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The latest line of CPU - codename "Brisbane" - is AMD's first foray into 65 nm interconnect technology. AMD claims that the process shift does not affect performance, only power consumption is greatly reduced. However, there has been some controversy regarding the effects of the process shift on cache performance, especially the Level 2 cache appears to be severely affected with respect to access latencies.
Sometimes numbers don't add up and sometimes, even if they do they don't really paint a consistent picture. We looked at the "Brisbane" from the top, from the bottom, turned it left and right and finally we suspected that some benchmarks are flawed. If we are right, then there is a small increase in cache access latency which is in the order of approximately 10% or 2 cycles between the Windsor "F" revision and the Brisbane "G" Rev. That's really all we can let out here, but there is more in the rest of the article.
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