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I'm trying to figure out the difference between two ram chips. The KHX1600C9D3X2K2 and the KHX1600C9D3K2.

Official Specs: KHX1600C9D3X2K2 and KHX1600C9D3K2

There seems to be no difference at all between the two except for the extra X2 in the name of the first. I am asking because I am going to use one of them with an i7 3770k and ASUS P8Z77-V PRO.

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Yeah they are exactly the same as far as I can tell and both use XMP, so they should be up and running at 1600 CL9 as soon as you set the xmp profile. – Not Kyle stop stalking me Sep 11 '12 at 17:57
The x2 just reflects the color difference. – user142485 Sep 11 '12 at 18:28
probably reflects a different production run, only has meaning to kingston. Email or call Kingston and ask. – Moab Sep 12 '12 at 21:50

According to the PDFs with specs you provided they are exactly the same.

I suspect that the X2 is an indicated for kits with two modules in them.

This is based on my own memory shopping experiences. Back in the i7 920 time a lot of dual channel kits had X2 in their name, and triple channel kits had X3 in their name.

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The spec sheets both say 2 pcs. – user142485 Sep 11 '12 at 18:30
Aye. And the spec sheets themselves have different numbers. But electrically both sets should be identical. a few years ago the only difference between some modules and kits was that the kits where sold as tested in pairs. To fill 6 slots on a triple channel motherboard you could use three sets of X2, two sets of X3 and over 6 loose modules. And you could get the same modules, except for testing. – Hennes Sep 11 '12 at 18:39

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