The hardware can be dissimilar. You tend to want to get the same servers, but this isn't a requirement (we have a 4/700 and a 4/900 clustered, for instance). As long as the lowest end server is capable of handling the load, that's what you're looking for.

K. Brian Kelley

http://www.truthsolutions.com/

Author: Start to Finish Guide to SQL Server Performance Monitoring

http://www.netimpress.com/shop/product.asp?ProductID=NI-SQL1