AMD has announced that it has revised its plan to ramp-up production [and subsequent availability] of the quad-core Barcelona chips from Q4 of 2007 to Q1 of 2008. In October, they stated that Barcelona silicon would be “widely available” by the end of the year.
There has been widespread speculation that the major delay in rollout is due to an erratum in the translation lookaside buffer [TLB]. The issue was made public by AMD some time ago and can be fixed with a BIOS update, but at the supposed cost of 10-20% of performance.
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