Registered or Non-Registered?
 

I have seen both those kinds of memory and different types of ecc and i have no idea what the difference of any of it is or what it does - Anyone care to help?

- Finx

Registered Memory: Kingston
SDRAM memory that contains registers directly on the module. The registers re-drive the signals through the memory chips and allow the module to be built with more memory chips. Registered and unbuffered memory cannot be mixed. The design of the computer memory controller dictates which type of memory the computer requires.

More indepth info from: Corsair

*Snip*
Gaming Systems: Registered memory not needed, may actually degrade performance slightly.
Servers: ALWAYS use registered memory. Most server boards require it. Plus, it will make it easier to add more memory later.
DDR Systems: Use registered modules if you will be installing more than two DIMMs.
High Performance Workstations: If you want a gigabyte of memory or more in your system, use registered memory (and a board that supports it!).
*Snip*

Laymens Terms: Registered memory is more stable but slower because it takes an extra clock cycle to process the buffered information.

ECC - Error Correcting Circuit - means it corrects any problems it finds with memory pages being read using the CRC. If this fails than the machine halts