Haven't upgraded yet still have a 900mghz model, but 500meg of ram and a twin 40hdd. Its holding its own. The old commodore had 8k of ram 14k of rom and sped the computations through at a blistering 550 hertz. I had an osborne suitcase computer for a while with the amazing twin 5.25 in floppies and a Apple Lotus computer...But every new system has its quicks. I used the grease on my Pentium 90's and those CPU's are still in my nostalgia drawer. I got ya on the greatest number though I had 11 at one time including a server.