Theory for RAM users

Introduction
Random Access Memory or RAM, the memory of computers, is a crucial component of your computing system. Even if one consider the computer as a whole, RAM will determine the overall performance. Generally, if the RAM is not compliant, the computer doesn't start at all.

Bad quality RAM will let your computer run but crashes it in critical situations of temporary overload. And this is precisely in these cases that your computing system should be reliable. Think about it before buying cheaper because this is undoubtedly synonym of less reliability.

Old and new standard
The old standard was called RAM SIMM (Single Inline Memory Module). It is easily recognizable with its 72 pins, without any notch because it can be inserted in both directions. EDO (Extended Data Output) standard, according to its name, should be pair-mounted.

The new standard is called DIMM (Dual Inline Memory Module). The density of the pinning is superior to the preceding standard with 168 pins and there are 2 asymmetric notches to avoid confusing the orientation the RAM has to be installed and the type. Indeed, NEVER try to insert RAM with the wrong orientation or your RAM unit could burn !

Synopsis
The general model for personal computers is SDRAM (Synchronous Dynamic RAM). Regarding the capacity in mega-byte, you can find units of

The speed of information treatment can be

Note: all these parameters are crucial to determine the correct compliant type of RAM for your computer. The general practical rule is that unbuffered is for PCs/ clients/ workstations and buffered is for servers.

ECC
Stands for Error Check and Correction. The last step of the technology is one or two additional chips checking and correcting the information. The RAM unit is thus, even more reliable in its computing capabilities.

Hyperlinks to RAM theory

• IBM
• HEWLETT-PACKARD
• ZD NET
• SIMPLE TECHNOLOGY
• CORSAIR MICROTECH
• CENTON
• Overview of the future of RAM (from APC)