http://www.ibm.com/developerworks/aix/library/au-dutta_cmds.html

Here are some of the commands

How many processors does my system have?
To display the number of processors on your system, type:

$ lscfg | grep proc
+ proc0 Processor
+ proc2 Processor
+ proc4 Processor
+ proc6 Processor
+ proc8 Processor
+ proc10 Processor
+ proc12 Processor
+ proc14 Processor

How much real memory does my machine have?
To display real memory in kilobytes (KB), type one of the following:
$ lsattr -El sys0 -a realmem
realmem 10485760 Amount of usable physical memory in Kbytes False