Please tell us why you are asking this question. It is such a broad question that I am really wondering if you are planning on upgrading, or if you are juggling a few things around and are trying to pick which one will give you the most bang for your buck. If you have less than 512mb of memory, then definately upgrade your memory. If you have 512mb of memory or more, but have less than a 9600 Pro video card, then upgrading your video card will give you a major boost in games. If you have less than an Athlon XP 2000 or equivelant, then and 512mb of memory and a 9600 Pro or better then upgrade your cpu to the best that you can, and if need be upgrade the mobo too. Of coarse with the memory and cpu there are altering factors, like overclockability etc. Like my old XP1700 would run at 2100-2300mhz all day long depending on the outside temps. SO yes, getting your bandwidth up on your memory, (fsb) will definately bring an on the virge computer up out of the dumps and help it run games reasonably. I myself have been using this method of OC'ing for years to keep my rigs cost effective gamers. Dating back to the Celeron Flip CHip days, going from 66fsb to 100 was a huge boost to those lousy chips and made them reasonable gamers in thier day.