*Note* I own everything except the GPU at the moment
CPU: I7-3770K 4.2 GHZ
MoBo: MSI Z77A-G45
RAM: 8 GB Corsair Vengeance Blue 1600 MHZ
SSD: Samsung 840 120 GB
HDD: 1 TB Seagate Barracuda
CPU Cooler: Zalman LQ 310 Water Cooler
Case: Zalman Z11+
Sound Card: ASUS Xonar DX
GPU: Gigabyte GTX 770 WF3 OC 1189 MHZ(Plan to overclock slightly IF POSSIBLE)
PSU: CM Extreme 2 725 ( I know they're not that good... but all I could get)
Since you already own the psu, and it has been presumably working, go ahead and try it.
If it does not deliver sufficient power the most likely symptom will be artifacts from the gpu showing up on the monitor. Or, the need to lower the gpu clock.
So long as the psu does not fail under load, no harm will be done.