Registered DRAM and motherboards __?__

[Soulkeeper]

here is a snip from the specs on a motherboard

#########--------------------starts_here-------------------------##############

It is one of the few boards that features 4 DIMMs (Supports 6 banks up to 3 GB DRAMs (512Mb x8/x16 DRAM technology)
for un-buffered DDR SDRAM module Supports 8 banks up to 4 GB DRAMs (512Mb x8/x16 DRAM technology) for register
DDR SDRAM module No ECC function support),

########------------------------ends_here-------------------------#############

i have noticed that quite a few of the motherboards with 4 memory slots seem to support more memory if it is buffered than if it is not

1)My main question is why is this the case ???

Other questions include:

2)And what exactely is the diff between registered and un-buffered (unregistered? non-ecc?) ????

3)Does all registered memory support ECC ???

Note: I do however understand what ECC is and have a basic understanding of how it works

4)Why would a board support registered memory but not ECC ??

5)Why do they call it registered memory anyways ??


--Soul_keeper
ps thanks for putting up with my badgering

 

[bozo1]

1. Timing issues.

2. FAQ Another FAQ

3. No

4. Up to the manufacturer.

5. See #2.

 

[Soulkeeper]

Thanks bozo1 that pretty much answered everything