System Features
Processors
The VL420 is equipped with a socket 478B Intel Pentium 4 processor. The
478B PGA
Socket
processor is connected to the system board through a Pin Grid Array (PGA)
478B Socket.
A heatsink and fan (not shown) cover the processor to prevent it from
overheating. If the heatsink is removed, the thermal interface material between
the heatsink and the processor must be replaced by a new one. If no thermal
interface is used or the old one is re-used, then cooling may be impaired and
the processor damaged.
To find out more about Pentium 4 technology, refer to the
Technical Reference Manual - HP Business
PC Technology
.
System Board Switches
The following table gives the functionality and default position of switches on
the system board switch block:
System Board
switches
Switch
Default Position
Function
1-4
OFF
Reserved
5
OFF
ON = Clear CMOS
6
OFF
ON = Clear Password
7
OFF
ON = BIOS crisis mode recovery
8
FF
Not
used
9
ON
OFF = Boot block FLASH protect
10
OFF
Not used
O
Accessory Board Slots
The VL420 has four accessory board slots: three PCI slots and one 1.5V AGP
slot.
PCI 2
AGP
PCI 3
PCI 1
The PCI slots are PCI 2.2 compliant and each slot supports a maximum total
current of 375 mA. The VL420 small form factor PCI slot blank panels are half
size.
Your graphics card is installed in the AGP slot. The 1.5V AGP slot is backward
compatible with AGP 1x, 2x and 4x modes. A latch on one end of the AGP slot
locks the graphics card in place.
product description 21