Okay, so last time I posted here for GPU upgrade. I upgraded my PSU (160W --> 300W) and GPU (GeForce 9300GE --> Radeon HD 5570). Gaming performance is vastly improved. Now I debating whether or not to upgrade my CPU. My PC is HP Slimline s3600z My current CPU -- > Athlon 64 X2 4450e (AMD K8, 2.3GHz, 1MB L2, TDP 45W) Possible upgrade option, * Athlon 64 X2 5050e (AMD K8, 2.6GHz, 1MB L2, TDP 45W) * Phenom X4 9450e (AMD K10, 2.1GHz, 2MB L2, 2MB L3, TDP 65W) Before you say anything, my PC is a prebuilt one. BIOS wouldn't let me overclock. I also plan on keeping this PC for a long time. I do plan on building a new PC in a year or so, but I will keep my existing PC along with my new one. I'm also worry about going into 95W CPU, afraid my motherboard can't handle it. So should I upgrade? If so which one? Higher clock speed or newer architecture?