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-5v = 3.6v???

T

torvalds

Limp Gawd
Joined
Jan 28, 2004
Messages
211
I just got a new Antec NeoPower 480w psu and I put it in my pc. When I booted up I started hardware doctor to check voltages etc.. then a beeping noise started and it flashed up a warning saying that my -5v was too low. The voltage for the -5v was 3.60v. The +5 is ok, it is 5v on the dot. Can anybody tell me what this mea
 
Chances are that this PSU doesn't even have a -5V rail, as this voltage hasn't been used since the ISA bus.
 
All kinds of weird things happen when switching power supplies aren't run on a load, like your -5 volt rail is doing. It's no surprise that its reading is all over the place. Then again, Hardware Doctor is not a reliable place to find out power supply voltages in the first place.
 
the Neopower conforms to the ATX12V v2.0 spec

and there is no -5V rail (or more accurately the Neopower doesnt have it as its been dropped from the spec, doesnt mean other ATX12V v2.0 makes couldnt include it, its just not in the guidelines anymore) look at your main power connector, the missingf wire is where the -5V would have been

as mentioned, when not underload rails act funny, your supply does still have a -12V rail
but its safe to ignore it as well ;)

Standard Output Voltages (ATX\ATX12V v1.3)

-12 V: This voltage is used on some types of serial port circuits, whose amplifier circuits require both -12V and +12V. It is not needed on some newer systems, and even on older ones not very much is used, because the serial ports require little power. Most power supplies provide it for compatibility with older hardware, but usually with a current limit of less than 1 A.
-5 V: A now archaic voltage, -5 V was used on some of the earliest PCs for floppy controllers and other circuits used by ISA bus cards. It is usually provided, in small quantity (generally less than 1A), for compatibility with older hardware. Some form factor power supplies such as the SFX no longer bother to supply it (systems using the SFX power supply are intended not to have ISA bus slots).
Click to expand...
 
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