I have Theses Specs
Intel I7 4770
Gtx 650
And i will upgrade to the Gigabyte R9 280x it seems a bit better than the Gtx 770 so What psu will have enough power and all the connectors required?
Your proposed setup will draw max 300w
If that's all that's in your system, you'll be able to get away with a pretty small PSU. Cooler master's wattage calculator said you'd only need 299 watts, but feel free to look it up yourself here: http://www.coolermaster.outervision.com/PSUEngine
the 280x is cheaper and about 10% more powerful... i'd recomend getting an 800w now, so if a year from now you want to add a second 280x, you dont need to change PSU.
Your proposed setup will draw max 300w
If that's all that's in your system, you'll be able to get away with a pretty small PSU. Cooler master's wattage calculator said you'd only need 299 watts, but feel free to look it up yourself here: http://www.coolermaster.outervision.com/PSUEngine