Matching cpus in a dual-cpu system

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I am building a dual-cpu system with a P3 733EB or 933EB. Initially, I will only buy one cpu but later I will add the second. What do I need to look for when buying the second apart from ensuring that it is the same model (733EB or 933EB)?

 

[Cosmic_Horror]

it is generally recommended that you get the same stepping of the same model..

say you have a p3 733eb and it has a cBO (or what ever the stepping is) you should get the same stepping so they will be compatable.

some steepings may not work in a daul setup.