1) POWER7 is the mainstream performance champ. There are some oddball Nehalem contenders from Fujitsu and Cisco. In general though, the POWER 780 kicks some tail and the 750 isn't far behind. (There are no data from the 770.)
2) Performance data from one 780 running AIX is very different from another 780 running System i. This has to do with the quirky little JVM for System i, I think.
3) The top 16 performers on a BOPS/core basis are all running the IBM J9 JVM. JRockit doesn't show up until 17. Of the top 30, 28 use the J9 JVM. This tells me that IBM has really caught up with the BEA guys in terms of JDK performance.