HI Jim
         Well beside the mail difference between IOS and PIx Firewall that you have mentioned is that IOS Firewall is a part of Security implementation whereas PIX Firewall is completely a Firewall Solution for an Organization.It  can support from 64,000 to 256,000 simultaneous connections.Its specially designed algorithms like Adaptive Security Algorithm which is the heart of PIX firewall,makes it the perfect Firewall solution and also the Cut through Proxy Feature makes it the most secure firewall.The PIX firewall Manager is a Java based application that makes it easier to maintain the highest security in an easy way. These features are not provided in the IOS.
 
Hope this helps

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