Technical Information 1-13
Processor Upgrades
The DK440LX system board uses a dual retention mechanism (RM) for securing the
Pentium II processor(s) in the Slot 1 connector(s). The same dual retention mechanism is
used for either a single and dual processor configuration.
CAUTION:
In a single processor configuration,
the processor must be installed in the boot
processor Slot 1 connector (the slot closest to
the back panel) and a termination card must be
installed in the application processor slot. If the
processor is installed in the second Slot 1
connector (the application processor slot), the
computer will not boot.
If you are installing two processors, the following values must be identical for both
processors:
second-level cache size and type (ECC or non-ECC)
operating voltages
maximum bus and core frequencies.
Both processors must be of the same stepping or 1 step different (such as C0 to C1).
These values can be determined by checking the parameters of the “s-spec” number. The
“s-spec” number is a five-character code (for example, SL28R) printed on the top edge of
the SEC.
CAUTION:
If the operating voltages do not
match, the computer will not boot.
When upgrading the processor, use the BIOS Setup utility Maintenance Menu Configure
mode to change the processor speed (if necessary). See “Maintenance Menu” in Section 2
and “Changing the Processor Speed” in Appendix B for more information.
System BIOS
The system BIOS is from Intel, based on Phoenix Technologies Limited (PTL) Release 6.0.
This ISA- and PCI-compatible BIOS is contained in a flash memory device on the system
board. The BIOS provides the Power-On Self-Test (POST), the system Setup program, a
PCI and IDE auto-configuration utility, and BIOS recovery code.
The system BIOS is always shadowed. Shadowing allows any BIOS routine to be executed
from fast 32-bit DRAM on the system board, instead of from the slower 8-bit flash device.