|Here's a couple of comments from Tom's Hardware:|
"Enthusiasts looking to crank up the detail settings in today’s hottest titles need to think bigger than the 380/380X"
But...."Gamers willing to tone down graphics quality at 1080p for the sake of spending less should consider the Radeon R9 380. Available under $200, it’s a full $100 less than the 390. And if you pay close enough attention, it’s possible to find 4GB models selling for the same price as the cheapest 2GB versions."
And I suggest you double check the specs of the PSU. Does it have multiple +12v rails or a single +12v rail? A single high amperage +12v rail is preferred.