AMD'S AM2 socket will "evolve" to AM2+ in Q3 2007. The AM2+ will include support for the latest greatest Hypertransport 3, scoring with 4.0 to 4.4 GT/s where the exact speed depends on the north bridge frequency.
The AM2+ CPUs are backward compatible with the existing AM2 CPUs and even the new AM2+ CPUs scheduled for 2007 announcement should work in the previous boards, but not at full speed. They will have to depend on HT 2 not on HT 3 and even today's CPUs will work on future AM2+ platforms
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News source: The Inq
