DDR SDRAM and SDRAM
DDR memory has 184 pins, where as SDRAM has 168 pins. DDR
Memory is a new type of SDRAM that is able to double the read / write speed
of the previous generation of SDRAM memory. There are currently,
PC2100 (DDR266), PC2700 (DDR333), PC3200 (DDR400), PC4200 (DDR533)
These DIMMs are 184 Pin in size and are not interchangeable with older SDRAM
modules.
The evolution of DDR SDRAM
During the 90s, there was a sudden shift in the PC market towards the Athlon and Duron, Durron can be attributed to AMD's lower costs when compared to its primary competitor, Intel. The Pentium III processor which Intel had on the market at the time of this shift in market share did not appear as leading-edge as the Athlon or the Duron. In recent reviews on the web, as well as in the traditional printed medium, the Intel Pentium III and the Celeron processors were found to be slower in certain benchmarks (when compared alongside the same MHz clocked AMD Athlon and its lesser priced Duron). With these encouraging reviews and strong performance showings, along with the quick acceptance towards its cpu's from the buying public in a matter of months, AMD was able to gain a very strong following with its processors. This shift was attributed primarily to its aggressively priced products and its very strong performance. Another reason for Intel's slip in the PC market can be attributed to its own insistence in pushing the technology envelope unto its consumers. This happened whether the customer was willing to accept the latest advancements or not. Mainly this revolved around a deal Intel had signed with Rambus Ram so that would develop its chipsets and processors to work alongside Rambus Ram technology exclusively. This new partnership encountered a few major setbacks. First there was resistance by the general buying public and small businesses due to Rambus's extremely high memory costs. Another incident which really hurt Intel's future share of the marketplace was their i820 chipset. This chipset which was originally developed to support only RDRAM (Rambus RAM), was found to have a bug in its design when matched with an MTH (Memory Translation Hub), that allowed the use of SDRAM, which would ultimately cause serious data corruption or loss in certain circumstances.
This major technological gaffe coincided with the sudden shortage of higher-clocked CPU's such as the 1.0GHz which Intel made available only to its select few major Tier-1 OEM PC manufacturers (ie. Gateway, Dell, Compaq). This caused a major public relations fiasco for the once solidly-designed CPU/chipset technology firm.
AMD stepped in at the right time with a large and steady supply of its processors. The PC market was ready for faster CPU's and AMD was more than able to produce them in high yields. AMD was able to provide faster clocked processors to the buying public much quicker than its competitor, Intel. Intel did not have, nor could it produce Pentium III's in large quantities at the time. This allowed AMD to continue grabbing a larger share of the processor market that was once owned exclusively by Intel.
Now that AMD was considered a major competitor to Intel in the processor market, VIA a Taiwanese chipset manufacturer developed a much more stable chipset. The less expensive chipset supported AMD cpu's and were able to offer features which Intel's own aging BX chipsets weren't able to provide. Intel's i820 couldn't survive long enough for the general public to purchase or accept: PC100/ PC133 SDRAM; ATA 66/ ATA 100; 4x AGP support.
VIA soon replaced their original AMD-only KX133 chipset, and improved upon its design with their current KT133A chipset which supports the newer Athlon's running at 200MHz or 266MHz FSB (Front Side Bus).
As mentioned earlier, AMD wanted to specify a new type of RAM which would provide a higher memory bandwidth when compared to the current bandwidth limited SDRAM platform - enter DDRAM. DDR Memory is a new type of SDRAM that is able to double the read / write speed of the previous generation of SDRAM memory. There are currently, PC2100 (DDR266), PC2700 (DDR333), PC3200 (DDR400), PC4200 (DDR533) These DIMMs are 184 Pin in size and are not interchangeable with older SDRAM modules.
What is DDR memory?
Why DDR Memory? What DDR Memory to buy?RAM Influence on Computer Performance
Memory Chipset Specifics (Intel, Via Apollo, SIS, AMD Chipsets)
How
Computer Memory Works?
How
much RAM is enough?
System
RAM Upgrade Issues
Websites
that sell Memory Upgrades
