Компьютерная память SDR SDRAM (RAM PC-133 Bus Speed 1 модуль)

Selecting the Correct PC133 RAM For Your Computer

RAM, which stands for Random Access Memory, is a type of computer memory that temporary holds commands and data that are currently running on the computer. RAM is one of the most important parts of your computer when it comes to performance. The more memory your computer has, the more commands it can execute simultaneously. Before purchasing additional PC133 memory for your computer, you need to understand what type of RAM it can use.

What Specs Do I Need To Evaluate?

  • Capacity: Each chip of RAM has a capacity measured in MB or GB. For example, a PC133 SDRAM module can have a capacity of 256 MB or 512 MB.
  • Clock speed: This is the speed of the RAM and it is expressed in MHz. SDRAM clock speeds increased from 66 MHz to 100 MHz and are currently at 133 MHz. Another way to refer to these speed grades is PC66, PC100, and PC133. DDR memory has speeds of PC1600, PC2100, PC2700, and PC3200, while RDRAM comes in PC600, PC700, PC800, and PC1066 grades.
  • ECC: Error correcting code memory is able to detect and correct single-bit data errors in memory. ECC memory is typically used in servers and other computers containing critical data.

What Types of Computer Memory Are There?

The main types of memory are SDRAM, DDR, and RDRAM.

  • SDRAM stands for Synchronous Dynamic RAM. It has an upper limit of 133 MHz or PC133, which makes it faster than conventional DRAM. While DRAM operates asynchronously, SDRAM is synchronized with the processor clock, allowing it to operate more efficiently. PC133 SDRAM can come in various capacities, including 256 MB, 512 MB, and 1 GB.
  • DDR, or Double Data Rate, is another type of SDRAM, which superseded the basic SDRAM. There are several generations of DDR - DDR1, DDR2, DDR3, DDR4, and DDR5. As the name implies, this type of RAM has data transfer rates twice as fast as traditional SDRAM. DDR chips come in capacities of 2 GB, 4 GB, and 8 GB.
  • RDRAM stands for Rambus DRAM. This type of SDRAM comes in three grades - PC600, PC700, and PC800.

What is DIMM vs. RIMM?

There are two major form factors of DRAM - DIMM and RIMM.

  • DIMMs, or dual in-line memory modules, are 64-bit modules. There are two types of DIMM. SDRAM PC133 modules come with 168-pins and run on 3.3 volts. DDR modules have 184-pins and run on 2.5 volts. The SDRAM chips have two rectangular notches on the bottom edge and the DDR modules have just one.
  • RIMM stands for Rambus in-line memory module and is the form factor of RDRAM. RIMM modules have 184-pins and SO-RIMM chips come with 160-pin connectors.

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