Components shown in the one-processor system are shown from the upper left-hand corner clockwise as follows: retaining lever for the CD/DVD driver, retaining lever for optional 5.25 inch devices, hard drive cage, extender card, PCI-X 100 MHz slot, PCI-X 100 MHz slot, AGP 8x slot, PCI-X 100 MHz slot, PCI-X 133 MHz slot, PCI-X 100 MHz slot, system fan, and the power supply. In the center of the figure, the memory banks (slots 1-4) and CPU 0 are shown.