Dell OptiPlex E1 - Manual (Page 67)

PCI connector data width 32 bits (maximum)
System Clocks
Diskette/communications ports 48 MHz from system clock
System clock 66 MHz
Keyboard controller 48 MHz
Memory
Architecture 64-bit (non-ECC), noninterleaved
Wait states near 0
DIMM sockets 2 (gold contacts)
DIMM capacities 16-, 32-, 64-, and 128-MB SDRAM ("PC100" 100 MHz, 10 ns)
Minimum RAM 16 MB
Maximum RAM 256 MB
Memory access time synchronized with system clock
BIOS address F0000h
Drives
Externally accessible bays
Low-profile chassis (1) 5.25-inch bay for removable media device; (1) 3.5-inch bay for a
diskette drive
Mini tower chassis (3) 5.25-inch bay for removable media device; (1) 3.5-inch bay for a
diskette drive
Internally accessible bays
Low-profile chassis (1) 3.5-inch bay for a 1-inch-high hard-disk drive
Mini tower chassis (2) 3.5-inch bays for either one or two 1-inch-high hard-disk drives, or
one 1-inch-high hard-disk drive and one 1.6-inch-high hard-disk drive
Ports
Externally accessible:
Serial (DTE) (2) 9-pin connectors (16550-compatible)
Parallel 25-hole connector (bidirectional)
Video 15-hole connector
NIC RJ45 connector
PS/2-style keyboard 6-pin mini-DIN
PS/2-compatible mouse 6-pin mini-DIN
USB 2 USB-compliant connectors
Line-in (optional) miniature audio jack
Line-out
(amplified source) (optional) miniature audio jack