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I want to upgrade RAM of my laptop, a Lenovo Ideapad Y510. The form factor of RAM given here is "SO DIMM 200-pin".

I have two options, first and second. My question is: both are of type DDR2 2GB 667MHz but the second one explicitly mentions "SO DIMM" while first does not.

Will the first one fit in my machine?

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Sorry but shopping recommendations are off topic here on SU. Please read the FAQ. – Diogo Jul 18 '12 at 13:20
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He is asking for shopping advice, but his real question is 'What is the difference between SO-DIMM and DIMM.' – user142485 Jul 18 '12 at 13:23
@Diogo: I am just want to know the difference between both of these ram so that I can go with correct one. – Sandy Jul 18 '12 at 13:27
@user142485: Thanks. That's what I actually mean. – Sandy Jul 18 '12 at 13:28
@Sandy You should make the edits so it does not sound like you are asking for shopping advice. – user142485 Jul 18 '12 at 13:30
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As far as I know, SODIMM is for laptop and DIMM is for desktop. Go with the SODIMM. The reason why there is a difference between RAM for laptop and desktop is electrical, heat and economcial.

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but if you see both listenings both rams are for laptops. – Sandy Jul 18 '12 at 13:30
@Sandy One says 'Laptop Ram' which is slang for small outline dimm like I said above. – user142485 Jul 18 '12 at 13:32
I have never seen a desktop using this type of RAM - maybe the new small form factor hard drives but they are designed for different reasons. Any way, this is now a shopping question so it's up to you. – Dave Rook Jul 18 '12 at 13:33
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The issue here is NOT one of trying to figure out the difference between the two RAM offering. The issue here is that both are eBay listings, and not subject to quality control as far as what the person selling the product actually types when they list the product.

Yes. Laptops use SO-DIMM memory. And... if you were to go by the pictures provided for both listings, then BOTH of the items are SO-DIMM, as they are both the same size (physically), have the notch in the same place, both made for laptops, etc.

If it's made for a laptop, it's SO-DIMM. If it's made for a laptop, this does not mean that the person listing the memory for sale is smart enough to add that (when it's not visible on the packaging).

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"If it's made for a laptop, it's SO-DIMM" if I am not interpreting your words wrong then you mean to say both are SO-DIMM. – Sandy Jul 18 '12 at 14:10
@Sandy you are correct. If the picture is real, and the seller is not trying to scam you, then they are both so-dimm – Bon Gart Jul 18 '12 at 17:30
up vote 1 down vote

SO stands for 'small outline' which is what is used in laptops (most, if not all) and some desktops (quite a few Macs). Try Wikipedia: http://en.wikipedia.org/wiki/SO-DIMM .

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