Greetings, let me explain u how it works..u need a graphic card at least a Gtx 660ti for ultra setting bf3 at minimum 60 fps..or a 7950boost for AMD, minimum 60 fps(so i guess even grater than that fr bf4)
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...this is what matters..secondary but still important is the Cpu.
Cpu is secondary cz GPU handle the graphics. Still though, GPU sents the processes to CPU so if u dont have a good Cpu u might bottleneck ur vga card. You must have a good single-threated performance to easily play games. AMD is good for multi-threated performance (for example.multi means u are watching a movie and u are listening to music and encoding a video.) (single.is playing a game)
i have a Q6600 2.4Ghz and i wanted to buy a gtx 760 but i was held back for bottlenecking. I learned that from 60 fps where normal gaming is at ultra with gtx760 with a good CPU, my Q6600 with reduce it to 50 fps.I overclocked at 3.5 ghz and gained 5 fps or so (depends on the game.) here is a comparison to my Q6600 with your processor (A8 3850)
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and here is a comparison between your processor and a new processor that can hadle easily a gtx 760 and more.
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*the graphs show that there equal but we are interested in single treated.(A8 is good at graphics, but it wont matter cz u will have a dedicated gpu.)
*PS pla do correct me if i am wrong.
**My oppinion...buy 1) Asus mobo about 250$ 2) Gigabyte 760 or 770 gtx 250$ or 300$ 3)i5 3570k 250$ 4)tagan PSU 500W 250$ here u are now are a gamer