HP Model 748 Installing the A4505A PCI Module Upgrade - Page 5

Procedure Slot 1 Slot 2 Figure 1 NOTICES: Screws Slot 4 Slot 3 Removing the EISA Module 5 Note that the slots are numbered on the front of the tray from 1 to 4. This PCI tray only supports option cards with +5 volt bus signalling. If your workstation application requires several accessory cards and mass storage devices, power budgeting may be required. This ensures the power needed for these internal devices does not exceed the power available in the system. The PCI tray provides power for option cards from both a +3.3 Vdc source and a +5 Vdc source. Cards may use either or both power sources, up to 25W per slot. However, the +3.3 V dc source is limited to 39.8 W combined for slots 1 and 2, and 39.8 W combined for slots 3 and 4. For example, if the card in slot 1 draws 25 W at +3.3 V dc, only 14.8 W at +3.3 V dc is available to a card in slot 2. The limits of + 5 Vdc is 25 W per slot. If you upgrade your system, adding more: RAM cards, mass storage devices, or VME, or PCI accessory cards, you must recompute the power budget to ensure the new configuration is within the system's capability. Refer to your system's documentation for other power limits. 5