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In page 3 GB barrier:
"This form of the 3 GB barrier affects one generation of MacBooks,[2] lasting 1 year (Core2Duo (Merom) – November 2006 to October 2007): the prior generation was limited to 2 GB, while later generations (November 2007 – October 2009) allowed 4 GB through the use of PAE and memory-hole remapping, and subsequent generations (late 2009 onwards) use 64-bit processors and therefore can address over 4 GB.
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