this isn't really a question but will the power supply fail, overheat... ?
The PSU could do any number of things if it is overloaded.
What happens depends very much on the details and the PSU quality.
Is it a transient spike or a constant load, what rails/voltages are overloaded or are multiple overloaded etc.
A good PSU will ride out a transient spike, and shut down if the load lingers, a bad PSU could catch fire or parts explode which would also quite likely destroy other PC components.
As NightHawkRMX says, what Graphics card draws that much power.? Or are you reading what the graphics card manufacturer recommends as the minimum power supply wattage for that Graphics card.?