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I tried installing some Crucial 1024MB PC5400 DDR2 667MHz ECC Memory (CT12872AA667) and the system would not start - just post beeps.

The original memory is PC2-3200R ECC and the place I purchased the new RAM from does not have anything that low in speed. I figured the 5400 should be fine as usually they run at the lower speed.

Can I do something to make it work, or am I out of luck?

Searching online I have found a couple sites that are selling 5400 speed RAM specifically for it!

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I know this is a newb type question, but why the vote downs? –  Scott Szretter Jul 28 '11 at 17:01
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I didn't downvote, but: Hover over the vote down button and it tells you 'This question doesn't show any research effort; it is unclear or not useful'. With respect, I'd suggest that the first part of that statement could be used to describe this question. For a start, you mention crucial and their website offers a tool that tells you precisely what type of memory is needed for damn near all computers that major vendors like HP have produced. –  RobM Jul 30 '11 at 11:22
    
I understand, but that's the one thing about these sites I don't like -rather than a down vote, why not a meaningful, educational answer such as the one you just provided. I found the (incorrect) ram by searching google. From now on I might start with the crucial site. –  Scott Szretter Jul 30 '11 at 12:28

2 Answers 2

up vote 6 down vote accepted

You've bought unbuffered memory, not registered memory, that model won't run with unbuffered memory.

You should have bought Crucial P/N: CT820201.

Sorry.

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It could be that the ram arrived dead. this happened to me a few times.

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