What kinds of RAM are available?
EDO (Extended Data Out) RAM was the most popular memory until a few years ago. It is packaged on SIMMs, which must be upgraded in pairs. EDO RAM supports bus speeds up to 66 MHz. But when faster bus speeds became necessary, a new type of RAM, SDRAM, or Synchronous Dynamic RAM, became the standard, and still is the most popular type of RAM. It is available in PC66, PC100, and PC133 versions. Most RAM sold today is SDRAM, packaged on DIMMs. Rambus memory The Pentium 4 chip requires a different type of RAM, called RAMBUS, or RDRAM. It is a very high speed type of RAM, befitting the high clock speeds of the Pentium 4. Rambus memory is able to achieve effective data transfer speeds of 800MHz and higher. All memory slots in a Rambus motherboard must be filled. Even if all the memory is contained in a single module, the unused sockets must be populated with a PCB, known as a continuity module, to complete the circuit. Rambus DRAM modules are known as RIMM modules (Rambus Inline Memory Modules
