What type of memory do I need?

  bill sykes 11:25 06 Aug 2003

Hello, I have decided to double the amount of DDR memory I have by buying an extra 256mb from Crucial. Their web site details 3 different types for my mobo (AOpen AK77 Pro(A))
and I don't know what the differences are. Can you please explain what the details below mean, ie unbuffered/registered, ECC/Non Parity, 32Meg x 72/64?

256MB DDR PC2100 ? CL=2.5 ? Unbuffered ?
ECC ? 2.5V ? 32Meg x 72 ........CT3272Z265

256MB DDR PC2100 ? CL=2.5 ? Registered ?
ECC ? 2.5V ? 32Meg x 72 CT3272Y265

256MB DDR PC2100 ? CL=2.5 ? Unbuffered ? Non-parity ? 2.5V ? 32Meg x 64 ......CT3264Z265

The following detail of my system is from Aida32:-
Module Size 256 MB (2 rows, 4 banks)
Module Type Unbuffered
Memory Type DDR SDRAM
Memory Speed PC2100 (133 MHz)
Module Width 64 bit
Module Voltage SSTL 2.5
Error Detection Method None
Refresh Rate Normal (15.625 us), Self-Refresh
Highest CAS Latency 2.5 (7.5 ns @ 133 MHz)
2nd Highest CAS Latency 2.0 (10.0 ns @ 100 MHz)

Also, does this meory come in one stick? Thanks in advance for any help you can give.

  The Transporter 11:42 06 Aug 2003

Cas Latency

click here

Unbuffered, buffered

click here

2.5v is the voltage it uses

32meg x 72 see above second link

ECC see above as well

Hope it helps

  bill sykes 12:13 06 Aug 2003

just hope I have understood it all correctly. Thanks for the link,The Transporter, it is very useful, should help others too.

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