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PC133 SDRAM

With the ever present push for performance, processors, motherboard buses and other computer system components have seen dramatic speed increases. With that, memory technology has been making some leaps of its own. In 1995 memory speed jumped from 33MHz to 66MHz with the release of EDO memory. In 1997 we saw SDRAM speeds jump to 66MHz with the release of PC66 SDRAM, and shortly thereafter the engineers moved the speed lever again, this time to 100MHz with the release of PC100 in 1998. Engineers, though, were not ready to quit just yet, as barely a year later, in 1999, we saw the release of PC133 SDRAM, with memory speeds running at 133MHz and higher.

During 1999 and 2000 we saw dramatic changes in the engineering and development of memory technology with the release of RDRAM (Rambus^®) memory running at 800MHz and DDR SDRAM running at 266MHz. In spite of these new advances though, PC100 and PC133 SDRAM, is not dead by a long shot.

PC133 SDRAM must be manufactured to meet the specific standards set by Intel.

 

PC133 Modules

Synchronous Dynamic Random Access Memory (SDRAM) delivers bursts of data at very high speeds using an interface that is synchronized to the CPU clock. SDRAM emerged in 1996, and represented a big step forward from EDO technology. When manufactured, PC133 SDRAM, must meet Intel's requirements (the PC133 Standard) for use with motherboards having a 133MHz FSB (front side bus). PC133 compliant SDRAM is almost always a requirement in Pentium III, AMD Athlon and Power Mac G4 based systems. This link will provide you with a review about Memory Speed.

While PC133 SDRAM can be used with motherboards having a 100MHz front side bus, your memory will only operate as fast as the slowest "link" in your system, in this case the motherboards 100MHz front side bus. As an example, if you were to install a PC133 module in a system with a 100MHz FSB, or in a system already containing a 100MHz module, the PC133 module will operate only at 100MHz. PC133 SDRAM is available only in the form of a 168-pin DIMM (as it pertains to personal computers).

Below are some of the terms you may see in those descriptions. You will also find additional definitions in our Memory Knowledgebase.

You can use our PC133 memory in your 100MHz FSB, and 66MHz FSB Motherboards that support 168-Pin DIMMs, basically if you need PC100 SDRAM memory or PC66 SDRAM this memory DRAM is also good to use on your PC.

 

Compatibility note: To find PC133 memory upgrade compatible with your particular system please see our Memory Configurator.

Memory types like SDRAM, DDR, and Rambus RDRAM are found in most of today's computer memory applications:

• SDRAM - Synchronous Dynamic Random Access Memory;
• RDRAM - Rambus Dynamic Random Access Memory;
• DRAM - Dynamic Random Access Memory;
• RAM - Random Access Memory;
• DDR - Double Data Rate is a type of SDRAM in which data is sent on both the rising and falling edges of clock cycles in a data burst.
• DIMM - Dual in-line memory module. This physical property describes a module with signal and power pins on both sides of the board. DIMMs can be any number of pins including 144pin SODIMM SDRAM, 168pin SDRAM memory, and 184pin DDR SDRAM.
• Unbuffered - This is the most common configuration for memory. These modules do not use any supporting TTL logic.
• ECC - Error Correcting Code. Logic designed to detect and correct memory errors. Memory modules designed with 72 bits of memory support the motherboard's ECC function.
• Registered - Registers delay memory information for one clock cycle to ensure all communication from the chipset is collected by the clock edge, providing a controlled delay on heavily loaded memories. This allows you to installed four or more modules or larger memory sizes in your application. Registered and non-registered memory can not be mixed.