I know it's a bit too late, but here are unpatched 7.2b3 and patched 7.2b4 results for pgbench scale factor 50 on a 8 MIPS r10000 sgi-Irix machine with 1Gb hope it helps
pgsql-hackers by date:
Соглашаюсь с условиями обработки персональных данных