Dell OptiPlex E1 Service Manual page 15

The OptiPlex E1 computer has three expansion-card slots. The riser board has
two ISA expansion-card connectors and two PCI expansion-card connectors.
One PCI expansion-card connector and one ISA expansion-card connector
share a single expansion-card slot, resulting in a total of three expansion-card
slots (see Figure 1-4). The computer has a passive riser board, with no PCI-to-
PCI bridge. The riser board includes the P1 connector (for connecting the NIC
to the riser board cable) and an LED (see Figure 1-4). If the LED is on, the riser
board is receiving power; if off, the riser board is not receiving power.
LED
ISA2 connector
HDLED
)LJXUH  5LVHU %RDUG
The system board has various accommodations for system upgrades
including:
Main memory expansion
Video memory expansion
These upgrades are summarized in the following subsections, and installation
procedures are provided in Chapter 4.
The two DIMM sockets on the system board can accommodate combinations
of 16-, 32-, 64-, and 128-MB, 64-bit nonparity DIMMs, up to a total memory
capacity of 256 MB.
You can upgrade video memory from 2 to 4 MB by installing an optional video-
memory upgrade module in the video-memory upgrade socket on the system
board. Adding video memory increases the system's video performance and
provides additional modes for high-resolution/expanded color applications.
NOTE: See the online System User's Guide or Chapter 6, "Installing System
Board Options," in the Reference and Installation Guide for additional upgrade
information.
P1 connector
ISA1
connector
PCI2
connector
PCI1
connector
System Overview 1-7