Yes. A CM 460 produces a total of 26 amps at 12 volts. Ignore the "2 rails at 18 amps max" on the PSU label. Look at the total power: 312 watts - or 26 amps.
The CPU and GPU each need about 8 - 9 amps.
More troubling is that CM PSU's are excessively mediocre PSU's. A higher quality PSU would be better.