[SI-LIST] Re: Question on DIMM's

Sindey,

1. An unbuffered DIMM does not have a buffer for the ADDRESS ( A0-A13)  bits 
as it goes from memory controller to DIMM chips. Also it does not have the 
PLL for CK and CK#.

2. An Registered DIMM hase a register for the ADDRESS ( A0-A13)  bits as it 
goes from memory controller to DIMM chips. Also also  has PLL for CK and 
CK#. The PLL then distribute the CLOCK individually to each DDR SDRAM chip. 
This enhances the signal integrity of the differential CLOCK and the Address 
Pins.

3. A buffered device is used on old EDO or Fast Page Module. A register is 
used on SDRAM modules. So you will not find the term "buffred" DIMM often 
now a days. Instead you will find terms "unbuffered" and   "registered". 
Buffers and Registers drive or amplify signals as they enter memory module.

4. Registered Modules are costlier than unbuffred modules on account of two 
facts - first, they are low in demand , second they used additional buffer 
and PLL chips.

5. Owing to better signal integrity of the Registered modules they are 
expected to have better margins. They are used in  servers  and critical 
systems. Unbuffered DIMMs are used in mostly in Desktops. Although there is 
no rule that it can not be used on servers and workstations - the actual 
decision will be based upon how critical is the question of prevention of 
data.


V S


From: Sidney S <sidney16481@xxxxxxxxx>
Reply-To: sidney16481@xxxxxxxxx
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Question on DIMM's
Date: Fri, 31 Oct 2003 05:23:21 -0800 (PST)




Hello,

Could anybody provide more info on unbuffered , buffered, registered 
DIMM's?? What are the differences and advantages and disadvantages of each?

Thanks,

Sidney






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