System memory chips are located on the board between the main CPU STB7100 (biggest chip with passive
cooler glued on it) and the front panel

and:

PLL1 : 531.00MHz
PLL2 : 400.00MHz
ST40 CPU : 265.50MHz
ST40 BUS : 132.75MHz
ST40 PER : 66.37MHz
SLIM : 265.50MHz
ST231 : 400.00MHz
STBUS : 200.00MHz
EMI : 100.00MHz
LMI : 200.00MHz <---- look at this