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Red switch on back of Power Supply Unit help?

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May 16, 2013 3:43:02 AM

Hello everyone, my PSU has a red switch on the back for changing voltages depending on which country i'm in I'm guessing, however, i'm confused at the fact that the 2 options are labeled "1.3 Ver." and "2.01 Ver.".

The PSU in question is a Zumax, 850 watt and I am in the United States, any help figuring this out would be great, considering I couldn't find anything about this in the manual that came with the PSU or on the website.

Thanks in advance.


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a b ) Power supply
May 16, 2013 3:51:30 AM

It seems like it's referring to ATX specifications version 1.3 and 2.01. From version 2.0 on, PSUs deliver most of their power on the 12V rail instead of the 3.3V and 5V rails that were important in earlier systems.

So I guess the PSUs somehow reconfigures itself to work better with older and newer systems. You'd definitely want to run it in 2.01 mode with any non-ancient hardware.

Edit: Looks like it just switches between having a single 12V rail (1.3) or splitting it in two rails (2.01). It may not make much of a difference in practice, but I'd still recommend 2.01 mode.
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May 16, 2013 4:17:50 AM

Sakkura said:
It seems like it's referring to ATX specifications version 1.3 and 2.01. From version 2.0 on, PSUs deliver most of their power on the 12V rail instead of the 3.3V and 5V rails that were important in earlier systems.

So I guess the PSUs somehow reconfigures itself to work better with older and newer systems. You'd definitely want to run it in 2.01 mode with any non-ancient hardware.

Edit: Looks like it just switches between having a single 12V rail (1.3) or splitting it in two rails (2.01). It may not make much of a difference in practice, but I'd still recommend 2.01 mode.


Alright, thanks allot Sakkura! You totally answered my question and reassured me about the ATX versions. I guess it's not really for changing the voltage depending on what country your in, but more of what type of motherboard your plugging it into? But anyways, at least I know my PSU wont explode :)  thanks allot for the help.

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