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Intel
®
440GX AGPset Design Guide
1-9
Introduction
1.4.2 General Design Recommendations
1. Intel recommends using an industry standard programmable Voltage Regulator Module
(VRM) installed in a VRM header or an onboard programmable voltage regulator designed for
Intel
®
Pentium
®
II
processors.
2. Systems should be capable of varying the system bus to processor core frequency ratio per the
System Bus to Core Frequency Multiplier Configuration table of the Intel
®
Pentium
®
II
processor datasheet. The Intel
®
Pentium
®
II
processor uses the following signals to configure
the internal clock multiplier ratio: LINT[0]/INTR, IGNNE#, A20M#, LINT[1]/NMI. Follow
the recommendations in this document to ensure that adequate hold times are met on the
strapping signals. Ensure the output of the strapping logic is a Vcc
2.5
logic level for connection
to the Slot 1 connector. This can be accomplished using an open-drain output driver with pull-
ups to Vcc
2.5
.
3. Please prepare for additional thermal margin for increases of 1-5W for higher performance or
otherwise enhanced processor.
4. Motherboard designs targeted for system integrators should design to the Boxed Intel
®
Pentium
®
II
processor electrical, mechanical and thermal specifications provided in the Intel
®
Pentium
®
II
processor datasheet, most notably the required fan power header, fan/heatsink
physical clearance on the motherboard.
5. Motherboard designs should incorporate a retention mechanism, retention mechanism attach
mount and heatsink support mounting holes and keep out areas for the Intel
®
Pentium
®
II
processor and boxed Intel
®
Pentium
®
II
processor.
1.4.3 Transitioning from Intel
440BX AGPset to Intel
440GX
AGPset Design
1. The 82443GX supports 2GB using 128M or 256M memory technology. The design guidelines
for MAA14 and MAB14 are the same as MAA-13 and MAB-13 on the 82443BX.
2. Intel
®
440GX AGPset supports 100 MHz system bus and 100 MHz SDRAM Memory only.
3. There is no 3 DIMM support with the Intel 440GX AGPset.