Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. PC66 refers to internal removable computer memory standard defined by the JEDEC. PC66 is Synchronous DRAM operating at a clock frequency of 66.66 MHz, on a 64-bit bus, at a voltage of 3.3 V. PC66 is available in 168 pin DIMM and 144 pin SO-DIMM form factors. The theoretical bandwidth is 533 MB/s. This standard was used by Intel Pentium and AMD K6-based PCs. It also features in the Beige Power Mac G3, early iBooks and PowerBook G3s. It is also used in many early Intel Celeron systems with a 66 MHz FSB.