processor under 10k

My CPU Configuration: Processor:AMD Athlon X2 260@3.2 GHz Motherboard:Gigabyte 78LMT-S2P GPU:ATI Radeon HD 6670[Sapphire] RAM:4GB PSU:450W I recently decided to buy an FX-8120.But a local computer store owner said that 8120 is is a very high performance processor but my motherboard might not...