Memory

Today the most commonly used memory types are:

• DDR SDRAM (Double Data Rate Synchronous Dynamic Random Access Memory) MOST POPULAR
• DR DRAM (Direct Rambus Dynamic Random Access Memory) TOO MANY CONFLICTS
• SDRAM (Synchronous Dynamic Random Access Memory) FADING AWAY

This is an older type of computer memory.

SDRAM is used for cheap computers because of low prices and sufficient speed for office usage.

The most common frequencies for this type of memory are 66MHz (PC66), 100MHz (PC100), and 133MHz (PC133).

PC66 SDRAM can be working at 533 MBps, PC100 at 800 MBps, and PC133 at 1.06 GBps.

However, there is no long-range outlook for this type of memory. In consideration of the same cost price of DDR SDRAM, there are no chances for a long life of SDRAM. Moreover, the performance of today systems using the SDRAM is reduces up to 30%.

DDR SDRAM

This is the most popular type of computer memory.

DDR SDRAM is used for the most types of motherboards (exception are the Socket 370 motherboards which use SDRAM for memory chips).

Today there are the following types of DDR SDRAM:

• DDR200, PC1600
• DDR266, PC2100
• DDR333, PC2700
• DDR400, PC3200
• DDR433, PC3500

DDR SDRAM chips are designated by the system bus frequency (FSB) from 200 to 433 megahertz (MHz) as well as by the memory bandwidth from 1600 to 3500 megabytes per second (MBps).

DR DRAM (RDRAM)

Direct Rambus DRAM is called after the company which is designed this type of computer memory.

The difference of RDRAM is the bus width of 16 bit at the frequency of 800MHz, while the SDRAM/DDR SDRAM use 64-bit bus at up to 433MHz.

This is the very fast and reliable memory with the potential which is designed specially for Pentium IV platforms.

The only disadvantage is that this type of memory must be installed in pairs.