OCZ Fatal1ty 550w enough to run...

Yes, it will be plenty, it appears to have up to 38A(456W) available from the 12V rail which is plenty for any single GPU system no matter how power hungry the processor. You have plenty of power left over.

Yes the PSU is enough for your config and it can give even more power when you need.

Yes, the power supply can easily power your system.

The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the 12 volt rail(s) can easily power an overclocked system with any single video card made.

Excellent. Thanks, all, for your assurance.