Amy's Computer Componets

Are they worth upgraded PC?
~ ~ PC Specifications Motherboard: EVGA NVIDIA nForce 750i SLI FTW ATX ~ ~ currently Processor Features: Intel Core 2 Quad Q6600 Kentsfield@3.2-GHz Graphics Card: EVGA GeForce GTX 260 Core 216, memory (RAM): 4GB G. SKILL (2 of 2 GB) X-Power: Corsair TX750W Tower Case: Antec Nine Hundred ATX mid-tower [...]