Okay, 128K disk cache this time.
Power Mac 6500 225MHz, 256KB L2, 136MB RAM (64MB + 64MB + 8MB added onboard), CSII NIC, onboard GPU, no PCI cards. Running a fairly recent install of Mac OS 9.2.2 on the BlueSCSI for some consistency between runs. Virtual Memory and AppleTalk were off.
SD adapter...