PB520 Cache Upgrade

Caution Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty.
 
Write back cache
16KB Internal Cache (integrated into the CPU)

256KB Secondary External Cache (Soldered on-board)

Not upgradable.