Need help finding CPU and motherboard (gaming)

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Jan 20, 2014
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Ok so as the title says i need help with the following of finding a good gaming Motherboard and cpu with it. I'm not sure if i need a new motherboard in order to get a new cpu? Or what but this is what i need help finding. I have 4 GB ram. My current motherboard and processor are
Motherboard: BQ480AAR-ABA p6527c Might have trouble finding it. I did.
Processor: AMD athlon II X4 635 2.9 ghz
Manufacturer: HP for the motherboard
Not sure about my power supply.. I saw something like 212 volts? But i went to go calculate my power supply output and it said around 330 so i'm not 100% sure.
Graphics card: Nvidia GeForce GTX 660 SUPERCLOCKED
My tower is a full tower i'm pretty sure. As it's big and bulky. (Yea i know, dat accuracy)
My budget is $350 to 400. Mostly $350 since that's all i have but if it's around 400 i can take a look. If you guys need any other information let me know but yea. I want to play games like ARMA 3, DayZ Standalone which i know those are pretty heavy CPU based. I might also play some games like skyrim and those heavy graphics games.