Memory chips FYI 2004-06-01 - By Tony Owen
Back
Here's something I didn't know. I bought a new board and had 2 Ghz of RAM
installed. I run a utility and this is what I get:
Tip T2545 - Large memory modules (256MB or greater) should be
Registered/Buffered, especially if more than 2 are installed on the same
channel. This improves signal quality by reducing the load on the chipset
channel. While these modules add an extra clock delay due to the on-board
buffers (thus CL2 effectively becomes CL3), the stability will be worth it.
Server chipsets with many memory slots generally require Registered memory.
Fix: If you plan on adding more memory, consider replacing the modules with
Registered/Buffered modules. Do note that you cannot mix Unbuffered and
Registered/Buffered modules on the same channel, but you may be able to if
the chipset has multiple memory channels.
Tip T2546 - Large memory modules (512 or greater) should be ECC/Parity.
Since the probability that a bit will be corrupt is the same or increases
with module density, the bigger the module, the bigger the overall
probability that you will get one or more corrupted bits. While these
modules add an extra delay on partial writes (e.g. less than data width) as
parity for the whole line must be re-calculated, the stability will be worth
it.
Fix: If you plan on adding more memory, consider replacing the modules with
ECC/Parity modules. Do note that running plain and ECC/Parity modules will
turn off ECC/Parity for the whole memory array.
SiSoftware Sandra Help File
With all the stability issues that people have with tS, these facts may play
a roll.
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