Computer RAM is the best known form of memory your computer uses to temporarily store and access data. From the time you turn on your computer, your CPU is constantly using memory (RAM). Every time something is opened or loaded, it gets placed into RAM. This means it is put into a temporary storage area so the CPU can more easily access the information. From there it becomes a continuous cycle where the CPU requests data from
RAM, processes it and then writes new data back to RAM. In most computers, this transfer of data between CPU and RAM happens millions of times every second. When an application is closed, the application itself, along with all its accompanying files is deleted from RAM. This is to make sure there is room for new data, so unless the changed files are saved to a permanent storage device, they will be lost.
SDRAM 168 Typically only used in older and slower computers.
RD RAM 184 Only used in certain Pentium 4’s with certain Intel chip sets.
DDR 184 Faster version of SD RAM used in Pentium 4’s and Athlon
DDR2 240 Newer version of DDR RAM with higher clock frequencies
DDR3 240 Newer version of DDR2 with higher clock frequencies
Upgrading Computer RAM
When looking to upgrade your computer’s RAM, you will find RAM information typically displayed like this:
1GB, 240-pin DIMM, DDR2 PC2-5300,
* 1GB refers to the size of the memory
* 240-pin refers to the number of pins used to connect to the motherboard
* DIMM- Dual In-line Memory Module
* SIMM- Single In-line Memory Module
* DDR2 refers to the type of memory
* PC2-5300 refers to the module type
Some other pieces of information you might find in a RAM description are:
* Clock frequency-refers to speed of the RAM in MHz (800MHz)
* CAS (Column Address Strobe) Latency-refers to the number of clock cycles that elapse from the time the request for data is sent to the actual memory location until the data is transmitted from the module. This is represented by a set of 4 numbers also known as RAM timing (4-4-4-12). These numbers stand for:
* TCL - CAS Latency Time
* Trcd - DRAM RAS# to CAS# Delay
* Trp - DRAM RAS# Pre charge
* Tras - Pre charge delay
Normally the BIOS will allow a user to adjust RAM timing to increase performance and stability.
Computer RAM
RAM is considered the most critical component in a computer system. Every bit of data must pass through RAM to get to the processor. Generic, low-cost RAM is most often the cause of data corruption and program crashes, so never skimp on the quality of RAM when upgrading. Make sure the RAM you choose is considered Grade A. Grade A RAM can only be found through major manufacturers, such as: Crucial.com.
COMPUTER HARD DRIVE KNOWLEDGE
A Computer Hard Drive is a form of Computer memory used to permanently store files and programs. Computer Hard Drives can also be referred to as; Hard Disk Drive. When using Microsoft windows a hard disk drive is often referred to as the c-drive. Most PC Hard Drives are stored in a internal drive bay at the front of the computer. Hard drives are connected inside the computer using a ATA, SATA or SCSI cable and a power cord.
There are several types of Hard Drives; some are IDE, SATA and SCSI:
1. IDE Hard Drive: (Also known as an ATA or PATA Hard Drive.) This is one of the most common drives used in computers. You can identify an IDE Hard Drive by having a 40 pin connector and a power connector.
2. SATA Hard Drive: (Also Known as Serial ATA). Very similar to an IDE Hard Drive but uses a higher speed. You can identify an SATA Hard disk by having a smaller power connector than IDE.
3. SCSI Hard Drive: SCSI Hard Drives are faster than IDE and SATA, but are more commonly used in servers due to higher cost. You can identify a SCSI Hard Disk at the connectors. (SCSI uses the same power connector as IDE.
There are four main components to a Hard Drive:
1. Platters: Aluminum, glass, or ceramic dishes coated with magnetic media. These dishes are used to store data and begin to rotate when the computer is turned on.
2. Head Arm: (Also known as a “Actuator Arm”) The Head Arm is similar to the arm on a record player. It allows the Hard Disk Drive to move the read / write heads to the location where the information needs to be read or written to.
3. Chassis: (Also known as the “Case”) A housing that helps protect and organize all components that make up the Hard Disk Drive.
4. Head Actuator: An electronic device controlled by a motor that moves the Head Arm to locations where it is needed.
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