You have a total of 4 instructions executed by each integer core.In 10h you had a total of 3(be it mem or math ops).That's a 33% difference.Now count in the massively improved prefetch and other stuff in the front end that are supposed to keep the core(s) busy all the time and you have a potentially pretty nice boost in IPC. Remember that with 10h ,the 3ALUs were paired with AGUs and sat around just waiting for data doing nothing. The new 2+2 scheme is built in order to address the under-utilization.





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