Both ram cards are ddr2, but not the same notch

April 24, 2012 at 18:41:12
Specs: Windows 7, ram
2 different ddr2 ram cards not the same? I'm not trying to mix different cards. I know the issues that can come out of that. What my question is I have 2 gigs (2 1gb) in my desktop now. And is not enough. A friend gave me a card to me (1 4gb). He told me when he gave it to me that it was a ddr3 and that made sense because when I took it home and tried to plug it in, it wouldn't fit. But...

After doing a little research on the ram card, everywhere says its a ddr2. ?? As far as I could find out the notch is so you cant mix ddr, ddr2, ddr3 in a uncompilable MB. But is there ddr2 ram chips that are different than other ddr2 chips??

It is racking my brain and I cant stop wanting to know the answer.

I'm new to the site :) Thanks for any help I can get.

Here are the specs of the card in question:

Samsung 4gb 2Rx4 PC2-5300-555-11-EO M395T5160QZ4-CE68 0841

If there is any other information that you need, let me know. Again, the cards that are in my PC now, say on the label DDR2, the Samsung just says the above information.

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April 24, 2012 at 19:05:13
It is possible that it is SODIMM which are for laptops. They are shorter.
Googling the full number brings up some that suggest that it is specifically Server Memory, but I understood (or thought I did) that servers just used ECC (error correcting) memory though I do not know if it has a different notch placement (possible).

You have to be a little bit crazy to keep you from going insane.

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April 24, 2012 at 21:34:56
you know what, I think you might be on to something. My friend IS using a server CASE with duel power supply for his pc. Not sure what else he has in it but i do remember that.

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April 25, 2012 at 05:18:21
All DDR2 is notched the same. ***NOTE: that comment was not accurate. See OtheHill's response about Fully Buffered DDR2***

And Laptop RAM is MUCH shorter than desktop RAM.

You mentioned that the RAM may have come from a server. If that's the case, it's probably ECC RAM. It's notched exactly the same as non-ECC DDR2, but it may not work in a standard desktop machine. Also, being that it's a 4GB stick, you'd have to confirm that your board accepts sticks that large. However, you should not mix ECC & non-ECC. One other thing to be aware of - ECC RAM is slower than non-ECC.

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April 25, 2012 at 06:35:00
Unbuffered and fully buffered DDR2 do not have the same notch placement. If a motherboard can use either then the slots are designed to accept either. If it can't then they won't fit. See the photos in the link below.

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April 25, 2012 at 08:10:30
"Unbuffered and fully buffered DDR2 do not have the same notch placement"

Interesting. I did not know that. I editted my other response.

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