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you're going to want to look at laptop modules that is equivalent to the frequency it was shipped with.
 
How can you tell? I mean, other than looking at the photo.

"100% Tested and Verified on Intel P55 chipset" - P55 is a desktop chipset.

240-pin DDR3 is desktop, 204-pin DDR3 is laptop. Plus, the picture gave it away.
 
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