ddr and sdram

I can't tell you what the acronyms mean but, yes, they are different but very much similar..... sdram is an older, slower (meaning that it runs at slower clock speeds) RAM and used now-in-days in older PCs and laptops (note that laptop sdram is different from PC sdram and is not compatible.....)). DDR is a more current RAM is a more current and usually run at moderate speeds such as 333Mhz to 400 Mhz. The physical differnce between SDRAM and DDR is that SDRAM has an extra notch.... I'm pretty sure that sdram can fit into ddr mobo slots but not vice versa....

There is DDR2, and I think through 4? that run at faster speeds and are considered 'gaming memory'.....
 
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DDR runs in dual channel mode (2, 4, 6, 8 sticks needed) to improve read/write rates. DDR2 just runs at higher frequencies (533MHz, 800MHz, 1033MHz). SDRAM doesnt work in dual channel mode, its speeds are slower, and hence it isnt used anymore for new computers.
 
DDR runs in dual channel mode (2, 4, 6, 8 sticks needed) to improve read/write rates.
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Not always. Dual channel was added in the 865/875 chipsets (for DDR, RAMBUS was dual channelish) on the Intel side and I believe the nforce2 was the first AMD chipset to have it.

Strictly speaking, DDR should be written DDRSDRAM or double data rate synchronous dynamic random access memory, to get un DDR remove double data rate. But who wants to type that all out all the time.

DDR means that the frequency everyone writes down (DDR400 for example) is double the actual frequency of the RAM, the RAM transfers 2x per clock cycle.
 
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