[請益] thunderbolt 4/5外接ssd實際速度?
由於mac mini出了thunderbolt5接口加上最近想買外接硬碟,做了一些關於usb/thundebolt功課,在個協議速度上有些疑問…
usb 3.2 gen2 : 理論值10Gbps,有些外接ssd(如美光x9)實測讀取1000MB/s
usb 3.2 gen2x2 : 理論值20Gbps,有些外接ssd(如三星t9)實際讀取2000MB/s
問題就來了
Thunderbolt4 / Usb 4:理論值可以跑40Gbps,照比例來看,應該實測讀取可以到4000MB/s,可是市面上不管是thunderbolt4 ssd外接盒或外接ssd,讀取實測都在2500-2600MB/s,少數到3000MB/s….
還有thunderbolt 5理論值為120Gbps,速度應該為thunderbolt 4的三倍,但目前唯一一顆thunderbolt 5 外接ssd (OWC Envoy Ultra ),標榜實測速度6000MB/s而已…
好奇速度快到後面的bottleneck是什麼? 是協議本身理論值就參考還是ssd本身?
感謝大家解惑
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跑不到理論值我理解,像usb3.2 2x2理論值可以跑到2500MB/s,實測2000MB/s。但好奇thumderbolt 4/5實測跟理論也差太多了...
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※ 編輯: chioushian (124.155.149.149 臺灣), 10/31/2024 17:38:29
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