There is a big difference between them - rev 1.2 have microns D9s and the 2.1 have promos which dont o/c much at all! Here the ramlist to check
http://ramlist.ath.cx/ddr2/ and heres a review of the early revisions performance capabilities. http://www.xbitlabs.com/articles/mem...dr2-800_2.html
I know cos I bought a pair thinking I was getting great memory and ended up with the 2.1's.



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