Bottleneck (help)

Hi all.

I recently bought AMD R7 250 2 Gb Graphic card,And I thought I would solve the problem with FPS in CS GO,And in other games.

 

PC specifications:

 

CPU: Amd Athlon 64 x2 4400+ 2.30 ghz

GPU: AMD R7 250 2 Gb GDDR5

RAM : 4 GB

 

When I bought a GPU mine fps in CS:GO is (15-20),My CPU is unable to deliver enough performance to match my GPU.

So can you advise me about buying new CPU? My Socket is AM2, Do I buy a new motherboard with AM3+ Socket,and which one, or to buy CPU Only.

I do not need a strong PC,Just to meet my needs,and those are ...That i can play CS:GO in 60+ fps and recording without lag.

 

 

Thanks.