Sun T2 chips vs SPARC64 VI/VII chips for Oracle database servers

We have recently found poor performance of Sun T5240 servers where (against previous V series servers with similar gross I/O capabilities on the disk volume)the timings for the recovery of the database, and the subsequent re-build of the tables and materialised views, are variable from slightly worse to atrocious. Given that the clock-speed is similar,and all significant oracle database parameters are the same, we couldn't see why these processes should take longer on the T5240. The statistics report from the database showed no I/O bottleneck on the new machine, instead it showed raised CPU times for some of the key slow statements.
We found the attached oracle metalink document (ref 781763.1) <<Sun_T2_slow_for Oracle_DB.html>>
Seems to be that if you can't control the content of large long-running SQL statements to parallelise them, don't buy a T-series box as the multithreading capability will work against you.
Therefore we are looking at new servers to run other similar large Oracle apps and appear to have a number of choices within a similar price range
Notably
M3000 - 1 x SPARC VII CPU (quad core procesor)
M4000 - 2 x SPARC VI CPU (dual core processor)
as opposed to the
T5240 - 2 x T2 CPU (8 core processor)
Question is which of these CPU/Core combinations works best...are there performance figures? What's the difference between CPU's and number of cores?
Any benchmarks to help us decide? Anyone experienced similar or tried these different combos for themselves?

We tested a T5210 as a database server (running Ingres, not Oracle) and our batch performance was roughly equivalent to a dual CPU UltraSPARC III V480. Our guess is that the performance hit came from having a relatively small cache shared across so many threads. Like you, we're looking at using the M3000 or M4000 in preference.

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