Sounds like that TT is running with the 48Mhz bus but with
CPU at 1.5x times the speed. I know the very
old TTs ran with CPU at 16Mhz and Atari quickly
double clocked it to 32Mhz, probably not gaining that much
extra speed as it must use waitstates or switch down to
access the bus. Could access Fast RAM at full
speed I guess.