There are Registered DIMM and Unbuffered DIMM.
When choosing a memory for business , which is better for the system ?
I mean,
Are there any software , applications, OS, which doesn't work if Registered DIMM is chosen ? or if unbuffered DIMM is chosen ?
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Registered DIMMs have a register seperating the system and the modules creating less electrical load on the memory controller allowing for more DIMMs to operate while keeping the system stable.
This is the same thing as saying they are buffered. An unbuffered DIMM connects directly to the memory controller and places more load on the system, limiting it to usually 4 memory modules

ECC is error checking and correction built into the RAM modules.

If you want a super-stable, rock solid, and scalable server platform, go with Registered ECC modules.

Software is completely independant of these features and they will not prevent software from running. It's all about hardware scalability and reliability.
Dave BaldwinFixer of ProblemsCommented:
Types of memory required are determined by the motherboard chipset.  You need to buy the type specified by the motherboard or system manufacturer.  If you put in the wrong type, the computer won't work, usually doesn't boot up.
Indeed what Dave said, the CPU/Chipset on the board will usually determine what type of memory is needed.

If it's just a standard PC motherboard, with 4 slots for RAM modules, you probably just need unbuffered, non-ecc ram. You also need to know what type of ram the motherboard takes, e.g. SDRAM, RDRAM, DDR, DDR2, DDR3.
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Neil RussellTechnical Development LeadCommented:
Only dependent on your Hardware, not software. What is the make/model of the computer? PC or server?
software will nevere know about the memory as its a chipset thing

you can get servers that do far better than ecc by way of ram mirroring hp had that in servers from 2005 imho


and other servere manufactures are doing a similar technolgy thats proper memory protection its kind of like memory raid
shouichiAuthor Commented:
Thank you for your comments.

I am asking this question because I need to choose memory for server.

I understand what everyone explain. it depend on the system specification.

How about performance ?
From a performance point of view, are there any difference between Registered DIMM and unbuffered DIMM ?
Are there any story if Redistered DIMM bring better performance or not.

Registered DIMM will be able to keep system good condition compared with Unbuffered DIMM ?

Are there any general condifion that mission critical system should work on the Registered DIMM ?
registered or buffered has ecc where as unbuffered/unregistered does not
unbuffered memory is slightly faster but ecc gives you some protection in the dimm

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Dave BaldwinFixer of ProblemsCommented:
"difference between Registered DIMM and unbuffered DIMM "

Yes, in your system one will work and the other will Not.  It is not your choice.  Look up your system specs, that is all that matters.
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