Testing with Adobe LiveCycle ES shows that performance on servers that carry Sun UltraSPARC T1 and T2 processors is not great. IBM's Processor Value Unit (PVU) calculation bears this out.
PVU is used by IBM to license its middleware and is based on the relative performance of processors. IBM assigns a PVU of only 30 to the T1, 50 to the T2 but 100 to the UltraSPARC IV. SPARC64 VI and VII processors also get a PVU of 100.
If you plan to deploy LiveCycle on Solaris on SPARC, you will get more value for your money by deploying it on servers with UltraSPARC IV, SPARC64 VI or VII processors. The new (Nov 2008) M3000 family of SPARC Enterprise servers carry SPARC64 VII processors.

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