Author Topic: What is the difference between SDRAM and DDR RAM?  (Read 124 times)

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Offline CyborgRepublic

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What is the difference between SDRAM and DDR RAM?
« on: November 03, 2008, 11:21:08 PM »
I\'ve seen a lot of computers with these specifications on their Desktops... So basically what is the difference between SDRAM and DDRRAM? Any idea?

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What is the difference between SDRAM and DDR RAM?
« on: November 03, 2008, 11:21:08 PM »

Mountain View

Offline Corps

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Re: What is the difference between SDRAM and DDR RAM?
« Reply #1 on: November 03, 2008, 11:23:17 PM »
SDRAM stands for Synchronous Dynamic Random Access Memory. DDR is short for "DDR SDRAM" and stands for Double Data Rate. Nowadays to avoid misunderstandings SDRAM is often specified as SDR SDRAM and SDR stands for Single Data Rate by analogy with DDR. Therefore, the main difference between SDR and DDR memory the doubled speed: DDR can transfer data at roughly twice the speed of SDRAM. For example, PC133 SDRAM runs at 133 Mhz, while 133 Mhz DDR effectively runs at 133 Mhz x 2 = 266 Mhz.

SDRAM has 168 pins and two notches at the connector, which prevents it from being used in a DDR SDRAM motherboard and vice versa. It comes mainly in PC66, PC100 and PC133; the bus speeds of the RAM in MHz.

DDR SDRAM has 184 pins and a single notch at the connector. It comes in speeds of PC1600 (166 MHz), PC1800 (200 MHz), PC2100 (266 MHz), PC2700 (333 MHz), PC3200 (400 MHz), and PC4400 (550 Mhz). The numbers represent the theoretical maximum bandwidth of the DDR SDRAM in Megabytes per second (MB/s). For example, PC2100 has a theoretical maximum bandwidth of 2100 MB/s.

Offline Transformer10

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Re: What is the difference between SDRAM and DDR RAM?
« Reply #2 on: November 03, 2008, 11:27:24 PM »
That\'s a nice question... i was also confused before but just to share... Dynamic Random Access Memory is used to temporarily store information on computers. DRAM is made up of many cells and each cell is referred to as a bit. A cell contains a capacitor and a transistor. Since computer machine language is made up of 1s and 0s, it has the value of one when active and zero when inactive.

SDRAM or Synchronous Random Access Memory is the result of DRAM evolution. This type of memory synchronizes the input and output signals with the system board. Its speed ratings are in MHz. SDRAM was introduced in 1996 and is still used today. SDRAM transmits every clock count at a specific time.

DDR RAM (or Double Data Rate Random Access Memory) does the same but it does so twice every clock count. This makes DDR RAM twice as fast as SDRAM. Over the years, RAM has become very fast and efficient -- and it will be exciting to see what\'s coming next.

 

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