I have a dell optiplex gx 280 and a gt610. I have 4Gb ram 533 MHz. My pentium 4 is 3.00 GHz with hyper threading. I would like to know what 64 bit pentium 4 I could put in this gx 280. And if 800 MHz ram is compatible. Would this help in performance? If it would help please tell me how much fps I will likely gain in minecraft.