Hello, I only got to ask if your main goal is gaming or if you want video rendering or a little of both. I would try to get a new graphics card because AM3+ is cheap to upgrade. A FX-4130 or a 4150 are great cheap options which are quad cores, they only will run you about 45-60 bucks on ebay and some on amazon. But I would save up to get a better graphics card. If you are looking for cheap options than look on ebay and amazon for R9-280x. I picked up a diamond R9 280x for 180 dollars on ebay and It works just fine. If you have anymore questions please message me back.
PS: A R9 280x is overkill for 720p