PC-133 is a type of SDRAM.
System memory, or random access memory (RAM), is memory a computer needs to run applications. RAM is connected to the CPU by the motherboard's front side bus (FSB). The FSB's speed determines the type of RAM that can be supported by the motherboard.
SDRAM
PC-133 is a type of synchronous dynamic random access memory (SDRAM). Synchronous RAM speed is based on the motherboard's clock speed. Clock speed is the frequency at which the computer's processor executes commands. The "clock" is actually a quartz crystal that vibrates in response to electrical stimulation. Dynamic RAM has replaced the earlier static RAM.
Speed
PC-133 runs at 133 MHz, which is the speed of the FSB. This was the maximum speed of first generation SDRAM.
Capacity
PC-133 SDRAM comes in modules of 64 megabytes, 128 megabytes, 256 megabytes, 512 megabytes, and 1 gigabytes capacities.
Densities
PC-133 256 megabytes RAM modules can be made with four, eight, or 16 memory chips. The modules can be single or double sided. The memory chips on four-chip modules are 64 megabytes each. The memory chips on the eight-chip modules are 32 megabytes each. The memory chips on a 16-chip modules are 16 megabytes each. Four-chip modules are high density and are generally cheaper. Sixteen-chip modules are low-density and tend to be more expensive.
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