"About the 128mb High Performance Rev3 PC133 222 module The new 128mb Rev3 is a PC133 CAS Latency 2 module guaranteed to run at 150mHz 2-2-2 (board and processor dependent). The Rev3 uses 8 16x8 chips in a 64mbit single sided configuration. The module includes a Serial Presence Detect (SPD) EEPROM chip. The module is an unbuffered, non-registered module currently unavailable as ECC. Built on Mushkin's new black 6-layer PCB board, these modules look as great as they perform!"