在一連串的安全更新後,AMD 的 CPU 比 Intel 快了...

在「Intel Performance Hit 5x Harder Than AMD After Spectre, Meltdown Patches」這邊看到的測試:

把現有的安全性更新都開啟後,Intel CPU 的效能掉了 20% 左右 (在 Intel 上需要把 HT 關掉):

While the impacts vary tremendously from virtually nothing too significant on an application-by-application level, the collective whack is ~15-16 percent on all Intel CPUs without Hyper-Threading disabled. Disabling increases the overall performance impact to 20 percent (for the 7980XE), 24.8 percent (8700K) and 20.5 percent (6800K).

The AMD CPUs are not tested with HT disabled, because disabling SMT isn’t a required fix for the situation on AMD chips, but the cumulative impact of the decline is much smaller. AMD loses ~3 percent with all fixes enabled

可以注意到兩家目前桌機的頂規在上了安全性更新後,AMD 的 2990WX 比 Intel 的 7980XE 快了一些些... 當初擠牙膏擠出來的都吐回去了,不知道之後出的 security issue 還需要再吐多少回去。

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