官網標準配備的速度是2400MHz,目前主流 DDR4 2400 和 2666 價差極小,在購買時我挑了較快時脈的Crucial – Micron美光 Ballistix 2666 8GB兩條,原本是想換裝到 Intel 6代 NUC i7 上,不過不支援所以無法開機,就拿到iMac 5K 2017上使用。(原本只安裝一條美光 2400 16GB)

開機沒有問題,運作正常,不過速度顯示只有 2400MHz。國外網友說實際上確實是跑2666的速度。

Testing with a 2017 iMac, thought i’d see if it’d take 2666mhz sticks and assumed it would and clock them down to the 2400 standard Apple advertises and sells, instead, it actually runs them at 2666 (reported as 2667mhz in macOS as it likes to round things up)

dannys1

Update: 2018-07-25
今天新購兩條美光 DDR4-2666 16GB,裝上去系統可以顯示為2667MHz,先前買的Micron Ballistix Sport LT NB-D4 2666 8GB就只能顯示2400MHz,挺奇怪的!?

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