r9 270x toxic with this psu ?

[Merilahti]

Hello guys , i just have a quick question.

 

I've recently bought the R9 270x TOXIC by Sapphire and i just wanted to know if it's gonna be ok with my old psu which is a : Cooler master real power M520.

 

I know that i need a 500w psu for that card and i have it ,  my doubts are on the 12v rails (it has 3 rails) which are not that powerful in this psu (19A for each)

 

Here is what i currently have in my pc

 

intel 2500k with the hyper plus 512 fan

2fans (from my antec p182)

Samsung 840 120go sdd

1to hard drive

dual screen (one vga , one hdmi)

 

Thanks in advance for your answers.