EMC P/N 300-002-803 User Manual

Installing the adapter

Servers have several different bus slot types for accepting adapters: 

◆

PCI

◆

PCI-X

◆

PCI-X 2.0

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PCI-Express

PCI slots can be 32-bit and 64-bit (denoted by their 124-pin or 188-pin 
connectors.) These slots have plastic "keys" that prevent certain 
adapters from fitting into them. These keys work with the cutout 
notches in the adapter edge connector so that only compatible 
adapters will fit into them. This is done because of the voltage 
characteristics of the adapter. Inserting a 3.3v adapter into a 5v slot 
would cause severe damage to both the adapter and the server. 
Therefore, the slot keys denote the type of voltage provided by the 
slot and effectively prevent a voltage incompatible adapter from 
being inserted.

 shows how PCI slots will appear with their keys and what 

type of voltage is provided for each slot type.