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Quick Question on Amps on a 12v rail

Hello, im planning on building a new pc (about 714$)

But, one question, The Graphics card (Gt 640 2gb GDDR5 GPU

http://www.memoryexpress.com/Products/MX39799)

Needs 20A on the 12v rail, but, the choosen powersupply only gives 18A

(http://www.memoryexpress.com/Products/MX34935)

Is this a concern? Would the PSU burn out, or fail? or just use more power?

Here's the build.

(CPU: http://www.memoryexpress.com/Products/MX45433

MOBO: http://www.memoryexpress.com/Products/MX45860

HDD: http://www.memoryexpress.com/Products/MX32264

RAM: (I Have 4gb DDR3 sticks (2x2gb)

Case: http://www.memoryexpress.com/Products/MX47403

Optical Drive: http://www.memoryexpress.com/Products/MX45542

GPU: http://www.memoryexpress.com/Products/MX39799

Fan 120mm http://www.memoryexpress.com/Products/MX38317)
3 answers Last reply Best Answer
More about quick question amps 12v rail
  1. 18A +18A < 18 on each rail your fine!

    It has 2 rails.
  2. Best answer
    It is combined they mean and both rails have 360watts between them, so combined it is 360watts/ 12 volts = 30amps! You are good to go.
  3. rolli59 said:
    It is combined they mean and both rails have 360watts between them, so combined it is 360watts/ 12 volts = 30amps! You are good to go.


    *Face slap* Riiiight... forgot math, Thanks guys!
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