corsair VS450 : power supply rails used by components.

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satish satz

satish satz

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Oct 3, 2013
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What are the uses of rails like +5v, 3.3v ??
On which rail does each component gets its power?
1) CPU, 2) GPU 3) motherboard 4)case fans 5) HDD etc!

I need to know this because, I plan on buying some 120mm case fans! My PSU has a single rail +12v that provides 34amps!

My config is,
AMD FX 8320 (125w tdp)
Gigabyte 78lmt usb3 motherboard
About to get the sapphire HD 7770 GPU or may be gtx 650ti if the PSU is fine.
corsair vengeance 8gb, (4gbx2)

Corsair VS450 450w PSU with 34amps on single +12v rail.

So Is there enough room with my 408w (34 amps x 12volts = 408w) on my power rail for all the above specs? Plus like I said, I want to add 4 case fans and I don't want the 12v rail to be running very closely to max!
Thanks!
 
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dannylivesforher

dannylivesforher

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Sep 21, 2012
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The digital electronic components and circuits in the system (motherboard, adapter cards, and disk drive logic boards) typically use the +3.3 V or +5 V power, and more power hungry parts like CPU and GPU,the motors (disk drive motors and any fans) etc use the +12 V power. In addition, voltage regulators on the motherboard or in other components convert these standard voltages to others as necessary.
The positive voltages seemingly power everything in the system (logic and motors), and the negative voltages are used not much.In fact, –5 V was removed from the ATX12V 1.3 and later specifications. The only reason it remained in most power supply designs for many years is that –5 V was required on the ISA bus for full backward compatibility. Because modern PCs no longer include ISA slots, the –5 V signal was deemed as no longer necessary. However, if you are installing a new power supply in a system with an older motherboard that incorporates ISA bus slots, you want a supply that does include the –5 V signal.
The main function of the +12 V power is to run disk drive motors as well as the higher-output processor voltage regulators in some of the newer boards. Usually, a large amount of +12 V current is available from the power supply, especially in those designed for systems with a large number of drive bays (such as in a tower configuration). Besides disk drive motors and newer CPU voltage regulators, the +12 V supply is used by any cooling fans in the system—which, of course, should always be running. A single cooling fan can draw between 100 mA and 250 mA (0.1–0.25 amps); however, most newer fans use the lower 100 mA figure. Note that although most fans in desktop systems run on +12 V, portable systems can use fans that run on +5 V or even +3.3 V.
 
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