Chapter 1 Hardware Installation
3
Overview,
Continued
CPU Thermal Monitor The Apollo IV motherboard includes a special heat sensor under the
CPU that monitors the CPU temperature. This heat sensor generates an SMI
(System Management Interrupt) when the CPU temperature is too hot. The
SMI can be set to turn on the external cooling fan and/or lower the CPU clock
frequency. You are waned that the CPU is overheating. The CPU is returned
to normal operating conditions when the CPU temperature returns to normal.
This feature can only be implemented if a power supply with a soft-off power
controller is installed in the computer. See the American Megatrends DMI
Wizard 95 User’s Guide for additional information about this feature.
SDRAM
The Apollo IV motherboard provides two 168-pin DIMM system memory
sockets that support SDRAM (Synchronous Dynamic Random Access
Memory). SDRAM increases the CPU-to-memory data transfer rate to 528
MBs. This rate is normally 264 MBs if EDO DRAM is installed. The
integrated I2C controller optimizes the memory timing parameters.
System Memory The motherboard supports up to 256 MB of system memory mounted on the
motherboard as follows:
Type of System
Memory Socket
Type of System
Memory
Supported System
Memory
four 72-pin SIMM
sockets
Fast Page Mode or
EDO DRAM
8 MB, 16 MB, 32 MB,
64 MB, or 128 MB
two 168-pin DIMM
sockets
EDO DRAM or
SDRAM
8 MB, 16 MB, 32 MB,
64 MB, or 128 MB
Cont’d
