dell dosent use propeitary mem, my old dimension 4100 had 64mb and i bought two 256 sticks of kingston and it works great, it has been regulated to "family" computer now, you cant play HL2 on a 900mhz pIII after all. if you need a goo dprice you can buy systemax pc from tiger direct with linspire pre-intalled, they are sempron based systems so they should get the job done.