.3v rail was introduced with the first 'Slot A' ATX processors as the core voltage. Processors then started using bespoke core voltages, thus the 3.3v rail lost its original purpose. As the article says, it is easier to regulate the 5v or 12v rail to provide a selectable core voltage, which is what most if not all mobo manufacturers do. It's also on SATA power plugs, but again it's questionable as to whether it's used by any modern disk. It would be interesting to know if the 3.3v rail is doing anything at all in the modern PC, or if it's just a piece of historical baggage. Anyone got the lowdown on that? --Anteaus (talk) 17:02, 18 January 2016 (UTC)

Hello! For example, PCI Express slots provide 3.3 V power supply lines, see this document for more details. Pretty much the same applies to conventional PCI slots. — Dsimic (talk | contribs) 22:14, 18 January 2016 (UTC)

Suggest adding paragraph for Top Mount vs Bottom Mount design

I looked up this article hoping to find more information on when PSUs changed from being Top Mounted in the computer case to Bottom Mounted, along with some info on the efficiency of the Bottom Mount design. I think this would be a good addition to this article and help explain why PSUs are mounted in cases the way they are. Dlsimon (talk) 14:48, 5 May 2016 (UTC)

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A possible typo

shoutcut ->shortcut or shortout ? rato -> ratio ?