Looked at that card, dual fan ASUS brand NVIDIA card GTX Geforce 750Ti not super clocked. Not an electrician to really give you good explanation about watts, amps, voltage.
Good analogy from a forum, So, if you look at a power supply label and it shows that the +12V line supplies 18A of power, that voltage rail can supply a maximum of 216W of power. This may be only a small fraction of say the 450W the power supply is rated at.Now this card says about 150w draw. PSU you have has (2) 12v rails which is good in ways.
Here is answer in ways of consequences,
What are the potential risks of using an improper power configuration for my graphics card?
It depends on the design of your PSU and your GPU. In the ideal case, your GPU or PSU (or both) would simply refuse to work, or power itself off, when it over-draws on the current, thus protecting the motherboards from damage. Attempting to over-draw can cause heat buildup, and in the worst case, fire, because amperage ratings are based on what the wires are rated to handle, based on their resistance (which is another way of saying "heat"). More current, more heat. So you need a lower resistance wire or a good heat dissipation strategy to carry a larger amount of current.
If understand that in ways of taking more from a PSU then it can supply. Fact is you maybe o.k. with this PSU, many who do upgrade sometimes change that part to, when computer companies sell built PC usually do not provide best parts when comes to power supply, assume to save on costs. Matters how much other hardware besides video card you have hooked up. Any other cards in slots besides 1 card you have now ?
Edited by jds63, 22 September 2015 - 01:47 PM.