Motherboard Features
10
Microprocessor
The motherboard supports a single Pentium II processor operating at any of the Pentium II
processor speeds, voltages, and bus frequencies. Processors are not included with the SE440BX
motherboard and must be purchased separately.
The processor is packaged in a Single Edge Contact (S.E.C.) cartridge. The cartridge includes the
processor core, second-level cache subsystem, thermal plate, and back cover.
The processor connects to the motherboard through the Slot 1 connector, a 242-pin edge connector.
When mounted in Slot 1, the processor is secured by a retention mechanism attached to the
motherboard. A passive heatsink is stabilized by the heatsink support.
Microprocessor Upgrades
The motherboard can be upgraded with Pentium II processors that run at higher speeds. To
upgrade the processor, use the BIOS configuration mode to change the processor speed, see
Chapter 2.
Main Memory
The motherboard has three sockets for installing dual inline memory modules (DIMMs).
Minimum memory size is 8 MB; maximum memory size is 384 MB. To install memory, see
Chapter 2.
Second Level Cache Memory
The second-level cache is located in the S.E.C. cartridge. The cache includes synchronous
pipelined burst static RAM (PBSRAM) and tag RAM. There are four PBSRAM components
totaling 512 KB in size. All supported onboard memory is cacheable.
PCI Enhanced IDE Interface
The PCI enhanced IDE interface handles the exchange of information between the processor and
peripheral devices like hard disks and add-in boards inside the computer. The interface supports:
• Up to four IDE devices such as hard drives
• ATAPI devices
• PIO mode 3 and PIO mode 4 devices
• Up to four PCI cards or up to two ISA cards and three PCI cards
• Logical block addressing (LBA) of hard drives larger than 528 MB and extended cylinder head
sector (ECHS) translation modes
• Support for laser servo (LS-120) drives