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Power Supply question / low voltage rails

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
3 answers Last reply Best Answer
More about power supply question low voltage rails
  1. Low amps on 12v rail is not good get corsair otherwise you'll have this http://www.theregister.co.uk/2012/11/26/exploding_computer_vs_reg_reader/
    12v rail usually runs graphics card and CPU (not sure about CPU)
  2. Best answer
    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
  3. 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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