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I am trying to install 2 extra pairs of 2GB on my server, the motherboard is a GA-EP41-UD3L which is said to support up to 8GB and has 4 memory slots.

I have 4 memories of 2 GB being all of it:

  • DDR2
  • 1.80V
  • 5-5-5-18
  • 800MHz
  • Model: CM2X2048-6400C5

Once I plug it all, the board does 4 short beeps which entitles power failure by the manual information.

If I plug 2 of them at slots 1 and 3 it works just fine and detects 4GB, if I plug 3 of them on slots 1, 2 and 3 it boots up but does not detect the memory at slot 2.

Have also tried to set the bios to default before booting in.

  • What am I possible doing wrong here ?
  • Is this a motherboard problem ?
  • Memory problem ?
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up vote 1 down vote accepted

Are the memory modules single-sided?

Because of Intel chipset limitation, please use single-side memory module if four memory modules are to be installed.

From the Gigabyte support site (same info for both versions) here

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Tog what exactly would be single side ? All I know is that there are 4 slots and 4 equal memories. – Prix Dec 2 '11 at 21:21
The difference between dual and single sided is to do with how it is accessed on the module (not to be confused with dual channel). I can't find info on your memory on the Corsair site. Try sending their tech guys an email asking which type of memory you have – Tog Dec 2 '11 at 21:37
You may get away with boosting the voltage a little (try 1.9V first). If that doesn't work, try increasing the latencies a bit too. If your BIOS allows it, make sure to set the active-to-CMD latency (sometimes just called 'CMD' or 'command rate') to 2. Usually you can push one limit a little if you ease off a bit on the others. Make sure to test the configuration thoroughly with memtest86+ before booting any OS installation you care about. – David Schwartz Dec 2 '11 at 22:35
Tog thx will try to search about it and if I can't find anything mail them. David I would wish not to go out of the stock. – Prix Dec 3 '11 at 0:20

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