<p>The specified PC uses PC100 SDRAM and supports up to 512mb. It has two slots, and comes with 64mb, so you must have a 64mb and 128mb chip. You would have to replace both chips with 256mb chips. I would recommend a new pc, as a far more powerful system can be had for under $600 (it would end up costing over $100 to replace both chips, and the performance of a $600 pc would be far more than sixfold to your current, and not nearly enough to run modern games).</p>