HP ML530 ProLiant ML530 Generation 2 Server Setup and Installation Guide - Page 127

PCI-X Technology Expansion Slot Speed LEDs The bus architecture delivers matched speed of expansion boards on the same bus. IMPORTANT: Always pair expansion boards of the same speed on the same bus for optimal performance. If expansion boards of different speeds are installed on the same bus, the server sets the bus speed to that of the slower expansion board. Use Figure 4-2 and Table 4-3 to identify the speed for each PCI slot and to help ensure optimal performance. Figure 4-2: Expansion slot speed LEDs Table 4-3: Expansion Slot Speed LEDs LED 1 2 3 4 Slot Speed 33 MHz PCI 66 MHz PCI 66 MHz PCI-X 100 MHz PCI-X 4-6 HP ProLiant ML530 Generation 2 Server Setup and Installation Guide