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So I pulled out this weirdo SODIMM RAM stick from a Compaq laptop, and much to my suprise it's slit is at a little different point, and so it does not fit into our other Dell laptops.

Is it a different type? What's going on here?

enter image description here

And if you want a close-up look at the 2 RAM sticks:

enter image description here

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Can you post the model numbers of each laptop? – Zds Sep 18 '11 at 12:13
up vote 10 down vote accepted

From a quick peek at wikipedia, i'd guess the regular ram is DDR 2 and the other is DDR1 - it seems to match up with the big SVG (linked below) on the page

Incredibly useful diagram showing pinouts

enter image description here

SVG version here if you need it bigger showing the pin positions for being sure. - its an SVG so i can't link it directly. Also, the notch on the ram is always on the same side - count the number of pins to be sure.

The systems are probably from different generations and just happen to use utterly incompatable forms of standard ram. It would be easy to check from an OS - using LSHW in linux or WMIC or a front end to that in windows

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