Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am assembling a custom PC. And here are the components I ordered:

Motherboard: SuperMicro MBD-X8SIL-F-B -

Processor: Intel Xeon X3430

RAM: Crucial DDR3-1333 ECC RDIMM -

When I power on the system, the yellow led on the motherboard (marked as no. 43 on the manual) is blinking, and I hear a continuos long beep. According to the manual, this happens when the memory installed is unsupported.

Am I installing the wrong memory? If yes, what alternatives do I have. I want to keep this motherboard. I can switch the Processor or the RAM. But I do need at least 24 GBs of RAM.

Thanks in advance.

Update: worked like a charm :)

share|improve this question

migrated from Dec 31 '11 at 10:12

This question came from our site for system and network administrators.

How many memory modules? Are they all the same? Which slots are they in? – David Schwartz Dec 31 '11 at 1:47
up vote 1 down vote accepted

First, notice on the Crucial page that the memory is dual-rank DDR3 RDIMM. Then click on the link under memory capacity on the SuperMicro page. If you look in Table 2, the table for DDR3 ECC RDIMM support, under dual rank, it says "Up to 16GB". So you can't support 24GB with dual-rank RDIMMs.

If you need to support 24GB, your only option is quad-ranked, DDR3 ECC RDIMMs. Unfortunately, I've never heard of such a part in any density above 4GB (which would max you out at 16GB again). So I don't know how you could get to 24GB. Perhaps someone else does.

share|improve this answer
David, thanks for the response. Yea it makes sense now. Do you think these ( will work? – Gill Dec 31 '11 at 2:32
or these:… – Gill Dec 31 '11 at 2:37
Oh, wow, they do exist. I believe those will work, but I am not 100% sure. I know of no reason why they wouldn't. – David Schwartz Dec 31 '11 at 2:59

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.