至于AMD最新的上海核心,暂时还没有具体测试数据,估计需要四颗2.7GHz的才能达到两颗Xeon X5570的水平。
In a previous server oriented article, we summed up a rough profile of SAP S&D:
• Very parallel resulting in excellent scaling
• Low to medium IPC, mostly due to “branchy” code
• Not really limited by memory bandwidth
• Likes large caches
• Sensitive to Sync (“cache coherency”) latency
One of the biggest bottlenecks for Intel has been the sync latency. It is possible that once the "sync" bottleneck was removed, the intel architecture is able to show it's real integer crunching power thanks to the out of order loads (memory disambiguation) and better branch prediction.Those are two areas where the opteron architecture is still weak.
原帖由 Xcivic 于 2008-12-20 03:57 发表
确切的说, NEHALEM EP同时支持BUFFERED(REGISTER), UNBUFFERED两类内存. 主板都会采用COMBO ROUTING来同时支持这两类内存. 所以配置上要灵活不少. 如果对RAS有较高的要求就上RDIMM, 如果实在对成本有要求, 普通N ...

原帖由 acqwer 于 2008-12-17 09:30 发表
某小编:至于AMD最新的上海核心,暂时还没有具体测试数据,估计需要四颗2.7GHz的才能达到两颗Xeon X5570的水平。
:lol: :lol: :lol:

原帖由 Xcivic 于 2008-12-20 21:44 发表
不是啦, 我没有说BUFFER ONBOARD, 这个是用来取代FULLY BUFFERED DIMM的. 我说的重点是后面, 你看AMD限定只可以使用带REGISTER的RDIMM. 但是NEHALEM这一代, 你可以使用RDIMM/UDIMM, 算是减少用户TCO吧.
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