Re: Memory again

Paul wrote:
Hipupchuck wrote:
Why don't my MB recognize this memory?
MDD333-128X72R MEMORY PC2700 (333MHZ BUS) 1024MB ECC REGISTERED DDR 128X72

It calls for ddr, this is ddr.

If you tell us the motherboard, it makes it easier to answer.

In your description, are the words "ECC REGISTERED". The "REGISTERED"
word, means there is a latch on the address bus, which delays the
address by one cycle, and also serves the function of buffering
the signals. That isolates the loading of all the memory chips, from
the system bus, so that more of them can be driven.

And that is a process typically used on "server" motherboards.

These are common memory types.

1) Unbuffered ----------- desktop systems
2) Unbuffered with ECC --- desktop systems (where it is important to catch errors)

3) Registered with ECC --- server systems (can be twice as many memory sticks, and
with the ability to catch errors, the operators know when
the machine is sick).

You want (1), and not (3) which is your ECC REGISTERED stick.

The user manual may give some idea what type(s) are supported.
Or a visit to Crucial or Kingston.com, and the usage of their
search engine, can give you some ideas as to what memory is
usable.

The memory you describe would be more at home in a server. When
you plug an ECC REGISTERED stick into an Unbuffered motherboard,
the BIOS has the option to "beep" to show it is displeased at your
memory choice. It could simply ignore the stick, and not
send any cycles its way, but it is better for it to "beep", so
that the user will understand that the stick should be unplugged.

Always change memory with all power removed from the computer.
I unplug the computer, as a means of reminding myself that the
power is completely off. Some motherboards have a green LED, and
if the green LED is glowing, power is still present. On those
motherboards, if the green LED is off, then it is safe to
change the memory. But my current motherboard doesn't have a warning
LED, so I have to be more careful with it, and just pull the power
cord for safety.

HTH,
Paul

I think they are all vampire devices. I always use the power strip switches to shut things down. Monitors and all those plug in transformers are always on unless you cut the power strips.
.

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