Components shown in the two-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, mezzanine card memory banks (slots 5 -8), system fan, mezzanine card with CPU 1, and the power supply. In the center of the figure, the memory banks (slots 1-4) and CPU 0 are shown.