600 Mhz is it. This is not a gaming platform. There is no AGP slot, so you will have to get by with PCI. The IDE bus speed is 33 Mhz. not ATA-100 or 133 as on newer machines. The max ram is 768, but not just any SDRAM that you might buy today will work. Get the picture? It is a business machine. They are very stable, but the kind of games you want will not work. For what you would spend attempting to upgrade, you could make a downpayment on a gaming platform, or buy an XBox.