Memory

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Extended Data Out (EDO)
Faster than basic DRAM because it can fetch another block of memory while it is sending the previous to the CPU.
Sychronous Dynamic Random Access Memory (SDRAM)
Sychronizes with the CPU's bus and can go up to 133mhz.
Double Data Rate (DDR)
Double the data through put of SDRAM buy handling the data at the rise and fall of the clock cycle.
Double Data Rate 2 (DDR-2)
Doubles the data through put of DDR because it has two simultaneous cells handling data.
RAMBUS
Created to replace SDRAM and compete with DDR-RAM; PC800 RDRAM operates at 800mhz and delivers 1600mb of bandwidth; however, it also was very expensive, over heated and had high latency. These are just some of the reason it did not take over the market.

Memory Interleaving
Technique used to compensate for slow SDRAM. It breaks up the memory into 2 or more sections, allowing the cpu to access the divided sections simultaneously.

ECC v. Non-ECC v Extended ECC
Error Checking and Correcting - When handling data, the memory checks for errors and corrects them if found.
Non-ECC - Does not have error checking and correcting abilities.
Extended ECC - ?

Buffered
Generally used in high end servers that houses a lot of memory. The buffers on the memory modules are there to help the chipset deal with amount of data traveling from the memory.
Non-Buffered
Opposite of Buffered, mainly used for workstations or non critical systems.
Registered Memory
Very similiar to buffered memory. Registered memory has registers that hold the data for one clock cycle before sending the data.

Hardware Compatibility List (HCL)
List of computer systems and peripherals that are compatible with Windows.

Memory Caching
Is SRAM that sits on the chipset and cpu that is used for data that is used a lot. SRAM does not need to be refreshed and is much faster than dynamic RAM

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