you can run the 670 fine with 300w PSU but two things you have to care about that,
1: make sure the psu is good rated and a quailty brand like antec,XFX,corsair.
2: you do not have to overclock anything.
At max load GTX 670 eats about 162w.
well the 290 has more raw horsepower but does use more power but theres mantle which no one really knows if it will improve or not and then with 770 u have less power not as powerfull still decent and u can record with it without buying a capture card or using fraps and u get support for...
It's hard to find a good gaming pc for this low amount of money I have had the same problem but recently found on amazon gaming rigs by vibox which are inexpensive and have pretty impressive specs
Hopes this helps
Having used sli, crossfire, and a multitude of cards throughout my career I will always suggest a single powerful gpu. Go GTX 680 and don't look back my friend. AMD drivers will give nothing but headaches.
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