depends on what you are doing, I have found (by switching parts around that I have) that loading large programs (games, photoshop, various video editors) a significant increase in speed. Granted you need a fast hd too but even with my 80 gig maxtor plus and my sis 512 of ddr333 is considerably slower then with my 512 ddr400. Thats why im hell bent on having it if possible.