64-bit Android smartphone might not come until later this year or in early 201555
The other problem revolves around the D-RAM market. Costs of producing mobile D-RAM memory has been on the rise and the Korean media is reporting that to produce the kind of D-RAM memory required to support a 64-bit mobile CPU, chip makers would be forced to revamp production lines. This would lead to delays and low yields (initially, at least). Prices would rise even further.
According to industry insiders, we could be looking at later this year or some time in 2015 before a 64-bit Android model is available.
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source: ETNews (translated) via GforGames