Will this PSU bear up with an R9 270x?

Solution
The R9-270 does not "require" 500W. That is just the GPU manufacturer's blind recommendation for the whole system they know nothing about based on what sort of system they expect a given GPU model to land in, along with a generous margin in case of crappy PSU.
The R9-270 does not "require" 500W. That is just the GPU manufacturer's blind recommendation for the whole system they know nothing about based on what sort of system they expect a given GPU model to land in, along with a generous margin in case of crappy PSU.
 
Solution