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I am not the most authorative person to answer this:
Datasheets such as http://www.oracle.com/us/products/servers-storage/servers/sparc-enterprise/t-series/sparc-t4-2-ds-487859.pdf indicate the T4 for database workloads
I guess you have alo found http://www.oracle.com/us/corporate/features/sparc-t4-announcement-494846.html
Basically there are times with a database that a thread wants to do a lot of CPU work .... on a T3 this ends up on one thread on one of hte cores.
On a T4 ... providing the core's are not fully utilitized, the thread requiring a lot of CPU should be allocated a whole core to itself .... and run much more quickly.
So for instance starting or upgrading a single databse on a T4 should run much much faster on T4 as opposed to T3. And that probably is the case of a failover also.
Anyway to give a couple of not so simple answers (and these are my personal answers):
- Can one use a T3 for RAC .... yes but it iisn't recommended and failover and other operations may be lenghtly.
- Can one use a T4 for RAC .... yes ... it will certainly outperform a T3. Is it recommended ... (pass ... ask the salesman).
... I am happy for others to add comments.