Gen 4 SSD on Gen 3 slots
 
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Gen 4 SSD on Gen 3 slots  

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yesornofei
(@yesornofei)
Active Member
Joined: 2 years ago
 

Hi, I have a 2018 Mac mini and a Thunderbolt3 NVME SSD enclosure,

I notice that the Gen 4 NVME SSD is getting cheaper and cheaper, I was wondering if one day some Gen 4 NVME SSDs will be cheaper than some of the expensive models of Gen 3 SSD(Samsung 970 Pro for example),

and did anyone test how the speed decrease in Gen3 slot(in my case, a thunderbolt 3 enclosure)

let 5GB/s be the GEN4 SSD read speed, what speed will it be in a GEN3 slot?

will it be the Max speed of gen3 which is about 3.5GB/s, or will it be 2.5GB/s because the bandwidth is half-off?

Did anybody tried and know the real answer?

This topic was modified 6 days ago

mac mini 2018 i7 egpu with RX580


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itsage
(@itsage)
Illustrious Member Admin
Joined: 4 years ago
 

@yesornofei, Thunderbolt 3 bandwidth throughput is capped at 22Gbps. PCIe 4.0 NVMe drives in a TB3 enclosure work but they don't go faster than this cap.

 

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yesornofei
(@yesornofei)
Active Member
Joined: 2 years ago
 

@itsage, Thanks, I will avoid the expensive 3500MB read speed NVME SSD to save some money, as only 22Gbps=2750 MB/s is capped by Thunderbolt 3.

 

mac mini 2018 i7 egpu with RX580


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