Enterprise-III EISA VLB Motherboard User's Guide
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Power Considerations
Power Supply Requirements
The American Megatrends Enterprise-III EISA motherboard re5V, -5V, +12V, -12V, and about 44
Amps maximum.
Power Consumption
The four SIMM memory banks consume 2 Amps each, for a total of 8 Amps.
Each EISA expansion slot is gated at 4.5 Amps maximum. There are eight EISA expansion slots, so the
total power consumption for EISA expansion slots is 36 Amps. The total maximum power consumption is
44 Amps at +5V with a 220 Watt power supply.
Power Source
Three power connectors (P1, P2, and P3) are provided on the Enterprise-III EISA motherboard. These
connectors provide seven +5V connects. Each is rated at approximately 5 Amps. The total power
consumption for all three connectors is approximately 35 Amps.
Conclusion
The minimum rating of the power supply should be 230 Watts for a fully loaded motherboard, including
a 12V power source. The maximum power consumption on each EISA slot is 4.5 Amps at 5V.