Less likely, I'd still reinstall drivers just because I like to explore the cheapest fix first.
If you are hesitant on dropping cash on a psu and you have more than 1 ram stick, check the ram (remove 1 stick and repeat) or run a memory checking program.
I really am leaning towards the psu thing but I want you to cover your bases instead of dropping 100 bucks on a decent psu
Also I'm not familiar with your psu. How many amps are on the 12volt rail?
Often times that is the number you want to look at more than the peak wattage.
I had a 730 watt power supply that was pretty cheap and the amperage on the 12 volt rail was too low for my 1090t.http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021
Im a big fan of corsair psu's. If you can get this or the gs700(which my local best buy has) that would be great. Corsair has fantastic customer service if something were to happen.
The main thing I would look for is at least 600 watts and 40amps on 12v rail.