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Power Supply question / low voltage rails

Last response: in Components
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March 18, 2014 6:49:30 AM

This question is about AMPs , not watts :) 
im trying to upgrade video cards to a gtx 750ti which requires 20A on the +12v rail.
Currently i have a no-name psu with Output +3.3V@28A, +5V@30A, +12V@15A, -12V@0.8A, +5VSB@2.0A
so im thinking of upgrading to a corsair with Output +3.3V@25A, +5V@20A, +12V@38A, -12V@0.8A, +5VSB@3.0A

(motherboard Asus m4a785t-m)
my question is this , what runs on the low voltage rails, because thats where i will have access to less power(or amperage). I really have no idea what draws from them, or if the lower amperage is still enough.
Thanks

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March 18, 2014 7:02:22 AM

Hi

A good quality brand with the ratings of the Corsair PSU should be more than enough for a single graphics card
even though slightly less Amps than the original PSU at 5V & 3.3V

Uses
12 V for Graphics Cards, CPU, 3.5" hard disk and optical drive

5V & 3.3 V supplies for other devices on motherboard (RAM)
5V for 2.5" hard disks & USB devices

regards
Mike Barnes
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March 18, 2014 8:53:35 AM

mbarnes86 said:
Hi

A good quality brand with the ratings of the Corsair PSU should be more than enough for a single graphics card
even though slightly less Amps than the original PSU at 5V & 3.3V

Uses
12 V for Graphics Cards, CPU, 3.5" hard disk and optical drive

5V & 3.3 V supplies for other devices on motherboard (RAM)
5V for 2.5" hard disks & USB devices

regards
Mike Barnes


ok just wanted to get some idea of what the low voltage rails were used for , i had read some things that stated similar uses. thanks very much for your help
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