The Maximum Access Speed of DDR2 RAM
RAM stands for random access memory, the system memory a computer needs to run software and applications. Faster RAM means faster data transfer, which results in faster processing of applications.
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DDR2 SDRAM
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DDR2 (double data rate x 2) is a kind of SDRAM (synchronous dynamic RAM). The speed of DDR2 RAM is twice the speed of DDR RAM and four times that of regular SDR (single data rate) RAM.
RAM Speed
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RAM speed is based on the speed of the motherboard's front side bus (FSB). The FSB connects the RAM to the computer's processor. Regular SDR RAM speeds are equivalent to the FSB speed.
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DDR2 Speed
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DDR2 RAM transfers data four times per clock cycle. Therefore, the FSB speed is multiplied by four. DDR2 connected to an FSB of 100 MHz would have a speed of 400 MHz.
PC Numbers
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PC numbers for RAM modules are based on bandwidth. That means how many megabytes (MB) per second are transferred. This number is derived from the RAM speed multiplied by 8 MB per second.
PC2-8500
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The fastest type of DDR2 RAM is PC2-8500. The FSB speed for this type of RAM is 266 MHz, which is multiplied by four to obtain the RAM speed of 1066 MHz. Therefore, this type of RAM is also known as DDR2 1066. The PC2-8500 is bandwidth, which is derived by multiplying the speed times 8 MB per second.
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- Photo Credit Ventaglio di RAM image by Sebastiano Settimii from Fotolia.com
